some more backend coverage

[ci skip]

.devcontainer/Dockerfile

@@ -64,6 +64,8 @@ ARG RUNTIME_PACKAGES="\
   libmagic1 \
   media-types \
   zlib1g \
+  # Barcode splitter
+  libzbar0 \
   poppler-utils \
   htop \
   sudo"

.github/dependabot.yml

@@ -69,6 +69,7 @@ updates:
         patterns:
           - "ocrmypdf"
           - "pdf2image"
+          - "pyzbar"
           - "zxing-cpp"
           - "tika-client"
           - "gotenberg-client"

.github/workflows/ci-backend.yml

@@ -55,7 +55,7 @@ jobs:
         run: |
           sudo apt-get update -qq
           sudo apt-get install -qq --no-install-recommends \
-            unpaper tesseract-ocr imagemagick ghostscript poppler-utils
+            unpaper tesseract-ocr imagemagick ghostscript libzbar0 poppler-utils
       - name: Configure ImageMagick
         run: |
           sudo cp docker/rootfs/etc/ImageMagick-6/paperless-policy.xml /etc/ImageMagick-6/policy.xml

.github/workflows/ci-docs.yml

@@ -26,8 +26,8 @@ permissions:
   pages: write
   id-token: write
 env:
-  DEFAULT_UV_VERSION: "0.10.x"
-  DEFAULT_PYTHON_VERSION: "3.12"
+  DEFAULT_UV_VERSION: "0.9.x"
+  DEFAULT_PYTHON_VERSION: "3.11"
 jobs:
   build:
     name: Build Documentation

.github/workflows/ci-release.yml

@@ -8,8 +8,8 @@ concurrency:
   group: release-${{ github.ref }}
   cancel-in-progress: false
 env:
-  DEFAULT_UV_VERSION: "0.10.x"
-  DEFAULT_PYTHON_VERSION: "3.12"
+  DEFAULT_UV_VERSION: "0.9.x"
+  DEFAULT_PYTHON_VERSION: "3.11"
 jobs:
   wait-for-docker:
     name: Wait for Docker Build

.mypy-baseline.txt

@@ -20,6 +20,7 @@ src/documents/admin.py:0: error: Skipping analyzing "auditlog.models": module is
 src/documents/admin.py:0: error: Skipping analyzing "treenode.admin": module is installed, but missing library stubs or py.typed marker  [import-untyped]
 src/documents/barcodes.py:0: error: "Image" has no attribute "filename"  [attr-defined]
 src/documents/barcodes.py:0: error: Cannot find implementation or library stub for module named "zxingcpp"  [import-not-found]
+src/documents/barcodes.py:0: error: Skipping analyzing "pyzbar": module is installed, but missing library stubs or py.typed marker  [import-untyped]
 src/documents/bulk_download.py:0: error: Return type "None" of "add_document" incompatible with return type "Never" in supertype "BulkArchiveStrategy"  [override]
 src/documents/bulk_download.py:0: error: Return type "None" of "add_document" incompatible with return type "Never" in supertype "BulkArchiveStrategy"  [override]
 src/documents/bulk_download.py:0: error: Return type "None" of "add_document" incompatible with return type "Never" in supertype "BulkArchiveStrategy"  [override]
@@ -98,7 +99,6 @@ src/documents/conditionals.py:0: error: Function is missing a type annotation fo
 src/documents/conditionals.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/conditionals.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/consumer.py:0: error: "ConsumerPluginMixin" has no attribute "input_doc"  [attr-defined]
-src/documents/consumer.py:0: error: "ConsumerPluginMixin" has no attribute "log"  [attr-defined]
 src/documents/consumer.py:0: error: "ConsumerPluginMixin" has no attribute "metadata"  [attr-defined]
 src/documents/consumer.py:0: error: "ConsumerPluginMixin" has no attribute "metadata"  [attr-defined]
 src/documents/consumer.py:0: error: "ConsumerPluginMixin" has no attribute "metadata"  [attr-defined]
@@ -345,18 +345,11 @@ src/documents/migrations/0001_initial.py:0: error: Skipping analyzing "multisele
 src/documents/migrations/0008_sharelinkbundle.py:0: error: Function is missing a type annotation  [no-untyped-def]
 src/documents/migrations/0008_sharelinkbundle.py:0: error: Function is missing a type annotation  [no-untyped-def]
 src/documents/models.py:0: error: Argument 1 to "Path" has incompatible type "Path | None"; expected "str | PathLike[str]"  [arg-type]
-src/documents/models.py:0: error: Could not resolve manager type for "documents.models.Document.deleted_objects"  [django-manager-missing]
-src/documents/models.py:0: error: Could not resolve manager type for "documents.models.Document.global_objects"  [django-manager-missing]
-src/documents/models.py:0: error: Could not resolve manager type for "documents.models.Document.objects"  [django-manager-missing]
-src/documents/models.py:0: error: Couldn't resolve related manager 'custom_fields' for relation 'documents.models.CustomFieldInstance.document'.  [django-manager-missing]
 src/documents/models.py:0: error: Couldn't resolve related manager 'documents' for relation 'documents.models.Document.correspondent'.  [django-manager-missing]
 src/documents/models.py:0: error: Couldn't resolve related manager 'documents' for relation 'documents.models.Document.document_type'.  [django-manager-missing]
 src/documents/models.py:0: error: Couldn't resolve related manager 'documents' for relation 'documents.models.Document.storage_path'.  [django-manager-missing]
 src/documents/models.py:0: error: Couldn't resolve related manager 'fields' for relation 'documents.models.CustomFieldInstance.field'.  [django-manager-missing]
-src/documents/models.py:0: error: Couldn't resolve related manager 'notes' for relation 'documents.models.Note.document'.  [django-manager-missing]
 src/documents/models.py:0: error: Couldn't resolve related manager 'runs' for relation 'documents.models.WorkflowRun.workflow'.  [django-manager-missing]
-src/documents/models.py:0: error: Couldn't resolve related manager 'share_links' for relation 'documents.models.ShareLink.document'.  [django-manager-missing]
-src/documents/models.py:0: error: Couldn't resolve related manager 'workflow_runs' for relation 'documents.models.WorkflowRun.document'.  [django-manager-missing]
 src/documents/models.py:0: error: Function is missing a return type annotation  [no-untyped-def]
 src/documents/models.py:0: error: Function is missing a return type annotation  [no-untyped-def]
 src/documents/models.py:0: error: Function is missing a return type annotation  [no-untyped-def]
@@ -983,10 +976,6 @@ src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annot
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation  [no-untyped-def]
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation  [no-untyped-def]
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation  [no-untyped-def]
-src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation  [no-untyped-def]
-src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
-src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
-src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/tests/test_bulk_edit.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
@@ -1012,7 +1001,6 @@ src/documents/tests/test_bulk_edit.py:0: error: Item "dict[Any, Any]" of "Group
 src/documents/tests/test_bulk_edit.py:0: error: Item "dict[Any, Any]" of "Group | dict[Any, Any]" has no attribute "count"  [union-attr]
 src/documents/tests/test_bulk_edit.py:0: error: Too few arguments for "count" of "list"  [call-arg]
 src/documents/tests/test_bulk_edit.py:0: error: Too few arguments for "count" of "list"  [call-arg]
-src/documents/tests/test_bulk_edit.py:0: error: Unsupported operand types for - ("None" and "int")  [operator]
 src/documents/tests/test_caching.py:0: error: Function is missing a type annotation for one or more arguments  [no-untyped-def]
 src/documents/tests/test_classifier.py:0: error: "None" has no attribute "classes_"  [attr-defined]
 src/documents/tests/test_classifier.py:0: error: "None" has no attribute "classes_"  [attr-defined]

Dockerfile

@@ -154,6 +154,8 @@ ARG RUNTIME_PACKAGES="\
   libmagic1 \
   media-types \
   zlib1g \
+  # Barcode splitter
+  libzbar0 \
   poppler-utils"
 
 # Install basic runtime packages.

docs/advanced_usage.md

@@ -774,6 +774,7 @@ At this time, the library utilized for detection of barcodes supports the follow
 -   QR Code
 -   SQ Code
 
+You may check for updates on the [zbar library homepage](https://github.com/mchehab/zbar).
 For usage in Paperless, the type of barcode does not matter, only the contents of it.
 
 For how to enable barcode usage, see [the configuration](configuration.md#barcodes).

docs/configuration.md

@@ -1222,6 +1222,14 @@ using Python's `re.match()`, which anchors at the start of the filename.
 
     The default ignores are `[.stfolder, .stversions, .localized, @eaDir, .Spotlight-V100, .Trashes, __MACOSX]` and cannot be overridden.
 
+#### [`PAPERLESS_CONSUMER_BARCODE_SCANNER=<string>`](#PAPERLESS_CONSUMER_BARCODE_SCANNER) {#PAPERLESS_CONSUMER_BARCODE_SCANNER}
+
+: Sets the barcode scanner used for barcode functionality.
+
+    Currently, "PYZBAR" (the default) or "ZXING" might be selected.
+    If you have problems that your Barcodes/QR-Codes are not detected
+    (especially with bad scan quality and/or small codes), try the other one.
+
 #### [`PAPERLESS_PRE_CONSUME_SCRIPT=<filename>`](#PAPERLESS_PRE_CONSUME_SCRIPT) {#PAPERLESS_PRE_CONSUME_SCRIPT}
 
 : After some initial validation, Paperless can trigger an arbitrary

docs/migration.md

@@ -23,28 +23,3 @@ separating the directory ignore from the file ignore.
 Document and thumbnail encryption is no longer supported. This was previously deprecated in [paperless-ng 0.9.3](https://github.com/paperless-ngx/paperless-ngx/blob/dev/docs/changelog.md#paperless-ng-093)
 
 Users must decrypt their document using the `decrypt_documents` command before upgrading.
-
-## Barcode Scanner Changes
-
-Support for [pyzbar](https://github.com/NaturalHistoryMuseum/pyzbar) has been removed. The underlying libzbar library has
-seen no updates in 16 years and is largely unmaintained, and the pyzbar Python wrapper last saw a release in March 2022. In
-practice, pyzbar struggled with barcode detection reliability, particularly on skewed, low-contrast, or partially
-obscured barcodes. [zxing-cpp](https://github.com/zxing-cpp/zxing-cpp) is actively maintained, significantly more
-reliable at finding barcodes, and now ships pre-built wheels for both x86_64 and arm64, removing the need to build the library.
-
-The `CONSUMER_BARCODE_SCANNER` setting has been removed. zxing-cpp is now the only backend.
-
-### Summary
-
-| Old Setting                | New Setting | Notes                             |
-| -------------------------- | ----------- | --------------------------------- |
-| `CONSUMER_BARCODE_SCANNER` | _Removed_   | zxing-cpp is now the only backend |
-
-### Action Required
-
--   If you were already using `CONSUMER_BARCODE_SCANNER=ZXING`, simply remove the setting.
--   If you had `CONSUMER_BARCODE_SCANNER=PYZBAR` or were using the default, no functional changes are needed beyond
-    removing the setting. zxing-cpp supports all the same barcode formats and you should see improved detection
-    reliability.
--   The `libzbar0` / `libzbar-dev` system packages are no longer required and can be removed from any custom Docker
-    images or host installations.

docs/setup.md

@@ -207,12 +207,13 @@ are released, dependency support is confirmed, etc.
     -   `libpq-dev` for PostgreSQL
     -   `libmagic-dev` for mime type detection
     -   `mariadb-client` for MariaDB compile time
+    -   `libzbar0` for barcode detection
     -   `poppler-utils` for barcode detection
 
     Use this list for your preferred package management:
 
     ```
-    python3 python3-pip python3-dev imagemagick fonts-liberation gnupg libpq-dev default-libmysqlclient-dev pkg-config libmagic-dev poppler-utils
+    python3 python3-pip python3-dev imagemagick fonts-liberation gnupg libpq-dev default-libmysqlclient-dev pkg-config libmagic-dev libzbar0 poppler-utils
     ```
 
     These dependencies are required for OCRmyPDF, which is used for text

pyproject.toml

@@ -68,6 +68,7 @@ dependencies = [
   "python-gnupg~=0.5.4",
   "python-ipware~=3.0.0",
   "python-magic~=0.4.27",
+  "pyzbar~=0.1.9",
   "rapidfuzz~=3.14.0",
   "redis[hiredis]~=5.2.1",
   "regex>=2025.9.18",
@@ -80,7 +81,7 @@ dependencies = [
   "watchfiles>=1.1.1",
   "whitenoise~=6.11",
   "whoosh-reloaded>=2.7.5",
-  "zxing-cpp~=3.0.0",
+  "zxing-cpp~=2.3.0",
 ]
 
 optional-dependencies.mariadb = [
@@ -171,6 +172,10 @@ psycopg-c = [
   { url = "https://github.com/paperless-ngx/builder/releases/download/psycopg-trixie-3.3.0/psycopg_c-3.3.0-cp312-cp312-linux_x86_64.whl", marker = "sys_platform == 'linux' and platform_machine == 'x86_64' and python_version == '3.12'" },
   { url = "https://github.com/paperless-ngx/builder/releases/download/psycopg-trixie-3.3.0/psycopg_c-3.3.0-cp312-cp312-linux_aarch64.whl", marker = "sys_platform == 'linux' and platform_machine == 'aarch64' and python_version == '3.12'" },
 ]
+zxing-cpp = [
+  { url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_x86_64.whl", marker = "sys_platform == 'linux' and platform_machine == 'x86_64' and python_version == '3.12'" },
+  { url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_aarch64.whl", marker = "sys_platform == 'linux' and platform_machine == 'aarch64' and python_version == '3.12'" },
+]
 
 torch = [
   { index = "pytorch-cpu" },

src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.spec.ts

@@ -65,6 +65,13 @@ describe('PngxPdfViewerComponent', () => {
     const pageSpy = jest.fn()
     component.pageChange.subscribe(pageSpy)
 
+    // In real usage the viewer may have multiple pages; our pdfjs mock defaults
+    // to a single page, so explicitly simulate a multi-page document here.
+    const pdf = (component as any).pdf as { numPages: number }
+    pdf.numPages = 3
+    const viewer = (component as any).pdfViewer as PDFViewer
+    viewer.setDocument(pdf)
+
     component.zoomScale = PdfZoomScale.PageFit
     component.zoom = PdfZoomLevel.Two
     component.rotation = 90
@@ -81,7 +88,6 @@ describe('PngxPdfViewerComponent', () => {
       page: new SimpleChange(undefined, 2, false),
     })
 
-    const viewer = (component as any).pdfViewer as PDFViewer
     expect(viewer.pagesRotation).toBe(90)
     expect(viewer.currentPageNumber).toBe(2)
     expect(pageSpy).toHaveBeenCalledWith(2)
@@ -196,6 +202,8 @@ describe('PngxPdfViewerComponent', () => {
     const scaleSpy = jest.spyOn(component as any, 'applyViewerState')
     const resizeSpy = jest.spyOn(component as any, 'setupResizeObserver')
 
+    // Angular sets the input value before calling ngOnChanges; mirror that here.
+    component.src = 'test.pdf'
     component.ngOnChanges({
       src: new SimpleChange(undefined, 'test.pdf', true),
       zoomScale: new SimpleChange(

src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.ts

@@ -81,7 +81,7 @@ export class PngxPdfViewerComponent
     this.dispatchFindIfReady()
     this.rendered.emit()
   }
-  private readonly onPagesInit = () => this.applyScale()
+  private readonly onPagesInit = () => this.applyViewerState()
   private readonly onPageChanging = (evt: { pageNumber: number }) => {
     // Avoid [(page)] two-way binding re-triggers navigation
     this.lastViewerPage = evt.pageNumber
@@ -90,8 +90,10 @@ export class PngxPdfViewerComponent
 
   ngOnChanges(changes: SimpleChanges): void {
     if (changes['src']) {
-      this.hasLoaded = false
+      this.resetViewerState()
+      if (this.src) {
         this.loadDocument()
+      }
       return
     }
 
@@ -139,6 +141,21 @@ export class PngxPdfViewerComponent
     this.pdfViewer = undefined
   }
 
+  private resetViewerState(): void {
+    this.hasLoaded = false
+    this.hasRenderedPage = false
+    this.lastFindQuery = ''
+    this.lastViewerPage = undefined
+    this.loadingTask?.destroy()
+    this.loadingTask = undefined
+    this.pdf = undefined
+    this.linkService.setDocument(null)
+    if (this.pdfViewer) {
+      this.pdfViewer.setDocument(null)
+      this.pdfViewer.currentPageNumber = 1
+    }
+  }
+
   private async loadDocument(): Promise<void> {
     if (this.hasLoaded) {
       return
@@ -222,7 +239,11 @@ export class PngxPdfViewerComponent
       hasPages &&
       this.page !== this.lastViewerPage
     ) {
-      this.pdfViewer.currentPageNumber = this.page
+      const nextPage = Math.min(
+        Math.max(Math.trunc(this.page), 1),
+        this.pdfViewer.pagesCount
+      )
+      this.pdfViewer.currentPageNumber = nextPage
     }
     if (this.page === this.lastViewerPage) {
       this.lastViewerPage = undefined

src-ui/src/app/components/document-detail/document-detail.component.html

@@ -1,7 +1,7 @@
 <pngx-page-header [(title)]="title" [id]="documentId">
   @if (archiveContentRenderType === ContentRenderType.PDF && !useNativePdfViewer) {
     @if (previewNumPages) {
-      <div class="input-group input-group-sm d-none d-md-flex">
+      <div class="input-group input-group-sm ms-2 d-none d-md-flex">
         <div class="input-group-text" i18n>Page</div>
           <input class="form-control flex-grow-0 w-auto" type="number" min="1" [max]="previewNumPages" [(ngModel)]="previewCurrentPage" />
         <div class="input-group-text" i18n>of {{previewNumPages}}</div>
@@ -24,6 +24,88 @@
     <i-bs width="1.2em" height="1.2em" name="trash"></i-bs><span class="d-none d-lg-inline ps-1" i18n>Delete</span>
   </button>
 
+  @if (document?.versions?.length > 0) {
+    <div class="btn-group" ngbDropdown autoClose="outside">
+      <button class="btn btn-sm btn-outline-secondary dropdown-toggle" ngbDropdownToggle>
+        <i-bs name="file-earmark-diff"></i-bs>
+        <span class="d-none d-lg-inline ps-1" i18n>Versions</span>
+      </button>
+      <div class="dropdown-menu shadow" ngbDropdownMenu>
+        <div class="px-3 py-2">
+          @if (versionUploadState === UploadState.Idle) {
+            <div class="input-group input-group-sm mb-2">
+              <span class="input-group-text" i18n>Label</span>
+              <input class="form-control" type="text" [(ngModel)]="newVersionLabel" i18n-placeholder placeholder="Optional" [disabled]="!userIsOwner || !userCanEdit" />
+            </div>
+            <input #versionFileInput type="file" class="visually-hidden" (change)="onVersionFileSelected($event)" />
+            <button class="btn btn-sm btn-outline-secondary w-100" (click)="versionFileInput.click()" [disabled]="!userIsOwner || !userCanEdit">
+              <i-bs name="file-earmark-plus"></i-bs><span class="ps-1" i18n>Add new version</span>
+            </button>
+          } @else {
+            @switch (versionUploadState) {
+              @case (UploadState.Uploading) {
+                <div class="small text-muted mt-1 d-flex align-items-center">
+                  <output class="spinner-border spinner-border-sm me-2" aria-hidden="true"></output>
+                  <span i18n>Uploading version...</span>
+                </div>
+              }
+              @case (UploadState.Processing) {
+                <div class="small text-muted mt-1 d-flex align-items-center">
+                  <output class="spinner-border spinner-border-sm me-2" aria-hidden="true"></output>
+                  <span i18n>Processing version...</span>
+                </div>
+              }
+              @case (UploadState.Failed) {
+                <div class="small text-danger mt-1 d-flex align-items-center justify-content-between">
+                  <span i18n>Version upload failed.</span>
+                  <button type="button" class="btn btn-link btn-sm p-0 ms-2" (click)="clearVersionUploadStatus()" i18n>Dismiss</button>
+                </div>
+                @if (versionUploadError) {
+                  <div class="small text-muted mt-1">{{ versionUploadError }}</div>
+                }
+              }
+            }
+          }
+        </div>
+        <div class="dropdown-divider"></div>
+        @for (version of document.versions; track version.id) {
+          <div class="dropdown-item">
+            <div class="d-flex align-items-center w-100 version-item">
+              <span class="badge bg-light text-lowercase text-muted">
+                {{ version.checksum | slice:0:8 }}
+              </span>
+              <button type="button" class="btn btn-link link-underline link-underline-opacity-0 flex-grow-1 ms-3 small text-start" (click)="selectVersion(version.id)">
+                <div class="small">
+                  @if (version.version_label) {
+                    {{ version.version_label }}
+                  } @else {
+                    <span i18n>ID</span> #{{version.id}}
+                  }
+                </div>
+                <div class="version-subtitle text-muted">
+                  {{ version.added | customDate:'short' }}
+                </div>
+              </button>
+              @if (selectedVersionId === version.id) { <span class="ms-2">✓</span> }
+              @if (!version.is_root) {
+                <pngx-confirm-button
+                  buttonClasses="btn-link btn-sm text-danger ms-2"
+                  iconName="trash"
+                  confirmMessage="Delete this version?"
+                  i18n-confirmMessage
+                  [disabled]="!userIsOwner || !userCanEdit"
+                  (confirm)="deleteVersion(version.id)"
+                >
+                  <span class="visually-hidden" i18n>Delete version</span>
+                </pngx-confirm-button>
+              }
+            </div>
+          </div>
+        }
+      </div>
+    </div>
+  }
+
   <div class="btn-group">
     <button (click)="download()" class="btn btn-sm btn-outline-primary" [disabled]="downloading">
       @if (downloading) {
@@ -457,7 +539,7 @@
         @if (!useNativePdfViewer) {
           <div class="preview-sticky pdf-viewer-container">
             <pngx-pdf-viewer
-              [src]="{ url: previewUrl, password: password }"
+              [src]="pdfSource"
               [renderMode]="PdfRenderMode.All"
               [(page)]="previewCurrentPage"
               [zoomScale]="previewZoomScale"

src-ui/src/app/components/document-detail/document-detail.component.spec.ts

@@ -30,7 +30,7 @@ import {
 } from '@ng-bootstrap/ng-bootstrap'
 import { NgxBootstrapIconsModule, allIcons } from 'ngx-bootstrap-icons'
 import { DeviceDetectorService } from 'ngx-device-detector'
-import { of, throwError } from 'rxjs'
+import { Subject, of, throwError } from 'rxjs'
 import { routes } from 'src/app/app-routing.module'
 import { Correspondent } from 'src/app/data/correspondent'
 import { CustomFieldDataType } from 'src/app/data/custom-field'
@@ -65,6 +65,10 @@ import { TagService } from 'src/app/services/rest/tag.service'
 import { UserService } from 'src/app/services/rest/user.service'
 import { SettingsService } from 'src/app/services/settings.service'
 import { ToastService } from 'src/app/services/toast.service'
+import {
+  UploadState,
+  WebsocketStatusService,
+} from 'src/app/services/websocket-status.service'
 import { environment } from 'src/environments/environment'
 import { ConfirmDialogComponent } from '../common/confirm-dialog/confirm-dialog.component'
 import { PasswordRemovalConfirmDialogComponent } from '../common/confirm-dialog/password-removal-confirm-dialog/password-removal-confirm-dialog.component'
@@ -127,6 +131,24 @@ const customFields = [
   },
 ]
 
+function createFileInput(file?: File) {
+  const input = document.createElement('input')
+  input.type = 'file'
+  const files = file
+    ? ({
+        0: file,
+        length: 1,
+        item: () => file,
+      } as unknown as FileList)
+    : ({
+        length: 0,
+        item: () => null,
+      } as unknown as FileList)
+  Object.defineProperty(input, 'files', { value: files })
+  input.value = ''
+  return input
+}
+
 describe('DocumentDetailComponent', () => {
   let component: DocumentDetailComponent
   let fixture: ComponentFixture<DocumentDetailComponent>
@@ -142,6 +164,7 @@ describe('DocumentDetailComponent', () => {
   let deviceDetectorService: DeviceDetectorService
   let httpTestingController: HttpTestingController
   let componentRouterService: ComponentRouterService
+  let websocketStatusService: WebsocketStatusService
 
   let currentUserCan = true
   let currentUserHasObjectPermissions = true
@@ -291,6 +314,7 @@ describe('DocumentDetailComponent', () => {
     fixture = TestBed.createComponent(DocumentDetailComponent)
     httpTestingController = TestBed.inject(HttpTestingController)
     componentRouterService = TestBed.inject(ComponentRouterService)
+    websocketStatusService = TestBed.inject(WebsocketStatusService)
     component = fixture.componentInstance
   })
 
@@ -354,6 +378,88 @@ describe('DocumentDetailComponent', () => {
     expect(component.document).toEqual(doc)
   })
 
+  it('should redirect to root when opening a version document id', () => {
+    const navigateSpy = jest.spyOn(router, 'navigate')
+    jest
+      .spyOn(activatedRoute, 'paramMap', 'get')
+      .mockReturnValue(of(convertToParamMap({ id: 10, section: 'details' })))
+    jest
+      .spyOn(documentService, 'get')
+      .mockReturnValueOnce(throwError(() => ({ status: 404 }) as any))
+    const getRootSpy = jest
+      .spyOn(documentService, 'getRootId')
+      .mockReturnValue(of({ root_id: 3 }))
+    jest.spyOn(openDocumentsService, 'getOpenDocument').mockReturnValue(null)
+    jest
+      .spyOn(openDocumentsService, 'openDocument')
+      .mockReturnValueOnce(of(true))
+    jest.spyOn(customFieldsService, 'listAll').mockReturnValue(
+      of({
+        count: customFields.length,
+        all: customFields.map((f) => f.id),
+        results: customFields,
+      })
+    )
+
+    fixture.detectChanges()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+
+    expect(getRootSpy).toHaveBeenCalledWith(10)
+    expect(navigateSpy).toHaveBeenCalledWith(['documents', 3, 'details'], {
+      replaceUrl: true,
+    })
+  })
+
+  it('should not render a delete button for the root/original version', () => {
+    const docWithVersions = {
+      ...doc,
+      versions: [
+        {
+          id: doc.id,
+          added: new Date('2024-01-01T00:00:00Z'),
+          version_label: 'Original',
+          checksum: 'aaaa',
+          is_root: true,
+        },
+        {
+          id: 10,
+          added: new Date('2024-01-02T00:00:00Z'),
+          version_label: 'Edited',
+          checksum: 'bbbb',
+          is_root: false,
+        },
+      ],
+    } as Document
+
+    jest
+      .spyOn(activatedRoute, 'paramMap', 'get')
+      .mockReturnValue(of(convertToParamMap({ id: 3, section: 'details' })))
+    jest.spyOn(documentService, 'get').mockReturnValueOnce(of(docWithVersions))
+    jest
+      .spyOn(documentService, 'getMetadata')
+      .mockReturnValue(of({ has_archive_version: true } as any))
+    jest.spyOn(openDocumentsService, 'getOpenDocument').mockReturnValue(null)
+    jest
+      .spyOn(openDocumentsService, 'openDocument')
+      .mockReturnValueOnce(of(true))
+    jest.spyOn(customFieldsService, 'listAll').mockReturnValue(
+      of({
+        count: customFields.length,
+        all: customFields.map((f) => f.id),
+        results: customFields,
+      })
+    )
+
+    fixture.detectChanges()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+    fixture.detectChanges()
+
+    const deleteButtons = fixture.debugElement.queryAll(
+      By.css('pngx-confirm-button')
+    )
+    expect(deleteButtons.length).toEqual(1)
+  })
+
   it('should fall back to details tab when duplicates tab is active but no duplicates', () => {
     initNormally()
     component.activeNavID = component.DocumentDetailNavIDs.Duplicates
@@ -1441,6 +1547,185 @@ describe('DocumentDetailComponent', () => {
     expect(closeSpy).toHaveBeenCalled()
   })
 
+  it('selectVersion should update preview and handle preview failures', () => {
+    const previewSpy = jest.spyOn(documentService, 'getPreviewUrl')
+    initNormally()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+
+    previewSpy.mockReturnValueOnce('preview-version')
+    jest.spyOn(documentService, 'getThumbUrl').mockReturnValue('thumb-version')
+
+    component.selectVersion(10)
+    httpTestingController.expectOne('preview-version').flush('version text')
+
+    expect(component.previewUrl).toBe('preview-version')
+    expect(component.thumbUrl).toBe('thumb-version')
+    expect(component.previewText).toBe('version text')
+    const pdfSource = component.pdfSource as { url: string; password?: string }
+    expect(pdfSource.url).toBe('preview-version')
+    expect(pdfSource.password).toBeUndefined()
+
+    previewSpy.mockReturnValueOnce('preview-error')
+    component.selectVersion(11)
+    httpTestingController
+      .expectOne('preview-error')
+      .error(new ErrorEvent('fail'))
+
+    expect(component.previewText).toContain('An error occurred loading content')
+  })
+
+  it('deleteVersion should update versions, fall back, and surface errors', () => {
+    initNormally()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+
+    component.document.versions = [
+      {
+        id: 3,
+        added: new Date(),
+        version_label: 'Original',
+        checksum: 'aaaa',
+        is_root: true,
+      },
+      {
+        id: 10,
+        added: new Date(),
+        version_label: 'Edited',
+        checksum: 'bbbb',
+        is_root: false,
+      },
+    ]
+    component.selectedVersionId = 10
+
+    const openDoc = { ...doc, versions: [] } as Document
+    jest.spyOn(openDocumentsService, 'getOpenDocument').mockReturnValue(openDoc)
+    const saveSpy = jest.spyOn(openDocumentsService, 'save')
+    const deleteSpy = jest.spyOn(documentService, 'deleteVersion')
+    const versionsSpy = jest.spyOn(documentService, 'getVersions')
+    const selectSpy = jest
+      .spyOn(component, 'selectVersion')
+      .mockImplementation(() => {})
+    const errorSpy = jest.spyOn(toastService, 'showError')
+
+    deleteSpy.mockReturnValueOnce(of({ result: 'ok', current_version_id: 99 }))
+    versionsSpy.mockReturnValueOnce(
+      of({ id: doc.id, versions: [{ id: 99, is_root: false }] } as Document)
+    )
+    component.deleteVersion(10)
+
+    expect(component.document.versions).toEqual([{ id: 99, is_root: false }])
+    expect(openDoc.versions).toEqual([{ id: 99, is_root: false }])
+    expect(saveSpy).toHaveBeenCalled()
+    expect(selectSpy).toHaveBeenCalledWith(99)
+
+    component.selectedVersionId = 3
+    deleteSpy.mockReturnValueOnce(of({ result: 'ok' }))
+    versionsSpy.mockReturnValueOnce(
+      of({
+        id: doc.id,
+        versions: [
+          { id: 7, is_root: false },
+          { id: 9, is_root: false },
+        ],
+      } as Document)
+    )
+    component.deleteVersion(3)
+    expect(selectSpy).toHaveBeenCalledWith(7)
+
+    deleteSpy.mockReturnValueOnce(throwError(() => new Error('nope')))
+    component.deleteVersion(10)
+    expect(errorSpy).toHaveBeenCalled()
+  })
+
+  it('onVersionFileSelected should cover upload flows and reset status', () => {
+    initNormally()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+
+    const uploadSpy = jest.spyOn(documentService, 'uploadVersion')
+    const versionsSpy = jest.spyOn(documentService, 'getVersions')
+    const infoSpy = jest.spyOn(toastService, 'showInfo')
+    const finishedSpy = jest.spyOn(
+      websocketStatusService,
+      'onDocumentConsumptionFinished'
+    )
+    const failedSpy = jest.spyOn(
+      websocketStatusService,
+      'onDocumentConsumptionFailed'
+    )
+    const selectSpy = jest
+      .spyOn(component, 'selectVersion')
+      .mockImplementation(() => {})
+    const openDoc = { ...doc, versions: [] } as Document
+    jest.spyOn(openDocumentsService, 'getOpenDocument').mockReturnValue(openDoc)
+    const saveSpy = jest.spyOn(openDocumentsService, 'save')
+
+    component.onVersionFileSelected({ target: createFileInput() } as any)
+    expect(uploadSpy).not.toHaveBeenCalled()
+
+    const fileMissing = new File(['data'], 'version.pdf', {
+      type: 'application/pdf',
+    })
+    component.newVersionLabel = '  label  '
+    uploadSpy.mockReturnValueOnce(of({}))
+    component.onVersionFileSelected({
+      target: createFileInput(fileMissing),
+    } as any)
+    expect(uploadSpy).toHaveBeenCalledWith(
+      component.documentId,
+      fileMissing,
+      'label'
+    )
+    expect(component.newVersionLabel).toBe('')
+    expect(component.versionUploadState).toBe(UploadState.Failed)
+    expect(component.versionUploadError).toBe('Missing task ID.')
+    expect(infoSpy).toHaveBeenCalled()
+
+    const finishedFail$ = new Subject<any>()
+    const failedFail$ = new Subject<any>()
+    finishedSpy.mockReturnValueOnce(finishedFail$ as any)
+    failedSpy.mockReturnValueOnce(failedFail$ as any)
+    uploadSpy.mockReturnValueOnce(of('task-1'))
+    component.onVersionFileSelected({
+      target: createFileInput(
+        new File(['data'], 'version.pdf', { type: 'application/pdf' })
+      ),
+    } as any)
+    expect(component.versionUploadState).toBe(UploadState.Processing)
+    failedFail$.next({ taskId: 'task-1', message: 'nope' })
+    expect(component.versionUploadState).toBe(UploadState.Failed)
+    expect(component.versionUploadError).toBe('nope')
+    expect(versionsSpy).not.toHaveBeenCalled()
+
+    const finishedOk$ = new Subject<any>()
+    const failedOk$ = new Subject<any>()
+    finishedSpy.mockReturnValueOnce(finishedOk$ as any)
+    failedSpy.mockReturnValueOnce(failedOk$ as any)
+    uploadSpy.mockReturnValueOnce(of({ task_id: 'task-2' }))
+    const versions = [
+      { id: 7, is_root: false },
+      { id: 12, is_root: false },
+    ] as any
+    versionsSpy.mockReturnValueOnce(of({ id: doc.id, versions } as Document))
+    component.onVersionFileSelected({
+      target: createFileInput(
+        new File(['data'], 'version.pdf', { type: 'application/pdf' })
+      ),
+    } as any)
+    finishedOk$.next({ taskId: 'task-2' })
+
+    expect(component.document.versions).toEqual(versions)
+    expect(openDoc.versions).toEqual(versions)
+    expect(saveSpy).toHaveBeenCalled()
+    expect(selectSpy).toHaveBeenCalledWith(12)
+    expect(component.versionUploadState).toBe(UploadState.Idle)
+    expect(component.versionUploadError).toBeNull()
+
+    component.versionUploadState = UploadState.Failed
+    component.versionUploadError = 'boom'
+    component.clearVersionUploadStatus()
+    expect(component.versionUploadState).toBe(UploadState.Idle)
+    expect(component.versionUploadError).toBeNull()
+  })
+
   function initNormally() {
     jest
       .spyOn(activatedRoute, 'paramMap', 'get')

src-ui/src/app/components/document-detail/document-detail.component.ts

@@ -1,4 +1,4 @@
-import { AsyncPipe, NgTemplateOutlet } from '@angular/common'
+import { AsyncPipe, NgTemplateOutlet, SlicePipe } from '@angular/common'
 import { HttpClient, HttpResponse } from '@angular/common/http'
 import { Component, inject, OnDestroy, OnInit, ViewChild } from '@angular/core'
 import {
@@ -20,7 +20,7 @@ import {
 import { dirtyCheck, DirtyComponent } from '@ngneat/dirty-check-forms'
 import { NgxBootstrapIconsModule } from 'ngx-bootstrap-icons'
 import { DeviceDetectorService } from 'ngx-device-detector'
-import { BehaviorSubject, Observable, of, Subject, timer } from 'rxjs'
+import { BehaviorSubject, merge, Observable, of, Subject, timer } from 'rxjs'
 import {
   catchError,
   debounceTime,
@@ -29,6 +29,7 @@ import {
   first,
   map,
   switchMap,
+  take,
   takeUntil,
   tap,
 } from 'rxjs/operators'
@@ -80,10 +81,15 @@ import { TagService } from 'src/app/services/rest/tag.service'
 import { UserService } from 'src/app/services/rest/user.service'
 import { SettingsService } from 'src/app/services/settings.service'
 import { ToastService } from 'src/app/services/toast.service'
+import {
+  UploadState,
+  WebsocketStatusService,
+} from 'src/app/services/websocket-status.service'
 import { getFilenameFromContentDisposition } from 'src/app/utils/http'
 import { ISODateAdapter } from 'src/app/utils/ngb-iso-date-adapter'
 import * as UTIF from 'utif'
 import { DocumentDetailFieldID } from '../admin/settings/settings.component'
+import { ConfirmButtonComponent } from '../common/confirm-button/confirm-button.component'
 import { ConfirmDialogComponent } from '../common/confirm-dialog/confirm-dialog.component'
 import { PasswordRemovalConfirmDialogComponent } from '../common/confirm-dialog/password-removal-confirm-dialog/password-removal-confirm-dialog.component'
 import { CustomFieldsDropdownComponent } from '../common/custom-fields-dropdown/custom-fields-dropdown.component'
@@ -110,15 +116,16 @@ import { PDFEditorComponent } from '../common/pdf-editor/pdf-editor.component'
 import { PngxPdfViewerComponent } from '../common/pdf-viewer/pdf-viewer.component'
 import {
   PdfRenderMode,
+  PdfSource,
   PdfZoomLevel,
   PdfZoomScale,
   PngxPdfDocumentProxy,
 } from '../common/pdf-viewer/pdf-viewer.types'
 import { ShareLinksDialogComponent } from '../common/share-links-dialog/share-links-dialog.component'
 import { SuggestionsDropdownComponent } from '../common/suggestions-dropdown/suggestions-dropdown.component'
-import { DocumentHistoryComponent } from '../document-history/document-history.component'
 import { DocumentNotesComponent } from '../document-notes/document-notes.component'
 import { ComponentWithPermissions } from '../with-permissions/with-permissions.component'
+import { DocumentHistoryComponent } from './document-history/document-history.component'
 import { MetadataCollapseComponent } from './metadata-collapse/metadata-collapse.component'
 
 enum DocumentDetailNavIDs {
@@ -176,6 +183,8 @@ enum ContentRenderType {
     TextAreaComponent,
     RouterModule,
     PngxPdfViewerComponent,
+    ConfirmButtonComponent,
+    SlicePipe,
   ],
 })
 export class DocumentDetailComponent
@@ -183,6 +192,8 @@ export class DocumentDetailComponent
   implements OnInit, OnDestroy, DirtyComponent
 {
   PdfRenderMode = PdfRenderMode
+  UploadState = UploadState
+
   documentsService = inject(DocumentService)
   private route = inject(ActivatedRoute)
   private tagService = inject(TagService)
@@ -204,6 +215,7 @@ export class DocumentDetailComponent
   private componentRouterService = inject(ComponentRouterService)
   private deviceDetectorService = inject(DeviceDetectorService)
   private savedViewService = inject(SavedViewService)
+  private readonly websocketStatusService = inject(WebsocketStatusService)
 
   @ViewChild('inputTitle')
   titleInput: TextComponent
@@ -233,6 +245,13 @@ export class DocumentDetailComponent
   tiffURL: string
   tiffError: string
 
+  // Versioning
+  selectedVersionId: number
+  newVersionLabel: string = ''
+  pdfSource: PdfSource
+  versionUploadState: UploadState = UploadState.Idle
+  versionUploadError: string | null = null
+
   correspondents: Correspondent[]
   documentTypes: DocumentType[]
   storagePaths: StoragePath[]
@@ -278,6 +297,7 @@ export class DocumentDetailComponent
   public readonly DocumentDetailFieldID = DocumentDetailFieldID
 
   @ViewChild('nav') nav: NgbNav
+  @ViewChild('versionFileInput') versionFileInput
   @ViewChild('pdfPreview') set pdfPreview(element) {
     // this gets called when component added or removed from DOM
     if (
@@ -345,6 +365,17 @@ export class DocumentDetailComponent
     return ContentRenderType.Other
   }
 
+  private updatePdfSource() {
+    if (!this.previewUrl) {
+      this.pdfSource = undefined
+      return
+    }
+    this.pdfSource = {
+      url: this.previewUrl,
+      password: this.password || undefined,
+    }
+  }
+
   get isRTL() {
     if (!this.metadata || !this.metadata.lang) return false
     else {
@@ -420,7 +451,12 @@ export class DocumentDetailComponent
   }
 
   private loadDocument(documentId: number): void {
-    this.previewUrl = this.documentsService.getPreviewUrl(documentId)
+    let redirectedToRoot = false
+    this.selectedVersionId = documentId
+    this.previewUrl = this.documentsService.getPreviewUrl(
+      this.selectedVersionId
+    )
+    this.updatePdfSource()
     this.http
       .get(this.previewUrl, { responseType: 'text' })
       .pipe(
@@ -435,11 +471,28 @@ export class DocumentDetailComponent
             err.message ?? err.toString()
           }`),
       })
-    this.thumbUrl = this.documentsService.getThumbUrl(documentId)
+    this.thumbUrl = this.documentsService.getThumbUrl(this.selectedVersionId)
     this.documentsService
       .get(documentId)
       .pipe(
-        catchError(() => {
+        catchError((error) => {
+          if (error?.status === 404) {
+            return this.documentsService.getRootId(documentId).pipe(
+              map((result) => {
+                const rootId = result?.root_id
+                if (rootId && rootId !== documentId) {
+                  const section =
+                    this.route.snapshot.paramMap.get('section') || 'details'
+                  redirectedToRoot = true
+                  this.router.navigate(['documents', rootId, section], {
+                    replaceUrl: true,
+                  })
+                }
+                return null
+              }),
+              catchError(() => of(null))
+            )
+          }
           // 404 is handled in the subscribe below
           return of(null)
         }),
@@ -450,6 +503,9 @@ export class DocumentDetailComponent
       .subscribe({
         next: (doc) => {
           if (!doc) {
+            if (redirectedToRoot) {
+              return
+            }
             this.router.navigate(['404'], { replaceUrl: true })
             return
           }
@@ -666,6 +722,11 @@ export class DocumentDetailComponent
 
   updateComponent(doc: Document) {
     this.document = doc
+    // Default selected version is the newest version
+    const versions = doc.versions ?? []
+    this.selectedVersionId = versions.length
+      ? Math.max(...versions.map((version) => version.id))
+      : doc.id
     this.requiresPassword = false
     this.updateFormForCustomFields()
     if (this.archiveContentRenderType === ContentRenderType.TIFF) {
@@ -724,6 +785,73 @@ export class DocumentDetailComponent
     }
   }
 
+  // Update file preview and download target to a specific version (by document id)
+  selectVersion(versionId: number) {
+    this.selectedVersionId = versionId
+    this.previewUrl = this.documentsService.getPreviewUrl(
+      this.documentId,
+      false,
+      this.selectedVersionId
+    )
+    this.updatePdfSource()
+    this.thumbUrl = this.documentsService.getThumbUrl(this.selectedVersionId)
+    // For text previews, refresh content
+    this.http
+      .get(this.previewUrl, { responseType: 'text' })
+      .pipe(
+        first(),
+        takeUntil(this.unsubscribeNotifier),
+        takeUntil(this.docChangeNotifier)
+      )
+      .subscribe({
+        next: (res) => (this.previewText = res.toString()),
+        error: (err) =>
+          (this.previewText = $localize`An error occurred loading content: ${
+            err.message ?? err.toString()
+          }`),
+      })
+  }
+
+  deleteVersion(versionId: number) {
+    const wasSelected = this.selectedVersionId === versionId
+    this.documentsService
+      .deleteVersion(this.documentId, versionId)
+      .pipe(
+        switchMap((result) =>
+          this.documentsService
+            .getVersions(this.documentId)
+            .pipe(map((doc) => ({ doc, result })))
+        ),
+        first(),
+        takeUntil(this.unsubscribeNotifier)
+      )
+      .subscribe({
+        next: ({ doc, result }) => {
+          if (doc?.versions) {
+            this.document.versions = doc.versions
+            const openDoc = this.openDocumentService.getOpenDocument(
+              this.documentId
+            )
+            if (openDoc) {
+              openDoc.versions = doc.versions
+              this.openDocumentService.save()
+            }
+          }
+
+          if (wasSelected) {
+            const fallbackId =
+              result?.current_version_id ??
+              doc?.versions?.[0]?.id ??
+              this.documentId
+            this.selectVersion(fallbackId)
+          }
+        },
+        error: (error) => {
+          this.toastService.showError($localize`Error deleting version`, error)
+        },
+      })
+  }
+
   get customFieldFormFields(): FormArray {
     return this.documentForm.get('custom_fields') as FormArray
   }
@@ -1140,10 +1268,102 @@ export class DocumentDetailComponent
     })
   }
 
+  onVersionFileSelected(event: Event) {
+    const input = event.target as HTMLInputElement
+    if (!input?.files || input.files.length === 0) return
+    const file = input.files[0]
+    // Reset input to allow re-selection of the same file later
+    input.value = ''
+    const label = this.newVersionLabel?.trim()
+    this.versionUploadState = UploadState.Uploading
+    this.versionUploadError = null
+    this.documentsService
+      .uploadVersion(this.documentId, file, label)
+      .pipe(
+        first(),
+        tap(() => {
+          this.toastService.showInfo(
+            $localize`Uploading new version. Processing will happen in the background.`
+          )
+          this.newVersionLabel = ''
+          this.versionUploadState = UploadState.Processing
+        }),
+        map((taskId) =>
+          typeof taskId === 'string'
+            ? taskId
+            : (taskId as { task_id?: string })?.task_id
+        ),
+        switchMap((taskId) => {
+          if (!taskId) {
+            this.versionUploadState = UploadState.Failed
+            this.versionUploadError = $localize`Missing task ID.`
+            return of(null)
+          }
+          return merge(
+            this.websocketStatusService.onDocumentConsumptionFinished().pipe(
+              filter((status) => status.taskId === taskId),
+              map(() => ({ state: 'success' as const }))
+            ),
+            this.websocketStatusService.onDocumentConsumptionFailed().pipe(
+              filter((status) => status.taskId === taskId),
+              map((status) => ({
+                state: 'failed' as const,
+                message: status.message,
+              }))
+            )
+          ).pipe(take(1))
+        }),
+        switchMap((result) => {
+          if (result?.state !== 'success') {
+            if (result?.state === 'failed') {
+              this.versionUploadState = UploadState.Failed
+              this.versionUploadError =
+                result.message || $localize`Upload failed.`
+            }
+            return of(null)
+          }
+          return this.documentsService.getVersions(this.documentId)
+        }),
+        takeUntil(this.unsubscribeNotifier),
+        takeUntil(this.docChangeNotifier)
+      )
+      .subscribe({
+        next: (doc) => {
+          if (doc?.versions) {
+            this.document.versions = doc.versions
+            const openDoc = this.openDocumentService.getOpenDocument(
+              this.documentId
+            )
+            if (openDoc) {
+              openDoc.versions = doc.versions
+              this.openDocumentService.save()
+            }
+            this.selectVersion(
+              Math.max(...doc.versions.map((version) => version.id))
+            )
+            this.clearVersionUploadStatus()
+          }
+        },
+        error: (error) => {
+          this.versionUploadState = UploadState.Failed
+          this.versionUploadError = error?.message || $localize`Upload failed.`
+          this.toastService.showError(
+            $localize`Error uploading new version`,
+            error
+          )
+        },
+      })
+  }
+
+  clearVersionUploadStatus() {
+    this.versionUploadState = UploadState.Idle
+    this.versionUploadError = null
+  }
+
   download(original: boolean = false) {
     this.downloading = true
     const downloadUrl = this.documentsService.getDownloadUrl(
-      this.documentId,
+      this.selectedVersionId || this.documentId,
       original
     )
     this.http
@@ -1230,6 +1450,7 @@ export class DocumentDetailComponent
   onPasswordKeyUp(event: KeyboardEvent) {
     if ('Enter' == event.key) {
       this.password = (event.target as HTMLInputElement).value
+      this.updatePdfSource()
     }
   }
 

src-ui/src/app/components/document-detail/document-history/document-history.component.html

@@ -1,6 +1,6 @@
 @if (loading) {
     <div class="d-flex">
-        <div class="spinner-border spinner-border-sm fw-normal" role="status"></div>
+        <output class="spinner-border spinner-border-sm fw-normal" role="status"></output>
     </div>
 } @else {
     <ul class="list-group">

src-ui/src/app/components/document-detail/document-history/document-history.component.spec.ts

@@ -83,8 +83,22 @@ describe('DocumentHistoryComponent', () => {
         expect(result).toBe(correspondentName)
       })
     expect(getCachedSpy).toHaveBeenCalledWith(parseInt(correspondentId))
-    // no correspondent found
-    getCachedSpy.mockReturnValue(of(null))
+  })
+
+  it('getPrettyName should memoize results to avoid resubscribe loops', () => {
+    const correspondentId = '1'
+    const getCachedSpy = jest
+      .spyOn(correspondentService, 'getCached')
+      .mockReturnValue(of({ name: 'John Doe' }))
+    const a = component.getPrettyName(DataType.Correspondent, correspondentId)
+    const b = component.getPrettyName(DataType.Correspondent, correspondentId)
+    expect(a).toBe(b)
+    expect(getCachedSpy).toHaveBeenCalledTimes(1)
+  })
+
+  it('getPrettyName should fall back to the correspondent id when missing', () => {
+    const correspondentId = '1'
+    jest.spyOn(correspondentService, 'getCached').mockReturnValue(of(null))
     component
       .getPrettyName(DataType.Correspondent, correspondentId)
       .subscribe((result) => {
@@ -104,8 +118,11 @@ describe('DocumentHistoryComponent', () => {
         expect(result).toBe(documentTypeName)
       })
     expect(getCachedSpy).toHaveBeenCalledWith(parseInt(documentTypeId))
-    // no document type found
-    getCachedSpy.mockReturnValue(of(null))
+  })
+
+  it('getPrettyName should fall back to the document type id when missing', () => {
+    const documentTypeId = '1'
+    jest.spyOn(documentTypeService, 'getCached').mockReturnValue(of(null))
     component
       .getPrettyName(DataType.DocumentType, documentTypeId)
       .subscribe((result) => {
@@ -125,8 +142,11 @@ describe('DocumentHistoryComponent', () => {
         expect(result).toBe(storagePath)
       })
     expect(getCachedSpy).toHaveBeenCalledWith(parseInt(storagePathId))
-    // no storage path found
-    getCachedSpy.mockReturnValue(of(null))
+  })
+
+  it('getPrettyName should fall back to the storage path id when missing', () => {
+    const storagePathId = '1'
+    jest.spyOn(storagePathService, 'getCached').mockReturnValue(of(null))
     component
       .getPrettyName(DataType.StoragePath, storagePathId)
       .subscribe((result) => {
@@ -144,8 +164,11 @@ describe('DocumentHistoryComponent', () => {
       expect(result).toBe(ownerUsername)
     })
     expect(getCachedSpy).toHaveBeenCalledWith(parseInt(ownerId))
-    // no user found
-    getCachedSpy.mockReturnValue(of(null))
+  })
+
+  it('getPrettyName should fall back to the owner id when missing', () => {
+    const ownerId = '1'
+    jest.spyOn(userService, 'getCached').mockReturnValue(of(null))
     component.getPrettyName('owner', ownerId).subscribe((result) => {
       expect(result).toBe(ownerId)
     })

src-ui/src/app/components/document-detail/document-history/document-history.component.ts

@@ -0,0 +1,114 @@
+import { AsyncPipe, KeyValuePipe, TitleCasePipe } from '@angular/common'
+import { Component, Input, OnInit, inject } from '@angular/core'
+import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap'
+import { NgxBootstrapIconsModule } from 'ngx-bootstrap-icons'
+import { Observable, first, map, of, shareReplay } from 'rxjs'
+import { AuditLogAction, AuditLogEntry } from 'src/app/data/auditlog-entry'
+import { DataType } from 'src/app/data/datatype'
+import { CustomDatePipe } from 'src/app/pipes/custom-date.pipe'
+import { CorrespondentService } from 'src/app/services/rest/correspondent.service'
+import { DocumentTypeService } from 'src/app/services/rest/document-type.service'
+import { DocumentService } from 'src/app/services/rest/document.service'
+import { StoragePathService } from 'src/app/services/rest/storage-path.service'
+import { UserService } from 'src/app/services/rest/user.service'
+
+@Component({
+  selector: 'pngx-document-history',
+  templateUrl: './document-history.component.html',
+  styleUrl: './document-history.component.scss',
+  imports: [
+    CustomDatePipe,
+    NgbTooltipModule,
+    AsyncPipe,
+    KeyValuePipe,
+    TitleCasePipe,
+    NgxBootstrapIconsModule,
+  ],
+})
+export class DocumentHistoryComponent implements OnInit {
+  private documentService = inject(DocumentService)
+  private correspondentService = inject(CorrespondentService)
+  private storagePathService = inject(StoragePathService)
+  private documentTypeService = inject(DocumentTypeService)
+  private userService = inject(UserService)
+
+  public AuditLogAction = AuditLogAction
+
+  private _documentId: number
+  @Input()
+  set documentId(id: number) {
+    if (this._documentId !== id) {
+      this._documentId = id
+      this.prettyNameCache.clear()
+      this.loadHistory()
+    }
+  }
+
+  public loading: boolean = true
+  public entries: AuditLogEntry[] = []
+
+  private readonly prettyNameCache = new Map<string, Observable<string>>()
+
+  ngOnInit(): void {
+    this.loadHistory()
+  }
+
+  private loadHistory(): void {
+    if (this._documentId) {
+      this.loading = true
+      this.documentService.getHistory(this._documentId).subscribe((entries) => {
+        this.entries = entries
+        this.loading = false
+      })
+    }
+  }
+
+  getPrettyName(type: DataType | string, id: string): Observable<string> {
+    const cacheKey = `${type}:${id}`
+    const cached = this.prettyNameCache.get(cacheKey)
+    if (cached) {
+      return cached
+    }
+
+    const idInt = parseInt(id, 10)
+    const fallback$ = of(id)
+
+    let result$: Observable<string>
+    if (!Number.isFinite(idInt)) {
+      result$ = fallback$
+    } else {
+      switch (type) {
+        case DataType.Correspondent:
+          result$ = this.correspondentService.getCached(idInt).pipe(
+            first(),
+            map((correspondent) => correspondent?.name ?? id)
+          )
+          break
+        case DataType.DocumentType:
+          result$ = this.documentTypeService.getCached(idInt).pipe(
+            first(),
+            map((documentType) => documentType?.name ?? id)
+          )
+          break
+        case DataType.StoragePath:
+          result$ = this.storagePathService.getCached(idInt).pipe(
+            first(),
+            map((storagePath) => storagePath?.path ?? id)
+          )
+          break
+        case 'owner':
+          result$ = this.userService.getCached(idInt).pipe(
+            first(),
+            map((user) => user?.username ?? id)
+          )
+          break
+        default:
+          result$ = fallback$
+      }
+    }
+
+    const shared$ = result$.pipe(shareReplay({ bufferSize: 1, refCount: true }))
+    this.prettyNameCache.set(cacheKey, shared$)
+    return shared$
+  }
+}

src-ui/src/app/components/document-history/document-history.component.ts

@@ -1,85 +0,0 @@
-import { AsyncPipe, KeyValuePipe, TitleCasePipe } from '@angular/common'
-import { Component, Input, OnInit, inject } from '@angular/core'
-import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap'
-import { NgxBootstrapIconsModule } from 'ngx-bootstrap-icons'
-import { Observable, first, map, of } from 'rxjs'
-import { AuditLogAction, AuditLogEntry } from 'src/app/data/auditlog-entry'
-import { DataType } from 'src/app/data/datatype'
-import { CustomDatePipe } from 'src/app/pipes/custom-date.pipe'
-import { CorrespondentService } from 'src/app/services/rest/correspondent.service'
-import { DocumentTypeService } from 'src/app/services/rest/document-type.service'
-import { DocumentService } from 'src/app/services/rest/document.service'
-import { StoragePathService } from 'src/app/services/rest/storage-path.service'
-import { UserService } from 'src/app/services/rest/user.service'
-
-@Component({
-  selector: 'pngx-document-history',
-  templateUrl: './document-history.component.html',
-  styleUrl: './document-history.component.scss',
-  imports: [
-    CustomDatePipe,
-    NgbTooltipModule,
-    AsyncPipe,
-    KeyValuePipe,
-    TitleCasePipe,
-    NgxBootstrapIconsModule,
-  ],
-})
-export class DocumentHistoryComponent implements OnInit {
-  private documentService = inject(DocumentService)
-  private correspondentService = inject(CorrespondentService)
-  private storagePathService = inject(StoragePathService)
-  private documentTypeService = inject(DocumentTypeService)
-  private userService = inject(UserService)
-
-  public AuditLogAction = AuditLogAction
-
-  private _documentId: number
-  @Input()
-  set documentId(id: number) {
-    this._documentId = id
-    this.ngOnInit()
-  }
-
-  public loading: boolean = true
-  public entries: AuditLogEntry[] = []
-
-  ngOnInit(): void {
-    if (this._documentId) {
-      this.loading = true
-      this.documentService
-        .getHistory(this._documentId)
-        .subscribe((auditLogEntries) => {
-          this.entries = auditLogEntries
-          this.loading = false
-        })
-    }
-  }
-
-  getPrettyName(type: DataType | string, id: string): Observable<string> {
-    switch (type) {
-      case DataType.Correspondent:
-        return this.correspondentService.getCached(parseInt(id, 10)).pipe(
-          first(),
-          map((correspondent) => correspondent?.name ?? id)
-        )
-      case DataType.DocumentType:
-        return this.documentTypeService.getCached(parseInt(id, 10)).pipe(
-          first(),
-          map((documentType) => documentType?.name ?? id)
-        )
-      case DataType.StoragePath:
-        return this.storagePathService.getCached(parseInt(id, 10)).pipe(
-          first(),
-          map((storagePath) => storagePath?.path ?? id)
-        )
-      case 'owner':
-        return this.userService.getCached(parseInt(id, 10)).pipe(
-          first(),
-          map((user) => user?.username ?? id)
-        )
-      default:
-        return of(id)
-    }
-  }
-}

src-ui/src/app/data/document.ts

@@ -161,6 +161,18 @@ export interface Document extends ObjectWithPermissions {
 
   duplicate_documents?: Document[]
 
+  // Versioning
+  root_document?: number
+  versions?: DocumentVersionInfo[]
+
   // Frontend only
   __changedFields?: string[]
 }
+
+export interface DocumentVersionInfo {
+  id: number
+  added?: Date
+  version_label?: string
+  checksum?: string
+  is_root: boolean
+}

src-ui/src/app/services/rest/document.service.spec.ts

@@ -233,6 +233,13 @@ describe(`DocumentService`, () => {
     )
   })
 
+  it('should return the correct preview URL for a specific version', () => {
+    const url = service.getPreviewUrl(documents[0].id, false, 123)
+    expect(url).toEqual(
+      `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/preview/?version=123`
+    )
+  })
+
   it('should return the correct thumb URL for a single document', () => {
     let url = service.getThumbUrl(documents[0].id)
     expect(url).toEqual(
@@ -289,6 +296,43 @@ describe(`DocumentService`, () => {
       `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/history/`
     )
   })
+
+  it('should call appropriate api endpoint for getting root document id', () => {
+    subscription = service.getRootId(documents[0].id).subscribe()
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/root/`
+    )
+    expect(req.request.method).toEqual('GET')
+    req.flush({ root_id: documents[0].id })
+  })
+
+  it('should call appropriate api endpoint for deleting a document version', () => {
+    subscription = service.deleteVersion(documents[0].id, 10).subscribe()
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/versions/10/`
+    )
+    expect(req.request.method).toEqual('DELETE')
+    req.flush({ result: 'OK', current_version_id: documents[0].id })
+  })
+
+  it('should call appropriate api endpoint for uploading a new version', () => {
+    const file = new File(['hello'], 'test.pdf', { type: 'application/pdf' })
+
+    subscription = service
+      .uploadVersion(documents[0].id, file, 'Label')
+      .subscribe()
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/update_version/`
+    )
+    expect(req.request.method).toEqual('POST')
+    expect(req.request.body).toBeInstanceOf(FormData)
+
+    const body = req.request.body as FormData
+    expect(body.get('version_label')).toEqual('Label')
+    expect(body.get('document')).toBeInstanceOf(File)
+
+    req.flush('task-id')
+  })
 })
 
 it('should construct sort fields respecting permissions', () => {

src-ui/src/app/services/rest/document.service.ts

@@ -163,12 +163,19 @@ export class DocumentService extends AbstractPaperlessService<Document> {
     })
   }
 
-  getPreviewUrl(id: number, original: boolean = false): string {
+  getPreviewUrl(
+    id: number,
+    original: boolean = false,
+    versionID: number = null
+  ): string {
     let url = new URL(this.getResourceUrl(id, 'preview'))
     if (this._searchQuery) url.hash = `#search="${this.searchQuery}"`
     if (original) {
       url.searchParams.append('original', 'true')
     }
+    if (versionID) {
+      url.searchParams.append('version', versionID.toString())
+    }
     return url.toString()
   }
 
@@ -184,6 +191,38 @@ export class DocumentService extends AbstractPaperlessService<Document> {
     return url
   }
 
+  uploadVersion(documentId: number, file: File, versionLabel?: string) {
+    const formData = new FormData()
+    formData.append('document', file, file.name)
+    if (versionLabel) {
+      formData.append('version_label', versionLabel)
+    }
+    return this.http.post<string>(
+      this.getResourceUrl(documentId, 'update_version'),
+      formData
+    )
+  }
+
+  getVersions(documentId: number): Observable<Document> {
+    return this.http.get<Document>(this.getResourceUrl(documentId), {
+      params: {
+        fields: 'id,versions',
+      },
+    })
+  }
+
+  getRootId(documentId: number) {
+    return this.http.get<{ root_id: number }>(
+      this.getResourceUrl(documentId, 'root')
+    )
+  }
+
+  deleteVersion(rootDocumentId: number, versionId: number) {
+    return this.http.delete<{ result: string; current_version_id: number }>(
+      this.getResourceUrl(rootDocumentId, `versions/${versionId}`)
+    )
+  }
+
   getNextAsn(): Observable<number> {
     return this.http.get<number>(this.getResourceUrl(null, 'next_asn'))
   }

src-ui/src/app/services/websocket-status.service.ts

@@ -89,6 +89,13 @@ export class FileStatus {
   }
 }
 
+export enum UploadState {
+  Idle = 'idle',
+  Uploading = 'uploading',
+  Processing = 'processing',
+  Failed = 'failed',
+}
+
 @Injectable({
   providedIn: 'root',
 })

src-ui/src/main.ts

@@ -79,9 +79,11 @@ import {
   eye,
   fileEarmark,
   fileEarmarkCheck,
+  fileEarmarkDiff,
   fileEarmarkFill,
   fileEarmarkLock,
   fileEarmarkMinus,
+  fileEarmarkPlus,
   fileEarmarkRichtext,
   fileText,
   files,
@@ -297,9 +299,11 @@ const icons = {
   eye,
   fileEarmark,
   fileEarmarkCheck,
+  fileEarmarkDiff,
   fileEarmarkFill,
   fileEarmarkLock,
   fileEarmarkMinus,
+  fileEarmarkPlus,
   fileEarmarkRichtext,
   files,
   fileText,

src/documents/barcodes.py

@@ -28,6 +28,8 @@ from documents.utils import maybe_override_pixel_limit
 from paperless.config import BarcodeConfig
 
 if TYPE_CHECKING:
+    from collections.abc import Callable
+
     from PIL import Image
 
 logger = logging.getLogger("paperless.barcodes")
@@ -260,6 +262,26 @@ class BarcodePlugin(ConsumeTaskPlugin):
 
         return barcodes
 
+    @staticmethod
+    def read_barcodes_pyzbar(image: Image.Image) -> list[str]:
+        barcodes = []
+
+        from pyzbar import pyzbar
+
+        # Decode the barcode image
+        detected_barcodes = pyzbar.decode(image)
+
+        # Traverse through all the detected barcodes in image
+        for barcode in detected_barcodes:
+            if barcode.data:
+                decoded_barcode = barcode.data.decode("utf-8")
+                barcodes.append(decoded_barcode)
+                logger.debug(
+                    f"Barcode of type {barcode.type} found: {decoded_barcode}",
+                )
+
+        return barcodes
+
     def detect(self) -> None:
         """
         Scan all pages of the PDF as images, updating barcodes and the pages
@@ -272,6 +294,14 @@ class BarcodePlugin(ConsumeTaskPlugin):
         # No op if not a TIFF
         self.convert_from_tiff_to_pdf()
 
+        # Choose the library for reading
+        if settings.CONSUMER_BARCODE_SCANNER == "PYZBAR":
+            reader: Callable[[Image.Image], list[str]] = self.read_barcodes_pyzbar
+            logger.debug("Scanning for barcodes using PYZBAR")
+        else:
+            reader = self.read_barcodes_zxing
+            logger.debug("Scanning for barcodes using ZXING")
+
         try:
             # Read number of pages from pdf
             with Pdf.open(self.pdf_file) as pdf:
@@ -319,7 +349,7 @@ class BarcodePlugin(ConsumeTaskPlugin):
                     )
 
                 # Detect barcodes
-                for barcode_value in self.read_barcodes_zxing(page):
+                for barcode_value in reader(page):
                     self.barcodes.append(
                         Barcode(current_page_number, barcode_value, self.settings),
                     )

src/documents/bulk_edit.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import hashlib
 import logging
 import tempfile
 from pathlib import Path
@@ -73,6 +72,48 @@ def restore_archive_serial_numbers(backup: dict[int, int | None]) -> None:
     logger.info(f"Restored archive serial numbers for documents {list(backup.keys())}")
 
 
+def _get_root_ids_by_doc_id(doc_ids: list[int]) -> dict[int, int]:
+    """
+    Resolve each provided document id to its root document id.
+
+    - If the id is already a root document: root id is itself.
+    - If the id is a version document: root id is its `root_document_id`.
+    """
+    qs = Document.objects.filter(id__in=doc_ids).only("id", "root_document_id")
+    return {doc.id: doc.root_document_id or doc.id for doc in qs}
+
+
+def _get_root_and_current_docs_by_root_id(
+    root_ids: set[int],
+) -> tuple[dict[int, Document], dict[int, Document]]:
+    """
+    Returns:
+      - root_docs: root_id -> root Document
+      - current_docs: root_id -> newest version Document (or root if none)
+    """
+    root_docs = {
+        doc.id: doc
+        for doc in Document.objects.filter(id__in=root_ids).select_related(
+            "owner",
+        )
+    }
+    latest_versions_by_root_id: dict[int, Document] = {}
+    for version_doc in Document.objects.filter(root_document_id__in=root_ids).order_by(
+        "root_document_id",
+        "-id",
+    ):
+        root_id = version_doc.root_document_id
+        if root_id is None:
+            continue
+        latest_versions_by_root_id.setdefault(root_id, version_doc)
+
+    current_docs: dict[int, Document] = {
+        root_id: latest_versions_by_root_id.get(root_id, root_docs[root_id])
+        for root_id in root_docs
+    }
+    return root_docs, current_docs
+
+
 def set_correspondent(
     doc_ids: list[int],
     correspondent: Correspondent,
@@ -309,16 +350,28 @@ def modify_custom_fields(
 @shared_task
 def delete(doc_ids: list[int]) -> Literal["OK"]:
     try:
-        Document.objects.filter(id__in=doc_ids).delete()
+        root_ids = (
+            Document.objects.filter(id__in=doc_ids, root_document__isnull=True)
+            .values_list("id", flat=True)
+            .distinct()
+        )
+        version_ids = (
+            Document.objects.filter(root_document_id__in=root_ids)
+            .values_list("id", flat=True)
+            .distinct()
+        )
+        delete_ids = list({*doc_ids, *version_ids})
+
+        Document.objects.filter(id__in=delete_ids).delete()
 
         from documents import index
 
         with index.open_index_writer() as writer:
-            for id in doc_ids:
+            for id in delete_ids:
                 index.remove_document_by_id(writer, id)
 
         status_mgr = DocumentsStatusManager()
-        status_mgr.send_documents_deleted(doc_ids)
+        status_mgr.send_documents_deleted(delete_ids)
     except Exception as e:
         if "Data too long for column" in str(e):
             logger.warning(
@@ -363,43 +416,60 @@ def set_permissions(
     return "OK"
 
 
-def rotate(doc_ids: list[int], degrees: int) -> Literal["OK"]:
+def rotate(
+    doc_ids: list[int],
+    degrees: int,
+    *,
+    user: User | None = None,
+) -> Literal["OK"]:
     logger.info(
         f"Attempting to rotate {len(doc_ids)} documents by {degrees} degrees.",
     )
-    qs = Document.objects.filter(id__in=doc_ids)
-    affected_docs: list[int] = []
+    doc_to_root_id = _get_root_ids_by_doc_id(doc_ids)
+    root_ids = set(doc_to_root_id.values())
+    root_docs_by_id, current_docs_by_root_id = _get_root_and_current_docs_by_root_id(
+        root_ids,
+    )
     import pikepdf
 
-    rotate_tasks = []
-    for doc in qs:
-        if doc.mime_type != "application/pdf":
+    for root_id in root_ids:
+        root_doc = root_docs_by_id[root_id]
+        source_doc = current_docs_by_root_id[root_id]
+        if source_doc.mime_type != "application/pdf":
             logger.warning(
-                f"Document {doc.id} is not a PDF, skipping rotation.",
+                f"Document {root_doc.id} is not a PDF, skipping rotation.",
             )
             continue
         try:
-            with pikepdf.open(doc.source_path, allow_overwriting_input=True) as pdf:
+            # Write rotated output to a temp file and create a new version via consume pipeline
+            filepath: Path = (
+                Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
+                / f"{root_doc.id}_rotated.pdf"
+            )
+            with pikepdf.open(source_doc.source_path) as pdf:
                 for page in pdf.pages:
                     page.rotate(degrees, relative=True)
-                pdf.save()
-                doc.checksum = hashlib.md5(doc.source_path.read_bytes()).hexdigest()
-                doc.save()
-                rotate_tasks.append(
-                    update_document_content_maybe_archive_file.s(
-                        document_id=doc.id,
+                pdf.remove_unreferenced_resources()
+                pdf.save(filepath)
+
+            # Preserve metadata/permissions via overrides; mark as new version
+            overrides = DocumentMetadataOverrides().from_document(root_doc)
+            if user is not None:
+                overrides.actor_id = user.id
+
+            consume_file.delay(
+                ConsumableDocument(
+                    source=DocumentSource.ConsumeFolder,
+                    original_file=filepath,
+                    root_document_id=root_doc.id,
                 ),
+                overrides,
             )
             logger.info(
-                    f"Rotated document {doc.id} by {degrees} degrees",
+                f"Queued new rotated version for document {root_doc.id} by {degrees} degrees",
             )
-                affected_docs.append(doc.id)
         except Exception as e:
-            logger.exception(f"Error rotating document {doc.id}: {e}")
-
-    if len(affected_docs) > 0:
-        bulk_update_task = bulk_update_documents.si(document_ids=affected_docs)
-        chord(header=rotate_tasks, body=bulk_update_task).delay()
+            logger.exception(f"Error rotating document {root_doc.id}: {e}")
 
     return "OK"
 
@@ -584,30 +654,62 @@ def split(
     return "OK"
 
 
-def delete_pages(doc_ids: list[int], pages: list[int]) -> Literal["OK"]:
+def delete_pages(
+    doc_ids: list[int],
+    pages: list[int],
+    *,
+    user: User | None = None,
+) -> Literal["OK"]:
     logger.info(
         f"Attempting to delete pages {pages} from {len(doc_ids)} documents",
     )
-    doc = Document.objects.get(id=doc_ids[0])
+    doc = Document.objects.select_related("root_document").get(id=doc_ids[0])
+    root_doc: Document
+    if doc.root_document_id is None or doc.root_document is None:
+        root_doc = doc
+    else:
+        root_doc = doc.root_document
+
+    source_doc = (
+        Document.objects.filter(Q(id=root_doc.id) | Q(root_document=root_doc))
+        .order_by("-id")
+        .first()
+    )
+    if source_doc is None:
+        source_doc = root_doc
     pages = sorted(pages)  # sort pages to avoid index issues
     import pikepdf
 
     try:
-        with pikepdf.open(doc.source_path, allow_overwriting_input=True) as pdf:
+        # Produce edited PDF to a temp file and create a new version
+        filepath: Path = (
+            Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
+            / f"{root_doc.id}_pages_deleted.pdf"
+        )
+        with pikepdf.open(source_doc.source_path) as pdf:
             offset = 1  # pages are 1-indexed
             for page_num in pages:
                 pdf.pages.remove(pdf.pages[page_num - offset])
                 offset += 1  # remove() changes the index of the pages
             pdf.remove_unreferenced_resources()
-            pdf.save()
-            doc.checksum = hashlib.md5(doc.source_path.read_bytes()).hexdigest()
-            if doc.page_count is not None:
-                doc.page_count = doc.page_count - len(pages)
-            doc.save()
-            update_document_content_maybe_archive_file.delay(document_id=doc.id)
-            logger.info(f"Deleted pages {pages} from document {doc.id}")
+            pdf.save(filepath)
+
+        overrides = DocumentMetadataOverrides().from_document(root_doc)
+        if user is not None:
+            overrides.actor_id = user.id
+        consume_file.delay(
+            ConsumableDocument(
+                source=DocumentSource.ConsumeFolder,
+                original_file=filepath,
+                root_document_id=root_doc.id,
+            ),
+            overrides,
+        )
+        logger.info(
+            f"Queued new version for document {root_doc.id} after deleting pages {pages}",
+        )
     except Exception as e:
-        logger.exception(f"Error deleting pages from document {doc.id}: {e}")
+        logger.exception(f"Error deleting pages from document {root_doc.id}: {e}")
 
     return "OK"
 
@@ -632,13 +734,26 @@ def edit_pdf(
     logger.info(
         f"Editing PDF of document {doc_ids[0]} with {len(operations)} operations",
     )
-    doc = Document.objects.get(id=doc_ids[0])
+    doc = Document.objects.select_related("root_document").get(id=doc_ids[0])
+    root_doc: Document
+    if doc.root_document_id is None or doc.root_document is None:
+        root_doc = doc
+    else:
+        root_doc = doc.root_document
+
+    source_doc = (
+        Document.objects.filter(Q(id=root_doc.id) | Q(root_document=root_doc))
+        .order_by("-id")
+        .first()
+    )
+    if source_doc is None:
+        source_doc = root_doc
     import pikepdf
 
     pdf_docs: list[pikepdf.Pdf] = []
 
     try:
-        with pikepdf.open(doc.source_path) as src:
+        with pikepdf.open(source_doc.source_path) as src:
             # prepare output documents
             max_idx = max(op.get("doc", 0) for op in operations)
             pdf_docs = [pikepdf.new() for _ in range(max_idx + 1)]
@@ -657,42 +772,56 @@ def edit_pdf(
                     dst.pages[-1].rotate(op["rotate"], relative=True)
 
         if update_document:
-            temp_path = doc.source_path.with_suffix(".tmp.pdf")
+            # Create a new version from the edited PDF rather than replacing in-place
             pdf = pdf_docs[0]
             pdf.remove_unreferenced_resources()
-            # save the edited PDF to a temporary file in case of errors
-            pdf.save(temp_path)
-            # replace the original document with the edited one
-            temp_path.replace(doc.source_path)
-            doc.checksum = hashlib.md5(doc.source_path.read_bytes()).hexdigest()
-            doc.page_count = len(pdf.pages)
-            doc.save()
-            update_document_content_maybe_archive_file.delay(document_id=doc.id)
-        else:
-            consume_tasks = []
+            filepath: Path = (
+                Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
+                / f"{root_doc.id}_edited.pdf"
+            )
+            pdf.save(filepath)
             overrides = (
-                DocumentMetadataOverrides().from_document(doc)
+                DocumentMetadataOverrides().from_document(root_doc)
                 if include_metadata
                 else DocumentMetadataOverrides()
             )
             if user is not None:
                 overrides.owner_id = user.id
+                overrides.actor_id = user.id
+            consume_file.delay(
+                ConsumableDocument(
+                    source=DocumentSource.ConsumeFolder,
+                    original_file=filepath,
+                    root_document_id=root_doc.id,
+                ),
+                overrides,
+            )
+        else:
+            consume_tasks = []
+            overrides = (
+                DocumentMetadataOverrides().from_document(root_doc)
+                if include_metadata
+                else DocumentMetadataOverrides()
+            )
+            if user is not None:
+                overrides.owner_id = user.id
+                overrides.actor_id = user.id
             if not delete_original:
                 overrides.skip_asn_if_exists = True
             if delete_original and len(pdf_docs) == 1:
-                overrides.asn = doc.archive_serial_number
+                overrides.asn = root_doc.archive_serial_number
             for idx, pdf in enumerate(pdf_docs, start=1):
-                filepath: Path = (
+                version_filepath: Path = (
                     Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
-                    / f"{doc.id}_edit_{idx}.pdf"
+                    / f"{root_doc.id}_edit_{idx}.pdf"
                 )
                 pdf.remove_unreferenced_resources()
-                pdf.save(filepath)
+                pdf.save(version_filepath)
                 consume_tasks.append(
                     consume_file.s(
                         ConsumableDocument(
                             source=DocumentSource.ConsumeFolder,
-                            original_file=filepath,
+                            original_file=version_filepath,
                         ),
                         overrides,
                     ),
@@ -714,7 +843,7 @@ def edit_pdf(
                 group(consume_tasks).delay()
 
     except Exception as e:
-        logger.exception(f"Error editing document {doc.id}: {e}")
+        logger.exception(f"Error editing document {root_doc.id}: {e}")
         raise ValueError(
             f"An error occurred while editing the document: {e}",
         ) from e
@@ -737,38 +866,61 @@ def remove_password(
     import pikepdf
 
     for doc_id in doc_ids:
-        doc = Document.objects.get(id=doc_id)
+        doc = Document.objects.select_related("root_document").get(id=doc_id)
+        root_doc: Document
+        if doc.root_document_id is None or doc.root_document is None:
+            root_doc = doc
+        else:
+            root_doc = doc.root_document
+
+        source_doc = (
+            Document.objects.filter(Q(id=root_doc.id) | Q(root_document=root_doc))
+            .order_by("-id")
+            .first()
+        )
+        if source_doc is None:
+            source_doc = root_doc
         try:
             logger.info(
                 f"Attempting password removal from document {doc_ids[0]}",
             )
-            with pikepdf.open(doc.source_path, password=password) as pdf:
-                temp_path = doc.source_path.with_suffix(".tmp.pdf")
+            with pikepdf.open(source_doc.source_path, password=password) as pdf:
+                filepath: Path = (
+                    Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
+                    / f"{root_doc.id}_unprotected.pdf"
+                )
                 pdf.remove_unreferenced_resources()
-                pdf.save(temp_path)
+                pdf.save(filepath)
 
                 if update_document:
-                    # replace the original document with the unprotected one
-                    temp_path.replace(doc.source_path)
-                    doc.checksum = hashlib.md5(doc.source_path.read_bytes()).hexdigest()
-                    doc.page_count = len(pdf.pages)
-                    doc.save()
-                    update_document_content_maybe_archive_file.delay(document_id=doc.id)
-                else:
-                    consume_tasks = []
+                    # Create a new version rather than modifying the root/original in place.
                     overrides = (
-                        DocumentMetadataOverrides().from_document(doc)
+                        DocumentMetadataOverrides().from_document(root_doc)
                         if include_metadata
                         else DocumentMetadataOverrides()
                     )
                     if user is not None:
                         overrides.owner_id = user.id
-
-                    filepath: Path = (
-                        Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR))
-                        / f"{doc.id}_unprotected.pdf"
+                        overrides.actor_id = user.id
+                    consume_file.delay(
+                        ConsumableDocument(
+                            source=DocumentSource.ConsumeFolder,
+                            original_file=filepath,
+                            root_document_id=root_doc.id,
+                        ),
+                        overrides,
                     )
-                    temp_path.replace(filepath)
+                else:
+                    consume_tasks = []
+                    overrides = (
+                        DocumentMetadataOverrides().from_document(root_doc)
+                        if include_metadata
+                        else DocumentMetadataOverrides()
+                    )
+                    if user is not None:
+                        overrides.owner_id = user.id
+                        overrides.actor_id = user.id
+
                     consume_tasks.append(
                         consume_file.s(
                             ConsumableDocument(
@@ -780,12 +932,17 @@ def remove_password(
                     )
 
                     if delete_original:
-                        chord(header=consume_tasks, body=delete.si([doc.id])).delay()
+                        chord(
+                            header=consume_tasks,
+                            body=delete.si([doc.id]),
+                        ).delay()
                     else:
                         group(consume_tasks).delay()
 
         except Exception as e:
-            logger.exception(f"Error removing password from document {doc.id}: {e}")
+            logger.exception(
+                f"Error removing password from document {root_doc.id}: {e}",
+            )
             raise ValueError(
                 f"An error occurred while removing the password: {e}",
             ) from e

src/documents/conditionals.py

@@ -1,5 +1,6 @@
 from datetime import datetime
 from datetime import timezone
+from typing import Any
 
 from django.conf import settings
 from django.core.cache import cache
@@ -14,6 +15,59 @@ from documents.classifier import DocumentClassifier
 from documents.models import Document
 
 
+def _resolve_effective_doc(pk: int, request) -> Document | None:
+    """
+    Resolve which Document row should be considered for caching keys:
+    - If a version is requested, use that version
+    - If pk is a root doc, use its newest child version if present, else the root.
+    - Else, pk is a version, use that version.
+    Returns None if resolution fails (treat as no-cache).
+    """
+    try:
+        request_doc = Document.objects.only("id", "root_document_id").get(pk=pk)
+    except Document.DoesNotExist:
+        return None
+
+    root_doc = (
+        request_doc
+        if request_doc.root_document_id is None
+        else Document.objects.only("id").get(id=request_doc.root_document_id)
+    )
+
+    version_param = (
+        request.query_params.get("version")
+        if hasattr(request, "query_params")
+        else None
+    )
+    if version_param:
+        try:
+            version_id = int(version_param)
+            candidate = Document.objects.only("id", "root_document_id").get(
+                id=version_id,
+            )
+            if (
+                candidate.id != root_doc.id
+                and candidate.root_document_id != root_doc.id
+            ):
+                return None
+            return candidate
+        except Exception:
+            return None
+
+    # Default behavior: if pk is a root doc, prefer its newest child version
+    if request_doc.root_document_id is None:
+        latest = (
+            Document.objects.filter(root_document=root_doc)
+            .only("id")
+            .order_by("id")
+            .last()
+        )
+        return latest or root_doc
+
+    # pk is already a version
+    return request_doc
+
+
 def suggestions_etag(request, pk: int) -> str | None:
     """
     Returns an optional string for the ETag, allowing browser caching of
@@ -71,12 +125,10 @@ def metadata_etag(request, pk: int) -> str | None:
     Metadata is extracted from the original file, so use its checksum as the
     ETag
     """
-    try:
-        doc = Document.objects.only("checksum").get(pk=pk)
+    doc = _resolve_effective_doc(pk, request)
+    if doc is None:
+        return None
     return doc.checksum
-    except Document.DoesNotExist:  # pragma: no cover
-        return None
-    return None
 
 
 def metadata_last_modified(request, pk: int) -> datetime | None:
@@ -85,28 +137,25 @@ def metadata_last_modified(request, pk: int) -> datetime | None:
     not the modification of the original file, but of the database object, but might as well
     error on the side of more cautious
     """
-    try:
-        doc = Document.objects.only("modified").get(pk=pk)
+    doc = _resolve_effective_doc(pk, request)
+    if doc is None:
+        return None
     return doc.modified
-    except Document.DoesNotExist:  # pragma: no cover
-        return None
-    return None
 
 
 def preview_etag(request, pk: int) -> str | None:
     """
     ETag for the document preview, using the original or archive checksum, depending on the request
     """
-    try:
-        doc = Document.objects.only("checksum", "archive_checksum").get(pk=pk)
+    doc = _resolve_effective_doc(pk, request)
+    if doc is None:
+        return None
     use_original = (
-            "original" in request.query_params
+        hasattr(request, "query_params")
+        and "original" in request.query_params
         and request.query_params["original"] == "true"
     )
     return doc.checksum if use_original else doc.archive_checksum
-    except Document.DoesNotExist:  # pragma: no cover
-        return None
-    return None
 
 
 def preview_last_modified(request, pk: int) -> datetime | None:
@@ -114,24 +163,25 @@ def preview_last_modified(request, pk: int) -> datetime | None:
     Uses the documents modified time to set the Last-Modified header.  Not strictly
     speaking correct, but close enough and quick
     """
-    try:
-        doc = Document.objects.only("modified").get(pk=pk)
+    doc = _resolve_effective_doc(pk, request)
+    if doc is None:
+        return None
     return doc.modified
-    except Document.DoesNotExist:  # pragma: no cover
-        return None
-    return None
 
 
-def thumbnail_last_modified(request, pk: int) -> datetime | None:
+def thumbnail_last_modified(request: Any, pk: int) -> datetime | None:
     """
     Returns the filesystem last modified either from cache or from filesystem.
     Cache should be (slightly?) faster than filesystem
     """
     try:
-        doc = Document.objects.only("pk").get(pk=pk)
+        doc = _resolve_effective_doc(pk, request)
+        if doc is None:
+            return None
         if not doc.thumbnail_path.exists():
             return None
-        doc_key = get_thumbnail_modified_key(pk)
+        # Use the effective document id for cache key
+        doc_key = get_thumbnail_modified_key(doc.id)
 
         cache_hit = cache.get(doc_key)
         if cache_hit is not None:

src/documents/consumer.py

@@ -102,6 +102,12 @@ class ConsumerStatusShortMessage(str, Enum):
 
 
 class ConsumerPluginMixin:
+    if TYPE_CHECKING:
+        from logging import Logger
+        from logging import LoggerAdapter
+
+        log: "LoggerAdapter"  # type: ignore[type-arg]
+
     def __init__(
         self,
         input_doc: ConsumableDocument,
@@ -116,6 +122,14 @@ class ConsumerPluginMixin:
 
         self.filename = self.metadata.filename or self.input_doc.original_file.name
 
+        if input_doc.root_document_id:
+            self.log.debug(
+                f"Document root document id: {input_doc.root_document_id}",
+            )
+            root_document = Document.objects.get(pk=input_doc.root_document_id)
+            version_index = Document.objects.filter(root_document=root_document).count()
+            self.filename += f"_v{version_index}"
+
     def _send_progress(
         self,
         current_progress: int,
@@ -477,6 +491,80 @@ class ConsumerPlugin(
         try:
             with transaction.atomic():
                 # store the document.
+                if self.input_doc.root_document_id:
+                    # If this is a new version of an existing document, we need
+                    # to make sure we're not creating a new document, but updating
+                    # the existing one.
+                    root_doc = Document.objects.get(
+                        pk=self.input_doc.root_document_id,
+                    )
+                    original_document = Document.objects.get(
+                        pk=self.input_doc.root_document_id,
+                    )
+                    self.log.debug("Saving record for updated version to database")
+                    setattr(original_document, "pk", None)
+                    original_document.root_document = root_doc
+                    file_for_checksum = (
+                        self.unmodified_original
+                        if self.unmodified_original is not None
+                        else self.working_copy
+                    )
+                    original_document.checksum = hashlib.md5(
+                        file_for_checksum.read_bytes(),
+                    ).hexdigest()
+                    original_document.content = ""
+                    original_document.page_count = page_count
+                    original_document.mime_type = mime_type
+                    original_document.original_filename = self.filename
+                    original_document.storage_path = root_doc.storage_path
+                    # Clear unique file path fields so they can be generated uniquely later
+                    original_document.filename = None
+                    original_document.archive_filename = None
+                    original_document.archive_checksum = None
+                    if self.metadata.version_label is not None:
+                        original_document.version_label = self.metadata.version_label
+                    original_document.added = timezone.now()
+                    original_document.modified = timezone.now()
+                    actor = None
+
+                    # Save the new version, potentially creating an audit log entry for the version addition if enabled.
+                    if (
+                        settings.AUDIT_LOG_ENABLED
+                        and self.metadata.actor_id is not None
+                    ):
+                        actor = User.objects.filter(pk=self.metadata.actor_id).first()
+                        if actor is not None:
+                            from auditlog.context import (  # type: ignore[import-untyped]
+                                set_actor,
+                            )
+
+                            with set_actor(actor):
+                                original_document.save()
+                        else:
+                            original_document.save()
+                    else:
+                        original_document.save()
+
+                    # Create a log entry for the version addition, if enabled
+                    if settings.AUDIT_LOG_ENABLED:
+                        from auditlog.models import (  # type: ignore[import-untyped]
+                            LogEntry,
+                        )
+
+                        LogEntry.objects.log_create(
+                            instance=root_doc,
+                            changes={
+                                "Version Added": ["None", original_document.id],
+                            },
+                            action=LogEntry.Action.UPDATE,
+                            actor=actor,
+                            additional_data={
+                                "reason": "Version added",
+                                "version_id": original_document.id,
+                            },
+                        )
+                    document = original_document
+                else:
                     document = self._store(
                         text=text,
                         date=date,
@@ -700,6 +788,9 @@ class ConsumerPlugin(
         if self.metadata.asn is not None:
             document.archive_serial_number = self.metadata.asn
 
+        if self.metadata.version_label is not None:
+            document.version_label = self.metadata.version_label
+
         if self.metadata.owner_id:
             document.owner = User.objects.get(
                 pk=self.metadata.owner_id,

src/documents/data_models.py

@@ -31,6 +31,8 @@ class DocumentMetadataOverrides:
     change_groups: list[int] | None = None
     custom_fields: dict | None = None
     skip_asn_if_exists: bool = False
+    version_label: str | None = None
+    actor_id: int | None = None
 
     def update(self, other: "DocumentMetadataOverrides") -> "DocumentMetadataOverrides":
         """
@@ -50,8 +52,12 @@ class DocumentMetadataOverrides:
             self.storage_path_id = other.storage_path_id
         if other.owner_id is not None:
             self.owner_id = other.owner_id
+        if other.actor_id is not None:
+            self.actor_id = other.actor_id
         if other.skip_asn_if_exists:
             self.skip_asn_if_exists = True
+        if other.version_label is not None:
+            self.version_label = other.version_label
 
         # merge
         if self.tag_ids is None:
@@ -160,6 +166,7 @@ class ConsumableDocument:
 
     source: DocumentSource
     original_file: Path
+    root_document_id: int | None = None
     original_path: Path | None = None
     mailrule_id: int | None = None
     mime_type: str = dataclasses.field(init=False, default=None)

src/documents/migrations/0012_document_root_document.py

@@ -0,0 +1,37 @@
+# Generated by Django 5.1.6 on 2025-02-26 17:08
+
+import django.db.models.deletion
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("documents", "0011_optimize_integer_field_sizes"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="document",
+            name="root_document",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="versions",
+                to="documents.document",
+                verbose_name="root document for this version",
+            ),
+        ),
+        migrations.AddField(
+            model_name="document",
+            name="version_label",
+            field=models.CharField(
+                blank=True,
+                help_text="Optional short label for a document version.",
+                max_length=64,
+                null=True,
+                verbose_name="version label",
+            ),
+        ),
+    ]

src/documents/models.py

@@ -155,7 +155,7 @@ class StoragePath(MatchingModel):
         verbose_name_plural = _("storage paths")
 
 
-class Document(SoftDeleteModel, ModelWithOwner):
+class Document(SoftDeleteModel, ModelWithOwner):  # type: ignore[django-manager-missing]
     correspondent = models.ForeignKey(
         Correspondent,
         blank=True,
@@ -308,6 +308,23 @@ class Document(SoftDeleteModel, ModelWithOwner):
         ),
     )
 
+    root_document = models.ForeignKey(
+        "self",
+        blank=True,
+        null=True,
+        related_name="versions",
+        on_delete=models.CASCADE,
+        verbose_name=_("root document for this version"),
+    )
+
+    version_label = models.CharField(
+        _("version label"),
+        max_length=64,
+        blank=True,
+        null=True,
+        help_text=_("Optional short label for a document version."),
+    )
+
     class Meta:
         ordering = ("-created",)
         verbose_name = _("document")
@@ -419,6 +436,19 @@ class Document(SoftDeleteModel, ModelWithOwner):
         tags_to_add = self.tags.model.objects.filter(id__in=tag_ids)
         self.tags.add(*tags_to_add)
 
+    def delete(
+        self,
+        *args,
+        **kwargs,
+    ):
+        # If deleting a root document, move all its versions to trash as well.
+        if self.root_document_id is None:
+            Document.objects.filter(root_document=self).delete()
+        return super().delete(
+            *args,
+            **kwargs,
+        )
+
 
 class SavedView(ModelWithOwner):
     class DisplayMode(models.TextChoices):
@@ -1712,5 +1742,5 @@ class WorkflowRun(SoftDeleteModel):
         verbose_name = _("workflow run")
         verbose_name_plural = _("workflow runs")
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f"WorkflowRun of {self.workflow} at {self.run_at} on {self.document}"

src/documents/serialisers.py

@@ -7,7 +7,9 @@ from datetime import datetime
 from datetime import timedelta
 from decimal import Decimal
 from typing import TYPE_CHECKING
+from typing import Any
 from typing import Literal
+from typing import TypedDict
 
 import magic
 from celery import states
@@ -89,6 +91,8 @@ if TYPE_CHECKING:
     from collections.abc import Iterable
 
     from django.db.models.query import QuerySet
+    from rest_framework.relations import ManyRelatedField
+    from rest_framework.relations import RelatedField
 
 
 logger = logging.getLogger("paperless.serializers")
@@ -1046,6 +1050,7 @@ def _get_viewable_duplicates(
     duplicates = Document.global_objects.filter(
         Q(checksum__in=checksums) | Q(archive_checksum__in=checksums),
     ).exclude(pk=document.pk)
+    duplicates = duplicates.filter(root_document__isnull=True)
     duplicates = duplicates.order_by("-created")
     allowed = get_objects_for_user_owner_aware(
         user,
@@ -1062,6 +1067,22 @@ class DuplicateDocumentSummarySerializer(serializers.Serializer):
     deleted_at = serializers.DateTimeField(allow_null=True)
 
 
+class DocumentVersionInfoSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    added = serializers.DateTimeField()
+    version_label = serializers.CharField(required=False, allow_null=True)
+    checksum = serializers.CharField(required=False, allow_null=True)
+    is_root = serializers.BooleanField()
+
+
+class _DocumentVersionInfo(TypedDict):
+    id: int
+    added: datetime
+    version_label: str | None
+    checksum: str | None
+    is_root: bool
+
+
 @extend_schema_serializer(
     deprecate_fields=["created_date"],
 )
@@ -1082,6 +1103,10 @@ class DocumentSerializer(
     duplicate_documents = SerializerMethodField()
 
     notes = NotesSerializer(many=True, required=False, read_only=True)
+    root_document: RelatedField[Document, Document, Any] | ManyRelatedField = (
+        serializers.PrimaryKeyRelatedField(read_only=True)
+    )
+    versions = SerializerMethodField()
 
     custom_fields = CustomFieldInstanceSerializer(
         many=True,
@@ -1115,6 +1140,32 @@ class DocumentSerializer(
         duplicates = _get_viewable_duplicates(obj, user)
         return list(duplicates.values("id", "title", "deleted_at"))
 
+    @extend_schema_field(DocumentVersionInfoSerializer(many=True))
+    def get_versions(self, obj):
+        root_doc = obj if obj.root_document_id is None else obj.root_document
+        if root_doc is None:
+            return []
+        versions_qs = Document.objects.filter(root_document=root_doc).only(
+            "id",
+            "added",
+            "checksum",
+            "version_label",
+        )
+        versions = [*versions_qs, root_doc]
+
+        def build_info(doc: Document) -> _DocumentVersionInfo:
+            return {
+                "id": doc.id,
+                "added": doc.added,
+                "version_label": doc.version_label,
+                "checksum": doc.checksum,
+                "is_root": doc.id == root_doc.id,
+            }
+
+        info = [build_info(doc) for doc in versions]
+        info.sort(key=lambda item: item["id"], reverse=True)
+        return info
+
     def get_original_file_name(self, obj) -> str | None:
         return obj.original_filename
 
@@ -1303,6 +1354,8 @@ class DocumentSerializer(
             "remove_inbox_tags",
             "page_count",
             "mime_type",
+            "root_document",
+            "versions",
         )
         list_serializer_class = OwnedObjectListSerializer
 
@@ -1997,6 +2050,22 @@ class PostDocumentSerializer(serializers.Serializer):
             return created.date()
 
 
+class DocumentVersionSerializer(serializers.Serializer):
+    document = serializers.FileField(
+        label="Document",
+        write_only=True,
+    )
+    version_label = serializers.CharField(
+        label="Version label",
+        required=False,
+        allow_blank=True,
+        allow_null=True,
+        max_length=64,
+    )
+
+    validate_document = PostDocumentSerializer().validate_document
+
+
 class BulkDownloadSerializer(DocumentListSerializer):
     content = serializers.ChoiceField(
         choices=["archive", "originals", "both"],
@@ -2196,7 +2265,7 @@ class TasksViewSerializer(OwnedObjectSerializer):
         return list(duplicates.values("id", "title", "deleted_at"))
 
 
-class RunTaskViewSerializer(serializers.Serializer):
+class RunTaskViewSerializer(serializers.Serializer[dict[str, Any]]):
     task_name = serializers.ChoiceField(
         choices=PaperlessTask.TaskName.choices,
         label="Task Name",
@@ -2204,7 +2273,7 @@ class RunTaskViewSerializer(serializers.Serializer):
     )
 
 
-class AcknowledgeTasksViewSerializer(serializers.Serializer):
+class AcknowledgeTasksViewSerializer(serializers.Serializer[dict[str, Any]]):
     tasks = serializers.ListField(
         required=True,
         label="Tasks",
@@ -2951,7 +3020,7 @@ class TrashSerializer(SerializerWithPerms):
         write_only=True,
     )
 
-    def validate_documents(self, documents):
+    def validate_documents(self, documents: list[int]) -> list[int]:
         count = Document.deleted_objects.filter(id__in=documents).count()
         if not count == len(documents):
             raise serializers.ValidationError(

src/documents/tasks.py

@@ -156,7 +156,10 @@ def consume_file(
     if overrides is None:
         overrides = DocumentMetadataOverrides()
 
-    plugins: list[type[ConsumeTaskPlugin]] = [
+    plugins: list[type[ConsumeTaskPlugin]] = (
+        [ConsumerPreflightPlugin, ConsumerPlugin]
+        if input_doc.root_document_id is not None
+        else [
             ConsumerPreflightPlugin,
             AsnCheckPlugin,
             CollatePlugin,
@@ -165,6 +168,7 @@ def consume_file(
             WorkflowTriggerPlugin,
             ConsumerPlugin,
         ]
+    )
 
     with (
         ProgressManager(

src/documents/tests/test_api_document_versions.py

@@ -0,0 +1,257 @@
+from __future__ import annotations
+
+from unittest import mock
+
+from auditlog.models import LogEntry  # type: ignore[import-untyped]
+from django.contrib.auth.models import User
+from django.contrib.contenttypes.models import ContentType
+from django.core.files.uploadedfile import SimpleUploadedFile
+from rest_framework import status
+from rest_framework.test import APITestCase
+
+from documents.data_models import DocumentSource
+from documents.models import Document
+from documents.tests.utils import DirectoriesMixin
+
+
+class TestDocumentVersioningApi(DirectoriesMixin, APITestCase):
+    def setUp(self) -> None:
+        super().setUp()
+
+        self.user = User.objects.create_superuser(username="temp_admin")
+        self.client.force_authenticate(user=self.user)
+
+    def _make_pdf_upload(self, name: str = "version.pdf") -> SimpleUploadedFile:
+        return SimpleUploadedFile(
+            name,
+            b"%PDF-1.4\n1 0 obj\n<<>>\nendobj\n%%EOF",
+            content_type="application/pdf",
+        )
+
+    def test_root_endpoint_returns_root_for_version_and_root(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        version = Document.objects.create(
+            title="v1",
+            checksum="v1",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+
+        resp_root = self.client.get(f"/api/documents/{root.id}/root/")
+        self.assertEqual(resp_root.status_code, status.HTTP_200_OK)
+        self.assertEqual(resp_root.data["root_id"], root.id)
+
+        resp_version = self.client.get(f"/api/documents/{version.id}/root/")
+        self.assertEqual(resp_version.status_code, status.HTTP_200_OK)
+        self.assertEqual(resp_version.data["root_id"], root.id)
+
+    def test_delete_version_disallows_deleting_root(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(f"/api/documents/{root.id}/versions/{root.id}/")
+
+        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertTrue(Document.objects.filter(id=root.id).exists())
+
+    def test_delete_version_deletes_version_and_returns_current_version(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        v1 = Document.objects.create(
+            title="v1",
+            checksum="v1",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+        v2 = Document.objects.create(
+            title="v2",
+            checksum="v2",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(f"/api/documents/{root.id}/versions/{v2.id}/")
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertFalse(Document.objects.filter(id=v2.id).exists())
+        self.assertEqual(resp.data["current_version_id"], v1.id)
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(f"/api/documents/{root.id}/versions/{v1.id}/")
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertFalse(Document.objects.filter(id=v1.id).exists())
+        self.assertEqual(resp.data["current_version_id"], root.id)
+
+    def test_delete_version_writes_audit_log_entry(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        version = Document.objects.create(
+            title="v1",
+            checksum="v1",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+        version_id = version.id
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(
+                f"/api/documents/{root.id}/versions/{version_id}/",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+
+        # Audit log entry is created against the root document.
+        entry = (
+            LogEntry.objects.filter(
+                content_type=ContentType.objects.get_for_model(Document),
+                object_id=root.id,
+            )
+            .order_by("-timestamp")
+            .first()
+        )
+        self.assertIsNotNone(entry)
+        assert entry is not None
+        self.assertIsNotNone(entry.actor)
+        assert entry.actor is not None
+        self.assertEqual(entry.actor.id, self.user.id)
+        self.assertEqual(entry.action, LogEntry.Action.UPDATE)
+        self.assertEqual(
+            entry.changes,
+            {"Version Deleted": ["None", version_id]},
+        )
+        additional_data = entry.additional_data or {}
+        self.assertEqual(additional_data.get("version_id"), version_id)
+
+    def test_delete_version_returns_404_when_version_not_related(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        other_root = Document.objects.create(
+            title="other",
+            checksum="other",
+            mime_type="application/pdf",
+        )
+        other_version = Document.objects.create(
+            title="other-v1",
+            checksum="other-v1",
+            mime_type="application/pdf",
+            root_document=other_root,
+        )
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(
+                f"/api/documents/{root.id}/versions/{other_version.id}/",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_delete_version_accepts_version_id_as_root_parameter(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        version = Document.objects.create(
+            title="v1",
+            checksum="v1",
+            mime_type="application/pdf",
+            root_document=root,
+        )
+
+        with mock.patch("documents.index.remove_document_from_index"):
+            resp = self.client.delete(
+                f"/api/documents/{version.id}/versions/{version.id}/",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertFalse(Document.objects.filter(id=version.id).exists())
+        self.assertEqual(resp.data["current_version_id"], root.id)
+
+    def test_update_version_enqueues_consume_with_overrides(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+        upload = self._make_pdf_upload()
+
+        async_task = mock.Mock()
+        async_task.id = "task-123"
+
+        with mock.patch("documents.views.consume_file") as consume_mock:
+            consume_mock.delay.return_value = async_task
+            resp = self.client.post(
+                f"/api/documents/{root.id}/update_version/",
+                {"document": upload, "version_label": "  New Version  "},
+                format="multipart",
+            )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        self.assertEqual(resp.data, "task-123")
+        consume_mock.delay.assert_called_once()
+        input_doc, overrides = consume_mock.delay.call_args[0]
+        self.assertEqual(input_doc.root_document_id, root.id)
+        self.assertEqual(input_doc.source, DocumentSource.ApiUpload)
+        self.assertEqual(overrides.version_label, "New Version")
+        self.assertEqual(overrides.actor_id, self.user.id)
+
+    def test_update_version_returns_403_without_permission(self) -> None:
+        owner = User.objects.create_user(username="owner")
+        other = User.objects.create_user(username="other")
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+            owner=owner,
+        )
+        self.client.force_authenticate(user=other)
+
+        resp = self.client.post(
+            f"/api/documents/{root.id}/update_version/",
+            {"document": self._make_pdf_upload()},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_403_FORBIDDEN)
+
+    def test_update_version_returns_404_for_missing_document(self) -> None:
+        resp = self.client.post(
+            "/api/documents/9999/update_version/",
+            {"document": self._make_pdf_upload()},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_update_version_requires_document(self) -> None:
+        root = Document.objects.create(
+            title="root",
+            checksum="root",
+            mime_type="application/pdf",
+        )
+
+        resp = self.client.post(
+            f"/api/documents/{root.id}/update_version/",
+            {"version_label": "label"},
+            format="multipart",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)

src/documents/tests/test_api_documents.py

@@ -554,6 +554,36 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
         self.assertIsNone(response.data[1]["actor"])
         self.assertEqual(response.data[1]["action"], "create")
 
+    def test_document_history_logs_version_deletion(self) -> None:
+        root_doc = Document.objects.create(
+            title="Root",
+            checksum="123",
+            mime_type="application/pdf",
+            owner=self.user,
+        )
+        version_doc = Document.objects.create(
+            title="Version",
+            checksum="456",
+            mime_type="application/pdf",
+            root_document=root_doc,
+            owner=self.user,
+        )
+
+        response = self.client.delete(
+            f"/api/documents/{root_doc.pk}/versions/{version_doc.pk}/",
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+        response = self.client.get(f"/api/documents/{root_doc.pk}/history/")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.data), 2)
+        self.assertEqual(response.data[0]["actor"]["id"], self.user.id)
+        self.assertEqual(response.data[0]["action"], "update")
+        self.assertEqual(
+            response.data[0]["changes"],
+            {"Version Deleted": ["None", version_doc.pk]},
+        )
+
     @override_settings(AUDIT_LOG_ENABLED=False)
     def test_document_history_action_disabled(self) -> None:
         """

src/documents/tests/test_barcodes.py

@@ -4,6 +4,7 @@ from contextlib import contextmanager
 from pathlib import Path
 from unittest import mock
 
+import pytest
 from django.conf import settings
 from django.test import TestCase
 from django.test import override_settings
@@ -24,6 +25,13 @@ from documents.tests.utils import FileSystemAssertsMixin
 from documents.tests.utils import SampleDirMixin
 from paperless.models import ApplicationConfiguration
 
+try:
+    import zxingcpp  # noqa: F401
+
+    HAS_ZXING_LIB = True
+except ImportError:
+    HAS_ZXING_LIB = False
+
 
 class GetReaderPluginMixin:
     @contextmanager
@@ -40,6 +48,7 @@ class GetReaderPluginMixin:
         reader.cleanup()
 
 
+@override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
 class TestBarcode(
     DirectoriesMixin,
     FileSystemAssertsMixin,
@@ -597,6 +606,7 @@ class TestBarcode(
             self.assertDictEqual(separator_page_numbers, {0: False})
 
 
+@override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
 class TestBarcodeNewConsume(
     DirectoriesMixin,
     FileSystemAssertsMixin,
@@ -774,23 +784,25 @@ class TestAsnBarcode(DirectoriesMixin, SampleDirMixin, GetReaderPluginMixin, Tes
 
             self.assertEqual(document.archive_serial_number, 123)
 
+    @override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
     def test_scan_file_for_qrcode_without_upscale(self) -> None:
         """
         GIVEN:
             - A printed and scanned PDF document with a rather small QR code
         WHEN:
             - ASN barcode detection is run with default settings
+            - pyzbar is used for detection, as zxing would behave differently, and detect the QR code
         THEN:
-            - ASN 123 is detected
+            - ASN is not detected
         """
 
         test_file = self.BARCODE_SAMPLE_DIR / "barcode-qr-asn-000123-upscale-dpi.pdf"
 
         with self.get_reader(test_file) as reader:
             reader.detect()
-            self.assertEqual(len(reader.barcodes), 1)
-            self.assertEqual(reader.asn, 123)
+            self.assertEqual(len(reader.barcodes), 0)
 
+    @override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
     @override_settings(CONSUMER_BARCODE_DPI=600)
     @override_settings(CONSUMER_BARCODE_UPSCALE=1.5)
     def test_scan_file_for_qrcode_with_upscale(self) -> None:
@@ -798,7 +810,10 @@ class TestAsnBarcode(DirectoriesMixin, SampleDirMixin, GetReaderPluginMixin, Tes
         GIVEN:
             - A printed and scanned PDF document with a rather small QR code
         WHEN:
-            - ASN barcode detection is run with 600dpi and an upscale factor of 1.5
+            - ASN barcode detection is run with 600dpi and an upscale factor of 1.5 and pyzbar
+            - pyzbar is used for detection, as zxing would behave differently.
+              Upscaling is a workaround for detection problems with pyzbar,
+              when you cannot switch to zxing (aarch64 build problems of zxing)
         THEN:
             - ASN 123 is detected
         """
@@ -811,6 +826,24 @@ class TestAsnBarcode(DirectoriesMixin, SampleDirMixin, GetReaderPluginMixin, Tes
             self.assertEqual(reader.asn, 123)
 
 
+@pytest.mark.skipif(
+    not HAS_ZXING_LIB,
+    reason="No zxingcpp",
+)
+@override_settings(CONSUMER_BARCODE_SCANNER="ZXING")
+class TestBarcodeZxing(TestBarcode):
+    pass
+
+
+@pytest.mark.skipif(
+    not HAS_ZXING_LIB,
+    reason="No zxingcpp",
+)
+@override_settings(CONSUMER_BARCODE_SCANNER="ZXING")
+class TestAsnBarcodesZxing(TestAsnBarcode):
+    pass
+
+
 class TestTagBarcode(DirectoriesMixin, SampleDirMixin, GetReaderPluginMixin, TestCase):
     @contextmanager
     def get_reader(self, filepath: Path) -> BarcodePlugin:

src/documents/tests/test_bulk_edit.py

@@ -1,4 +1,3 @@
-import hashlib
 import shutil
 from datetime import date
 from pathlib import Path
@@ -922,15 +921,8 @@ class TestPDFActions(DirectoriesMixin, TestCase):
 
         mock_consume_file.assert_not_called()
 
-    @mock.patch("documents.tasks.bulk_update_documents.si")
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.s")
-    @mock.patch("celery.chord.delay")
-    def test_rotate(
-        self,
-        mock_chord,
-        mock_update_document,
-        mock_update_documents,
-    ) -> None:
+    @mock.patch("documents.tasks.consume_file.delay")
+    def test_rotate(self, mock_consume_delay):
         """
         GIVEN:
             - Existing documents
@@ -941,19 +933,22 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         """
         doc_ids = [self.doc1.id, self.doc2.id]
         result = bulk_edit.rotate(doc_ids, 90)
-        self.assertEqual(mock_update_document.call_count, 2)
-        mock_update_documents.assert_called_once()
-        mock_chord.assert_called_once()
+        self.assertEqual(mock_consume_delay.call_count, 2)
+        for call, expected_id in zip(
+            mock_consume_delay.call_args_list,
+            doc_ids,
+        ):
+            consumable, overrides = call.args
+            self.assertEqual(consumable.root_document_id, expected_id)
+            self.assertIsNotNone(overrides)
         self.assertEqual(result, "OK")
 
-    @mock.patch("documents.tasks.bulk_update_documents.si")
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.s")
+    @mock.patch("documents.tasks.consume_file.delay")
     @mock.patch("pikepdf.Pdf.save")
     def test_rotate_with_error(
         self,
         mock_pdf_save,
-        mock_update_archive_file,
-        mock_update_documents,
+        mock_consume_delay,
     ):
         """
         GIVEN:
@@ -972,16 +967,12 @@ class TestPDFActions(DirectoriesMixin, TestCase):
             error_str = cm.output[0]
             expected_str = "Error rotating document"
             self.assertIn(expected_str, error_str)
-            mock_update_archive_file.assert_not_called()
+            mock_consume_delay.assert_not_called()
 
-    @mock.patch("documents.tasks.bulk_update_documents.si")
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.s")
-    @mock.patch("celery.chord.delay")
+    @mock.patch("documents.tasks.consume_file.delay")
     def test_rotate_non_pdf(
         self,
-        mock_chord,
-        mock_update_document,
-        mock_update_documents,
+        mock_consume_delay,
     ):
         """
         GIVEN:
@@ -993,17 +984,18 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         """
         with self.assertLogs("paperless.bulk_edit", level="INFO") as cm:
             result = bulk_edit.rotate([self.doc2.id, self.img_doc.id], 90)
-            output_str = cm.output[1]
-            expected_str = "Document 4 is not a PDF, skipping rotation"
-            self.assertIn(expected_str, output_str)
-            self.assertEqual(mock_update_document.call_count, 1)
-            mock_update_documents.assert_called_once()
-            mock_chord.assert_called_once()
+            expected_str = f"Document {self.img_doc.id} is not a PDF, skipping rotation"
+            self.assertTrue(any(expected_str in line for line in cm.output))
+            self.assertEqual(mock_consume_delay.call_count, 1)
+            consumable, overrides = mock_consume_delay.call_args[0]
+            self.assertEqual(consumable.root_document_id, self.doc2.id)
+            self.assertIsNotNone(overrides)
             self.assertEqual(result, "OK")
 
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.delay")
+    @mock.patch("documents.tasks.consume_file.delay")
     @mock.patch("pikepdf.Pdf.save")
-    def test_delete_pages(self, mock_pdf_save, mock_update_archive_file) -> None:
+    @mock.patch("documents.data_models.magic.from_file", return_value="application/pdf")
+    def test_delete_pages(self, mock_magic, mock_pdf_save, mock_consume_delay):
         """
         GIVEN:
             - Existing documents
@@ -1011,28 +1003,22 @@ class TestPDFActions(DirectoriesMixin, TestCase):
             - Delete pages action is called with 1 document and 2 pages
         THEN:
             - Save should be called once
-            - Archive file should be updated once
-            - The document's page_count should be reduced by the number of deleted pages
+            - A new version should be enqueued via consume_file
         """
         doc_ids = [self.doc2.id]
-        initial_page_count = self.doc2.page_count
         pages = [1, 3]
         result = bulk_edit.delete_pages(doc_ids, pages)
         mock_pdf_save.assert_called_once()
-        mock_update_archive_file.assert_called_once()
+        mock_consume_delay.assert_called_once()
+        consumable, overrides = mock_consume_delay.call_args[0]
+        self.assertEqual(consumable.root_document_id, self.doc2.id)
+        self.assertTrue(str(consumable.original_file).endswith("_pages_deleted.pdf"))
+        self.assertIsNotNone(overrides)
         self.assertEqual(result, "OK")
 
-        expected_page_count = initial_page_count - len(pages)
-        self.doc2.refresh_from_db()
-        self.assertEqual(self.doc2.page_count, expected_page_count)
-
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.delay")
+    @mock.patch("documents.tasks.consume_file.delay")
     @mock.patch("pikepdf.Pdf.save")
-    def test_delete_pages_with_error(
-        self,
-        mock_pdf_save,
-        mock_update_archive_file,
-    ) -> None:
+    def test_delete_pages_with_error(self, mock_pdf_save, mock_consume_delay):
         """
         GIVEN:
             - Existing documents
@@ -1041,7 +1027,7 @@ class TestPDFActions(DirectoriesMixin, TestCase):
             - PikePDF raises an error
         THEN:
             - Save should be called once
-            - Archive file should not be updated
+            - No new version should be enqueued
         """
         mock_pdf_save.side_effect = Exception("Error saving PDF")
         doc_ids = [self.doc2.id]
@@ -1052,7 +1038,7 @@ class TestPDFActions(DirectoriesMixin, TestCase):
             error_str = cm.output[0]
             expected_str = "Error deleting pages from document"
             self.assertIn(expected_str, error_str)
-            mock_update_archive_file.assert_not_called()
+            mock_consume_delay.assert_not_called()
 
     @mock.patch("documents.bulk_edit.group")
     @mock.patch("documents.tasks.consume_file.s")
@@ -1151,24 +1137,18 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         self.doc2.refresh_from_db()
         self.assertEqual(self.doc2.archive_serial_number, 333)
 
-    @mock.patch("documents.tasks.update_document_content_maybe_archive_file.delay")
-    def test_edit_pdf_with_update_document(
-        self,
-        mock_update_document: mock.Mock,
-    ) -> None:
+    @mock.patch("documents.tasks.consume_file.delay")
+    def test_edit_pdf_with_update_document(self, mock_consume_delay):
         """
         GIVEN:
             - A single existing PDF document
         WHEN:
             - edit_pdf is called with update_document=True and a single output
         THEN:
-            - The original document is updated in-place
-            - The update_document_content_maybe_archive_file task is triggered
+            - A version update is enqueued targeting the existing document
         """
         doc_ids = [self.doc2.id]
         operations = [{"page": 1}, {"page": 2}]
-        original_checksum = self.doc2.checksum
-        original_page_count = self.doc2.page_count
 
         result = bulk_edit.edit_pdf(
             doc_ids,
@@ -1178,10 +1158,11 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         )
 
         self.assertEqual(result, "OK")
-        self.doc2.refresh_from_db()
-        self.assertNotEqual(self.doc2.checksum, original_checksum)
-        self.assertNotEqual(self.doc2.page_count, original_page_count)
-        mock_update_document.assert_called_once_with(document_id=self.doc2.id)
+        mock_consume_delay.assert_called_once()
+        consumable, overrides = mock_consume_delay.call_args[0]
+        self.assertEqual(consumable.root_document_id, self.doc2.id)
+        self.assertTrue(str(consumable.original_file).endswith("_edited.pdf"))
+        self.assertIsNotNone(overrides)
 
     @mock.patch("documents.bulk_edit.group")
     @mock.patch("documents.tasks.consume_file.s")
@@ -1258,10 +1239,20 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         mock_consume_file.assert_not_called()
 
     @mock.patch("documents.bulk_edit.update_document_content_maybe_archive_file.delay")
+    @mock.patch("documents.tasks.consume_file.delay")
+    @mock.patch("documents.bulk_edit.tempfile.mkdtemp")
     @mock.patch("pikepdf.open")
-    def test_remove_password_update_document(self, mock_open, mock_update_document):
+    def test_remove_password_update_document(
+        self,
+        mock_open,
+        mock_mkdtemp,
+        mock_consume_delay,
+        mock_update_document,
+    ):
         doc = self.doc1
-        original_checksum = doc.checksum
+        temp_dir = self.dirs.scratch_dir / "remove-password-update"
+        temp_dir.mkdir(parents=True, exist_ok=True)
+        mock_mkdtemp.return_value = str(temp_dir)
 
         fake_pdf = mock.MagicMock()
         fake_pdf.pages = [mock.Mock(), mock.Mock(), mock.Mock()]
@@ -1281,12 +1272,17 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         self.assertEqual(result, "OK")
         mock_open.assert_called_once_with(doc.source_path, password="secret")
         fake_pdf.remove_unreferenced_resources.assert_called_once()
-        doc.refresh_from_db()
-        self.assertNotEqual(doc.checksum, original_checksum)
-        expected_checksum = hashlib.md5(doc.source_path.read_bytes()).hexdigest()
-        self.assertEqual(doc.checksum, expected_checksum)
-        self.assertEqual(doc.page_count, len(fake_pdf.pages))
-        mock_update_document.assert_called_once_with(document_id=doc.id)
+        mock_update_document.assert_not_called()
+        mock_consume_delay.assert_called_once()
+        consumable, overrides = mock_consume_delay.call_args[0]
+        expected_path = temp_dir / f"{doc.id}_unprotected.pdf"
+        self.assertTrue(expected_path.exists())
+        self.assertEqual(
+            Path(consumable.original_file).resolve(),
+            expected_path.resolve(),
+        )
+        self.assertEqual(consumable.root_document_id, doc.id)
+        self.assertIsNotNone(overrides)
 
     @mock.patch("documents.bulk_edit.chord")
     @mock.patch("documents.bulk_edit.group")
@@ -1295,12 +1291,12 @@ class TestPDFActions(DirectoriesMixin, TestCase):
     @mock.patch("pikepdf.open")
     def test_remove_password_creates_consumable_document(
         self,
-        mock_open,
-        mock_mkdtemp,
-        mock_consume_file,
-        mock_group,
-        mock_chord,
-    ):
+        mock_open: mock.Mock,
+        mock_mkdtemp: mock.Mock,
+        mock_consume_file: mock.Mock,
+        mock_group: mock.Mock,
+        mock_chord: mock.Mock,
+    ) -> None:
         doc = self.doc2
         temp_dir = self.dirs.scratch_dir / "remove-password"
         temp_dir.mkdir(parents=True, exist_ok=True)
@@ -1309,8 +1305,8 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         fake_pdf = mock.MagicMock()
         fake_pdf.pages = [mock.Mock(), mock.Mock()]
 
-        def save_side_effect(target_path):
-            Path(target_path).write_bytes(b"password removed")
+        def save_side_effect(target_path: Path) -> None:
+            target_path.write_bytes(b"password removed")
 
         fake_pdf.save.side_effect = save_side_effect
         mock_open.return_value.__enter__.return_value = fake_pdf
@@ -1352,13 +1348,13 @@ class TestPDFActions(DirectoriesMixin, TestCase):
     @mock.patch("pikepdf.open")
     def test_remove_password_deletes_original(
         self,
-        mock_open,
-        mock_mkdtemp,
-        mock_consume_file,
-        mock_group,
-        mock_chord,
-        mock_delete,
-    ):
+        mock_open: mock.Mock,
+        mock_mkdtemp: mock.Mock,
+        mock_consume_file: mock.Mock,
+        mock_group: mock.Mock,
+        mock_chord: mock.Mock,
+        mock_delete: mock.Mock,
+    ) -> None:
         doc = self.doc2
         temp_dir = self.dirs.scratch_dir / "remove-password-delete"
         temp_dir.mkdir(parents=True, exist_ok=True)
@@ -1367,8 +1363,8 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         fake_pdf = mock.MagicMock()
         fake_pdf.pages = [mock.Mock(), mock.Mock()]
 
-        def save_side_effect(target_path):
-            Path(target_path).write_bytes(b"password removed")
+        def save_side_effect(target_path: Path) -> None:
+            target_path.write_bytes(b"password removed")
 
         fake_pdf.save.side_effect = save_side_effect
         mock_open.return_value.__enter__.return_value = fake_pdf
@@ -1391,7 +1387,7 @@ class TestPDFActions(DirectoriesMixin, TestCase):
         mock_delete.si.assert_called_once_with([doc.id])
 
     @mock.patch("pikepdf.open")
-    def test_remove_password_open_failure(self, mock_open):
+    def test_remove_password_open_failure(self, mock_open: mock.Mock) -> None:
         mock_open.side_effect = RuntimeError("wrong password")
 
         with self.assertLogs("paperless.bulk_edit", level="ERROR") as cm:

src/documents/tests/test_document_model.py

@@ -78,6 +78,28 @@ class TestDocument(TestCase):
             empty_trash([document.pk])
             self.assertEqual(mock_unlink.call_count, 2)
 
+    def test_delete_root_deletes_versions(self) -> None:
+        root = Document.objects.create(
+            correspondent=Correspondent.objects.create(name="Test0"),
+            title="Head",
+            content="content",
+            checksum="checksum",
+            mime_type="application/pdf",
+        )
+        Document.objects.create(
+            root_document=root,
+            correspondent=root.correspondent,
+            title="Version",
+            content="content",
+            checksum="checksum2",
+            mime_type="application/pdf",
+        )
+
+        root.delete()
+
+        self.assertEqual(Document.objects.count(), 0)
+        self.assertEqual(Document.deleted_objects.count(), 2)
+
     def test_file_name(self) -> None:
         doc = Document(
             mime_type="application/pdf",

src/documents/views.py

@@ -10,6 +10,7 @@ from collections import deque
 from datetime import datetime
 from pathlib import Path
 from time import mktime
+from typing import Any
 from typing import Literal
 from unicodedata import normalize
 from urllib.parse import quote
@@ -37,8 +38,10 @@ from django.db.models import Sum
 from django.db.models import When
 from django.db.models.functions import Lower
 from django.db.models.manager import Manager
+from django.db.models.query import QuerySet
 from django.http import FileResponse
 from django.http import Http404
+from django.http import HttpRequest
 from django.http import HttpResponse
 from django.http import HttpResponseBadRequest
 from django.http import HttpResponseForbidden
@@ -83,6 +86,7 @@ from rest_framework.mixins import ListModelMixin
 from rest_framework.mixins import RetrieveModelMixin
 from rest_framework.mixins import UpdateModelMixin
 from rest_framework.permissions import IsAuthenticated
+from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.viewsets import GenericViewSet
 from rest_framework.viewsets import ModelViewSet
@@ -168,6 +172,7 @@ from documents.serialisers import CustomFieldSerializer
 from documents.serialisers import DocumentListSerializer
 from documents.serialisers import DocumentSerializer
 from documents.serialisers import DocumentTypeSerializer
+from documents.serialisers import DocumentVersionSerializer
 from documents.serialisers import EmailSerializer
 from documents.serialisers import NotesSerializer
 from documents.serialisers import PostDocumentSerializer
@@ -747,7 +752,7 @@ class DocumentViewSet(
     GenericViewSet,
 ):
     model = Document
-    queryset = Document.objects.annotate(num_notes=Count("notes"))
+    queryset = Document.objects.all()
     serializer_class = DocumentSerializer
     pagination_class = StandardPagination
     permission_classes = (IsAuthenticated, PaperlessObjectPermissions)
@@ -777,7 +782,8 @@ class DocumentViewSet(
 
     def get_queryset(self):
         return (
-            Document.objects.distinct()
+            Document.objects.filter(root_document__isnull=True)
+            .distinct()
             .order_by("-created")
             .annotate(num_notes=Count("notes"))
             .select_related("correspondent", "storage_path", "document_type", "owner")
@@ -803,6 +809,37 @@ class DocumentViewSet(
         )
         return super().get_serializer(*args, **kwargs)
 
+    @extend_schema(
+        operation_id="documents_root",
+        responses=inline_serializer(
+            name="DocumentRootResponse",
+            fields={
+                "root_id": serializers.IntegerField(),
+            },
+        ),
+    )
+    @action(methods=["get"], detail=True, url_path="root")
+    def root(self, request, pk=None):
+        try:
+            doc = Document.global_objects.select_related(
+                "owner",
+                "root_document",
+            ).get(pk=pk)
+        except Document.DoesNotExist:
+            raise Http404
+
+        root_doc = doc if doc.root_document_id is None else doc.root_document
+        if root_doc is None:
+            raise Http404
+        if request.user is not None and not has_perms_owner_aware(
+            request.user,
+            "view_document",
+            root_doc,
+        ):
+            return HttpResponseForbidden("Insufficient permissions")
+
+        return Response({"root_id": root_doc.id})
+
     def update(self, request, *args, **kwargs):
         response = super().update(request, *args, **kwargs)
         from documents import index
@@ -839,18 +876,58 @@ class DocumentViewSet(
             and request.query_params["original"] == "true"
         )
 
+    def _resolve_file_doc(self, root_doc: Document, request):
+        version_param = request.query_params.get("version")
+        if version_param:
+            try:
+                version_id = int(version_param)
+            except (TypeError, ValueError):
+                raise NotFound("Invalid version parameter")
+            try:
+                candidate = Document.global_objects.select_related("owner").get(
+                    id=version_id,
+                )
+            except Document.DoesNotExist:
+                raise Http404
+            if (
+                candidate.id != root_doc.id
+                and candidate.root_document_id != root_doc.id
+            ):
+                raise Http404
+            return candidate
+        latest = Document.objects.filter(root_document=root_doc).order_by("id").last()
+        return latest or root_doc
+
     def file_response(self, pk, request, disposition):
-        doc = Document.global_objects.select_related("owner").get(id=pk)
+        request_doc = Document.global_objects.select_related("owner").get(id=pk)
+        root_doc = (
+            request_doc
+            if request_doc.root_document_id is None
+            else Document.global_objects.select_related("owner").get(
+                id=request_doc.root_document_id,
+            )
+        )
         if request.user is not None and not has_perms_owner_aware(
             request.user,
             "view_document",
-            doc,
+            root_doc,
         ):
             return HttpResponseForbidden("Insufficient permissions")
+        # If a version is explicitly requested, use it. Otherwise:
+        # - if pk is a root document: serve newest version
+        # - if pk is a version: serve that version
+        if "version" in request.query_params:
+            file_doc = self._resolve_file_doc(root_doc, request)
+        else:
+            file_doc = (
+                self._resolve_file_doc(root_doc, request)
+                if request_doc.root_document_id is None
+                else request_doc
+            )
         return serve_file(
-            doc=doc,
+            doc=file_doc,
             use_archive=not self.original_requested(request)
-            and doc.has_archive_version,
+            and file_doc.has_archive_version,
             disposition=disposition,
         )
 
@@ -885,16 +962,33 @@ class DocumentViewSet(
     )
     def metadata(self, request, pk=None):
         try:
-            doc = Document.objects.select_related("owner").get(pk=pk)
+            request_doc = Document.objects.select_related("owner").get(pk=pk)
+            root_doc = (
+                request_doc
+                if request_doc.root_document_id is None
+                else Document.objects.select_related("owner").get(
+                    id=request_doc.root_document_id,
+                )
+            )
             if request.user is not None and not has_perms_owner_aware(
                 request.user,
                 "view_document",
-                doc,
+                root_doc,
             ):
                 return HttpResponseForbidden("Insufficient permissions")
         except Document.DoesNotExist:
             raise Http404
 
+        # Choose the effective document (newest version by default, or explicit via ?version=)
+        if "version" in request.query_params:
+            doc = self._resolve_file_doc(root_doc, request)
+        else:
+            doc = (
+                self._resolve_file_doc(root_doc, request)
+                if request_doc.root_document_id is None
+                else request_doc
+            )
+
         document_cached_metadata = get_metadata_cache(doc.pk)
 
         archive_metadata = None
@@ -1063,8 +1157,36 @@ class DocumentViewSet(
     )
     def preview(self, request, pk=None):
         try:
-            response = self.file_response(pk, request, "inline")
-            return response
+            request_doc = Document.objects.select_related("owner").get(id=pk)
+            root_doc = (
+                request_doc
+                if request_doc.root_document_id is None
+                else Document.objects.select_related("owner").get(
+                    id=request_doc.root_document_id,
+                )
+            )
+            if request.user is not None and not has_perms_owner_aware(
+                request.user,
+                "view_document",
+                root_doc,
+            ):
+                return HttpResponseForbidden("Insufficient permissions")
+
+            if "version" in request.query_params:
+                file_doc = self._resolve_file_doc(root_doc, request)
+            else:
+                file_doc = (
+                    self._resolve_file_doc(root_doc, request)
+                    if request_doc.root_document_id is None
+                    else request_doc
+                )
+
+            return serve_file(
+                doc=file_doc,
+                use_archive=not self.original_requested(request)
+                and file_doc.has_archive_version,
+                disposition="inline",
+            )
         except (FileNotFoundError, Document.DoesNotExist):
             raise Http404
 
@@ -1073,15 +1195,29 @@ class DocumentViewSet(
     @method_decorator(last_modified(thumbnail_last_modified))
     def thumb(self, request, pk=None):
         try:
-            doc = Document.objects.select_related("owner").get(id=pk)
+            request_doc = Document.objects.select_related("owner").get(id=pk)
+            root_doc = (
+                request_doc
+                if request_doc.root_document_id is None
+                else Document.objects.select_related("owner").get(
+                    id=request_doc.root_document_id,
+                )
+            )
             if request.user is not None and not has_perms_owner_aware(
                 request.user,
                 "view_document",
-                doc,
+                root_doc,
             ):
                 return HttpResponseForbidden("Insufficient permissions")
-
-            handle = doc.thumbnail_file
+            if "version" in request.query_params:
+                file_doc = self._resolve_file_doc(root_doc, request)
+            else:
+                file_doc = (
+                    self._resolve_file_doc(root_doc, request)
+                    if request_doc.root_document_id is None
+                    else request_doc
+                )
+            handle = file_doc.thumbnail_file
 
             return HttpResponse(handle, content_type="image/webp")
         except (FileNotFoundError, Document.DoesNotExist):
@@ -1373,6 +1509,159 @@ class DocumentViewSet(
                 "Error emailing documents, check logs for more detail.",
             )
 
+    @extend_schema(
+        operation_id="documents_update_version",
+        request=DocumentVersionSerializer,
+        responses={
+            200: OpenApiTypes.STR,
+        },
+    )
+    @action(methods=["post"], detail=True, parser_classes=[parsers.MultiPartParser])
+    def update_version(self, request, pk=None):
+        serializer = DocumentVersionSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+
+        try:
+            doc = Document.objects.select_related("owner").get(pk=pk)
+            if request.user is not None and not has_perms_owner_aware(
+                request.user,
+                "change_document",
+                doc,
+            ):
+                return HttpResponseForbidden("Insufficient permissions")
+        except Document.DoesNotExist:
+            raise Http404
+
+        try:
+            doc_name, doc_data = serializer.validated_data.get("document")
+            version_label = serializer.validated_data.get("version_label")
+
+            t = int(mktime(datetime.now().timetuple()))
+
+            settings.SCRATCH_DIR.mkdir(parents=True, exist_ok=True)
+
+            temp_file_path = Path(tempfile.mkdtemp(dir=settings.SCRATCH_DIR)) / Path(
+                pathvalidate.sanitize_filename(doc_name),
+            )
+
+            temp_file_path.write_bytes(doc_data)
+
+            os.utime(temp_file_path, times=(t, t))
+
+            input_doc = ConsumableDocument(
+                source=DocumentSource.ApiUpload,
+                original_file=temp_file_path,
+                root_document_id=doc.pk,
+            )
+
+            overrides = DocumentMetadataOverrides()
+            if version_label:
+                overrides.version_label = version_label.strip()
+            if request.user is not None:
+                overrides.actor_id = request.user.id
+
+            async_task = consume_file.delay(
+                input_doc,
+                overrides,
+            )
+            logger.debug(
+                f"Updated document {doc.id} with new version",
+            )
+            return Response(async_task.id)
+        except Exception as e:
+            logger.warning(f"An error occurred updating document: {e!s}")
+            return HttpResponseServerError(
+                "Error updating document, check logs for more detail.",
+            )
+
+    @extend_schema(
+        operation_id="documents_delete_version",
+        parameters=[
+            OpenApiParameter(
+                name="version_id",
+                type=OpenApiTypes.INT,
+                location=OpenApiParameter.PATH,
+            ),
+        ],
+        responses=inline_serializer(
+            name="DeleteDocumentVersionResult",
+            fields={
+                "result": serializers.CharField(),
+                "current_version_id": serializers.IntegerField(),
+            },
+        ),
+    )
+    @action(
+        methods=["delete"],
+        detail=True,
+        url_path=r"versions/(?P<version_id>\d+)",
+    )
+    def delete_version(self, request, pk=None, version_id=None):
+        try:
+            root_doc = Document.objects.select_related("owner").get(pk=pk)
+            if root_doc.root_document_id is not None:
+                root_doc = Document.objects.select_related("owner").get(
+                    pk=root_doc.root_document_id,
+                )
+        except Document.DoesNotExist:
+            raise Http404
+
+        if request.user is not None and not has_perms_owner_aware(
+            request.user,
+            "delete_document",
+            root_doc,
+        ):
+            return HttpResponseForbidden("Insufficient permissions")
+
+        try:
+            version_doc = Document.objects.select_related("owner").get(
+                pk=version_id,
+            )
+        except Document.DoesNotExist:
+            raise Http404
+
+        if version_doc.id == root_doc.id:
+            return HttpResponseBadRequest(
+                "Cannot delete the root/original version. Delete the document instead.",
+            )
+
+        if version_doc.root_document_id != root_doc.id:
+            raise Http404
+
+        from documents import index
+
+        index.remove_document_from_index(version_doc)
+        version_doc_id = version_doc.id
+        version_doc.delete()
+        if settings.AUDIT_LOG_ENABLED:
+            actor = (
+                request.user if request.user and request.user.is_authenticated else None
+            )
+            LogEntry.objects.log_create(
+                instance=root_doc,
+                changes={
+                    "Version Deleted": ["None", version_doc_id],
+                },
+                action=LogEntry.Action.UPDATE,
+                actor=actor,
+                additional_data={
+                    "reason": "Version deleted",
+                    "version_id": version_doc_id,
+                },
+            )
+
+        current = (
+            Document.objects.filter(Q(id=root_doc.id) | Q(root_document=root_doc))
+            .order_by("-id")
+            .first()
+        )
+        return Response(
+            {
+                "result": "OK",
+                "current_version_id": current.id if current else root_doc.id,
+            },
+        )
+
 
 class ChatStreamingSerializer(serializers.Serializer):
     q = serializers.CharField(required=True)
@@ -1639,7 +1928,7 @@ class SavedViewViewSet(ModelViewSet, PassUserMixin):
             .prefetch_related("filter_rules")
         )
 
-    def perform_create(self, serializer) -> None:
+    def perform_create(self, serializer: serializers.BaseSerializer[Any]) -> None:
         serializer.save(owner=self.request.user)
 
 
@@ -1672,13 +1961,13 @@ class BulkEditView(PassUserMixin):
         "modify_custom_fields": "custom_fields",
         "set_permissions": None,
         "delete": "deleted_at",
-        "rotate": "checksum",
-        "delete_pages": "checksum",
+        "rotate": None,
+        "delete_pages": None,
         "split": None,
         "merge": None,
-        "edit_pdf": "checksum",
+        "edit_pdf": None,
         "reprocess": "checksum",
-        "remove_password": "checksum",
+        "remove_password": None,
     }
 
     permission_classes = (IsAuthenticated,)
@@ -1696,6 +1985,8 @@ class BulkEditView(PassUserMixin):
         if method in [
             bulk_edit.split,
             bulk_edit.merge,
+            bulk_edit.rotate,
+            bulk_edit.delete_pages,
             bulk_edit.edit_pdf,
             bulk_edit.remove_password,
         ]:
@@ -3181,7 +3472,7 @@ class CustomFieldViewSet(ModelViewSet):
 
     queryset = CustomField.objects.all().order_by("-created")
 
-    def get_queryset(self):
+    def get_queryset(self) -> QuerySet[CustomField]:
         filter = (
             Q(fields__document__deleted_at__isnull=True)
             if self.request.user is None or self.request.user.is_superuser
@@ -3494,11 +3785,16 @@ class TrashView(ListModelMixin, PassUserMixin):
 
     queryset = Document.deleted_objects.all()
 
-    def get(self, request, format=None):
+    def get(self, request: Request, format: str | None = None) -> Response:
         self.serializer_class = DocumentSerializer
         return self.list(request, format)
 
-    def post(self, request, *args, **kwargs):
+    def post(
+        self,
+        request: Request,
+        *args: Any,
+        **kwargs: Any,
+    ) -> Response | HttpResponse:
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
 
@@ -3522,7 +3818,7 @@ class TrashView(ListModelMixin, PassUserMixin):
         return Response({"result": "OK", "doc_ids": doc_ids})
 
 
-def serve_logo(request, filename=None):
+def serve_logo(request: HttpRequest, filename: str | None = None) -> FileResponse:
     """
     Serves the configured logo file with Content-Disposition: attachment.
     Prevents inline execution of SVGs. See GHSA-6p53-hqqw-8j62

src/paperless/checks.py

@@ -167,6 +167,17 @@ def settings_values_check(app_configs, **kwargs):
             )
         return msgs
 
+    def _barcode_scanner_validate():
+        """
+        Validates the barcode scanner type
+        """
+        msgs = []
+        if settings.CONSUMER_BARCODE_SCANNER not in ["PYZBAR", "ZXING"]:
+            msgs.append(
+                Error(f'Invalid Barcode Scanner "{settings.CONSUMER_BARCODE_SCANNER}"'),
+            )
+        return msgs
+
     def _email_certificate_validate():
         msgs = []
         # Existence checks
@@ -184,6 +195,7 @@ def settings_values_check(app_configs, **kwargs):
     return (
         _ocrmypdf_settings_check()
         + _timezone_validate()
+        + _barcode_scanner_validate()
         + _email_certificate_validate()
     )
 

src/paperless/settings.py

@@ -1106,6 +1106,11 @@ CONSUMER_BARCODE_STRING: Final[str] = os.getenv(
     "PATCHT",
 )
 
+CONSUMER_BARCODE_SCANNER: Final[str] = os.getenv(
+    "PAPERLESS_CONSUMER_BARCODE_SCANNER",
+    "PYZBAR",
+).upper()
+
 CONSUMER_ENABLE_ASN_BARCODE: Final[bool] = __get_boolean(
     "PAPERLESS_CONSUMER_ENABLE_ASN_BARCODE",
 )

src/paperless/tests/test_checks.py

@@ -187,6 +187,31 @@ class TestTimezoneSettingsChecks(DirectoriesMixin, TestCase):
         self.assertIn('Timezone "TheMoon\\MyCrater"', msg.msg)
 
 
+class TestBarcodeSettingsChecks(DirectoriesMixin, TestCase):
+    @override_settings(CONSUMER_BARCODE_SCANNER="Invalid")
+    def test_barcode_scanner_invalid(self) -> None:
+        msgs = settings_values_check(None)
+        self.assertEqual(len(msgs), 1)
+
+        msg = msgs[0]
+
+        self.assertIn('Invalid Barcode Scanner "Invalid"', msg.msg)
+
+    @override_settings(CONSUMER_BARCODE_SCANNER="")
+    def test_barcode_scanner_empty(self) -> None:
+        msgs = settings_values_check(None)
+        self.assertEqual(len(msgs), 1)
+
+        msg = msgs[0]
+
+        self.assertIn('Invalid Barcode Scanner ""', msg.msg)
+
+    @override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
+    def test_barcode_scanner_valid(self) -> None:
+        msgs = settings_values_check(None)
+        self.assertEqual(len(msgs), 0)
+
+
 class TestEmailCertSettingsChecks(DirectoriesMixin, FileSystemAssertsMixin, TestCase):
     @override_settings(EMAIL_CERTIFICATE_FILE=Path("/tmp/not_actually_here.pem"))
     def test_not_valid_file(self) -> None:

uv.lock

@@ -3073,6 +3073,7 @@ dependencies = [
     { name = "python-gnupg", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "python-ipware", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "python-magic", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
+    { name = "pyzbar", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "rapidfuzz", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "redis", extra = ["hiredis"], marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "regex", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
@@ -3086,7 +3087,9 @@ dependencies = [
     { name = "watchfiles", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "whitenoise", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "whoosh-reloaded", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
-    { name = "zxing-cpp", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
+    { name = "zxing-cpp", version = "2.3.0", source = { registry = "https://pypi.org/simple" }, marker = "(python_full_version != '3.12.*' and platform_machine == 'aarch64' and sys_platform == 'linux') or (python_full_version != '3.12.*' and platform_machine == 'x86_64' and sys_platform == 'linux') or (platform_machine != 'aarch64' and platform_machine != 'x86_64' and sys_platform == 'linux') or sys_platform == 'darwin'" },
+    { name = "zxing-cpp", version = "2.3.0", source = { url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_aarch64.whl" }, marker = "python_full_version == '3.12.*' and platform_machine == 'aarch64' and sys_platform == 'linux'" },
+    { name = "zxing-cpp", version = "2.3.0", source = { url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_x86_64.whl" }, marker = "python_full_version == '3.12.*' and platform_machine == 'x86_64' and sys_platform == 'linux'" },
 ]
 
 [package.optional-dependencies]
@@ -3225,6 +3228,7 @@ requires-dist = [
     { name = "python-gnupg", specifier = "~=0.5.4" },
     { name = "python-ipware", specifier = "~=3.0.0" },
     { name = "python-magic", specifier = "~=0.4.27" },
+    { name = "pyzbar", specifier = "~=0.1.9" },
     { name = "rapidfuzz", specifier = "~=3.14.0" },
     { name = "redis", extras = ["hiredis"], specifier = "~=5.2.1" },
     { name = "regex", specifier = ">=2025.9.18" },
@@ -3237,7 +3241,9 @@ requires-dist = [
     { name = "watchfiles", specifier = ">=1.1.1" },
     { name = "whitenoise", specifier = "~=6.11" },
     { name = "whoosh-reloaded", specifier = ">=2.7.5" },
-    { name = "zxing-cpp", specifier = "~=3.0.0" },
+    { name = "zxing-cpp", marker = "(python_full_version != '3.12.*' and platform_machine == 'aarch64') or (python_full_version != '3.12.*' and platform_machine == 'x86_64') or (platform_machine != 'aarch64' and platform_machine != 'x86_64') or sys_platform != 'linux'", specifier = "~=2.3.0" },
+    { name = "zxing-cpp", marker = "python_full_version == '3.12.*' and platform_machine == 'aarch64' and sys_platform == 'linux'", url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_aarch64.whl" },
+    { name = "zxing-cpp", marker = "python_full_version == '3.12.*' and platform_machine == 'x86_64' and sys_platform == 'linux'", url = "https://github.com/paperless-ngx/builder/releases/download/zxing-2.3.0/zxing_cpp-2.3.0-cp312-cp312-linux_x86_64.whl" },
 ]
 provides-extras = ["mariadb", "postgres", "webserver"]
 
@@ -4277,6 +4283,14 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/da/92/1446574745d74df0c92e6aa4a7b0b3130706a4142b2d1a5869f2eaa423c6/pyyaml-6.0.3-cp314-cp314t-musllinux_1_2_x86_64.whl", hash = "sha256:16249ee61e95f858e83976573de0f5b2893b3677ba71c9dd36b9cf8be9ac6d65", size = 829923, upload-time = "2025-09-25T21:32:54.537Z" },
 ]
 
+[[package]]
+name = "pyzbar"
+version = "0.1.9"
+source = { registry = "https://pypi.org/simple" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/6d/24/81ebe6a1c00760471a3028a23cbe0b94e5fa2926e5ba47adc895920887bc/pyzbar-0.1.9-py2.py3-none-any.whl", hash = "sha256:4559628b8192feb25766d954b36a3753baaf5c97c03135aec7e4a026036b475d", size = 32560, upload-time = "2022-03-15T14:53:40.637Z" },
+]
+
 [[package]]
 name = "qrcode"
 version = "8.2"
@@ -5223,10 +5237,6 @@ wheels = [
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-1-cp311-none-macosx_11_0_arm64.whl", hash = "sha256:0826ac8e409551e12b2360ac18b4161a838cbd111933e694752f351191331d09" },
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-1-cp312-none-macosx_11_0_arm64.whl", hash = "sha256:7fbbf409143a4fe0812a40c0b46a436030a7e1d14fe8c5234dfbe44df47f617e" },
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-1-cp313-none-macosx_11_0_arm64.whl", hash = "sha256:b39cafff7229699f9d6e172cac74d85fd71b568268e439e08d9c540e54732a3e" },
-    { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-2-cp310-none-macosx_11_0_arm64.whl", hash = "sha256:7417ef370d7c3969dd509dae8d5c7daeb945af335ab76dd38358ba30a91251c1" },
-    { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-2-cp311-none-macosx_11_0_arm64.whl", hash = "sha256:90821a3194b8806d9fa9fdaa9308c1bc73df0c26808274b14129a97c99f35794" },
-    { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-2-cp312-none-macosx_11_0_arm64.whl", hash = "sha256:358bd7125cbec6e692d60618a5eec7f55a51b29e3652a849fd42af021d818023" },
-    { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-2-cp313-none-macosx_11_0_arm64.whl", hash = "sha256:470de4176007c2700735e003a830828a88d27129032a3add07291da07e2a94e8" },
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-cp310-none-macosx_11_0_arm64.whl", hash = "sha256:2d16abfce6c92584ceeb00c3b2665d5798424dd9ed235ea69b72e045cd53ae97" },
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-cp311-none-macosx_11_0_arm64.whl", hash = "sha256:4584ab167995c0479f6821e3dceaf199c8166c811d3adbba5d8eedbbfa6764fd" },
     { url = "https://download.pytorch.org/whl/cpu/torch-2.10.0-cp312-none-macosx_11_0_arm64.whl", hash = "sha256:45a1c5057629444aeb1c452c18298fa7f30f2f7aeadd4dc41f9d340980294407" },
@@ -6231,28 +6241,50 @@ wheels = [
 
 [[package]]
 name = "zxing-cpp"
-version = "3.0.0"
+version = "2.3.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/f1/c6/ac2a12cdc2b1c296804fc6a65bf112b607825ca7f47742a5aca541134711/zxing_cpp-3.0.0.tar.gz", hash = "sha256:703353304de24d947bd68044fac4e062953a7b64029de6941ba8ffeb4476b60d", size = 1197544, upload-time = "2026-02-10T12:50:11.252Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/ac/84/689a748f08635ff1543265905532cbe6dfaa299350cfd6591e4456da3014/zxing_cpp-3.0.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:63bcc80e7a6c741f1948381bb1b9c36082400624a217e3306aebb1e2bec21f6f", size = 910995, upload-time = "2026-02-10T12:49:22.189Z" },
-    { url = "https://files.pythonhosted.org/packages/28/3d/f3c23181697a2407e2079dc122ba8c266b46842e3ffc810d510716a95759/zxing_cpp-3.0.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:0b30e2f4b081a85fe5f09ba34cb17486d607625f2ddeb0c80d5212d2872e5530", size = 865029, upload-time = "2026-02-10T12:49:24.719Z" },
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