# Usage Overview
Paperless is an application that manages your personal documents. With
the help of a document scanner (see [the scanners wiki](https://github.com/paperless-ngx/paperless-ngx/wiki/Scanner-&-Software-Recommendations)),
paperless transforms your unwieldy physical document binders into a searchable archive
and provides many utilities for finding and managing your documents.
## Terms and definitions
Paperless essentially consists of two different parts for managing your
documents:
- The _consumer_ watches a specified folder and adds all documents in
that folder to paperless.
- The _web server_ provides a UI that you use to manage and search for
your scanned documents.
Each document has a couple of fields that you can assign to them:
- A _Document_ is a piece of paper that sometimes contains valuable
information.
- The _correspondent_ of a document is the person, institution or
company that a document either originates from, or is sent to.
- A _tag_ is a label that you can assign to documents. Think of labels
as more powerful folders: Multiple documents can be grouped together
with a single tag, however, a single document can also have multiple
tags. This is not possible with folders. The reason folders are not
implemented in paperless is simply that tags are much more versatile
than folders.
- A _document type_ is used to demarcate the type of a document such
as letter, bank statement, invoice, contract, etc. It is used to
identify what a document is about.
- The _date added_ of a document is the date the document was scanned
into paperless. You cannot and should not change this date.
- The _date created_ of a document is the date the document was
initially issued. This can be the date you bought a product, the
date you signed a contract, or the date a letter was sent to you.
- The _archive serial number_ (short: ASN) of a document is the
identifier of the document in your physical document binders. See
[recommended workflow](#usage-recommended-workflow) below.
- The _content_ of a document is the text that was OCR'ed from the
document. This text is fed into the search engine and is used for
matching tags, correspondents and document types.
## Adding documents to paperless
Once you've got Paperless setup, you need to start feeding documents
into it. When adding documents to paperless, it will perform the
following operations on your documents:
1. OCR the document, if it has no text. Digital documents usually have
text, and this step will be skipped for those documents.
2. Paperless will create an archivable PDF/A document from your
document. If this document is coming from your scanner, it will have
embedded selectable text.
3. Paperless performs automatic matching of tags, correspondents and
types on the document before storing it in the database.
!!! tip
This process can be configured to fit your needs. If you don't want
paperless to create archived versions for digital documents, you can
configure that by configuring
`PAPERLESS_OCR_SKIP_ARCHIVE_FILE=with_text`. Please read the
[relevant section in the documentation](configuration.md#ocr).
!!! note
No matter which options you choose, Paperless will always store the
original document that it found in the consumption directory or in the
mail and will never overwrite that document. Archived versions are
stored alongside the original versions. Any files found in the
consumption directory will stored inside the Paperless-ngx file
structure and will not be retained in the consumption directory.
### The consumption directory
The primary method of getting documents into your database is by putting
them in the consumption directory. The consumer waits patiently, looking
for new additions to this directory. When it finds them,
the consumer goes about the process of parsing them with the OCR,
indexing what it finds, and storing it in the media directory. You should
think of this folder as a temporary location, as files will be re-created
inside Paperless-ngx and removed from the consumption folder.
Getting stuff into this directory is up to you. If you're running
Paperless on your local computer, you might just want to drag and drop
files there, but if you're running this on a server and want your
scanner to automatically push files to this directory, you'll need to
setup some sort of service to accept the files from the scanner.
Typically, you're looking at an FTP server like
[Proftpd](http://www.proftpd.org/) or a Windows folder share with
[Samba](https://www.samba.org/).
!!! warning
Files found in the consumption directory that are consumed will be
removed from the consumption directory and stored inside the
Paperless-ngx file structure using any settings / storage paths
you have specified. This action is performed as safely as possible
but this means it is expected that files in the consumption
directory will no longer exist (there) after being consumed.
### Web UI Upload
The dashboard has a button to upload documents to paperless or you
can simply drag a file anywhere into the app to initiate the consumption
process.
### Mobile upload {#usage-mobile_upload}
Please see [the wiki](https://github.com/paperless-ngx/paperless-ngx/wiki/Related-Projects) for a user-maintained list of related projects and
software (e.g. for mobile devices) that is compatible with Paperless-ngx.
### IMAP (Email) {#usage-email}
You can tell paperless-ngx to consume documents from your email
accounts. This is a very flexible and powerful feature, if you regularly
received documents via mail that you need to archive. The mail consumer
can be configured via the frontend settings (/settings/mail) in the following
manner:
1. Define e-mail accounts.
2. Define mail rules for your account.
These rules perform the following:
1. Connect to the mail server.
2. Fetch all matching mails (as defined by folder, maximum age and the
filters)
3. Check if there are any consumable attachments.
4. If so, instruct paperless to consume the attachments and optionally
use the metadata provided in the rule for the new document.
5. If documents were consumed from a mail, the rule action is performed
on that mail.
Paperless will check all emails only once and completely ignore messages
that do not match your filters. It will also only perform the rule action
on e-mails that it has consumed documents from.
The actions all ensure that the same mail is not consumed twice by
different means. These are as follows:
- **Delete:** Immediately deletes mail that paperless has consumed
documents from. Use with caution.
- **Mark as read:** Mark consumed mail as read. Paperless will not
consume documents from already read mails. If you read a mail before
paperless sees it, it will be ignored.
- **Flag:** Sets the 'important' flag on mails with consumed
documents. Paperless will not consume flagged mails.
- **Move to folder:** Moves consumed mails out of the way so that
paperless won't consume them again.
- **Add custom Tag:** Adds a custom tag to mails with consumed
documents (the IMAP standard calls these "keywords"). Paperless
will not consume mails already tagged. Not all mail servers support
this feature!
- **Apple Mail support:** Apple Mail clients allow differently colored tags. For this to work use `apple:<color>` (e.g. _apple:green_) as a custom tag. Available colors are _red_, _orange_, _yellow_, _blue_, _green_, _violet_ and _grey_.
!!! warning
The mail consumer will perform these actions on all mails it has
consumed documents from. Keep in mind that the actual consumption
process may fail for some reason, leaving you with missing documents in
paperless.
!!! note
With the correct set of rules, you can completely automate your email
documents. Create rules for every correspondent you receive digital
documents from and paperless will read them automatically. The default
action "mark as read" is pretty tame and will not cause any damage or
data loss whatsoever.
You can also setup a special folder in your mail account for paperless
and use your favorite mail client to move to be consumed mails into that
folder automatically or manually and tell paperless to move them to yet
another folder after consumption. It's up to you.
!!! note
When defining a mail rule with a folder, you may need to try different
characters to define how the sub-folders are separated. Common values
include ".", "/" or "\|", but this varies by the mail server.
Check the documentation for your mail server. In the event of an error
fetching mail from a certain folder, check the Paperless logs. When a
folder is not located, Paperless will attempt to list all folders found
in the account to the Paperless logs.
!!! note
Paperless will process the rules in the order defined in the admin page.
You can define catch-all rules and have them executed last to consume
any documents not matched by previous rules. Such a rule may assign an
"Unknown mail document" tag to consumed documents so you can inspect
them further.
Paperless is set up to check your mails every 10 minutes. This can be
configured via [`PAPERLESS_EMAIL_TASK_CRON`](configuration.md#PAPERLESS_EMAIL_TASK_CRON)
### REST API
You can also submit a document using the REST API, see [POSTing documents](api.md#file-uploads)
for details.
## Permissions
Permissions in Paperless-ngx are based around ['global' permissions](#global-permissions) as well as
['object-level' permissions](#object-permissions). Global permissions determine which parts of the
application a user can access (e.g. Documents, Tags, Settings) and object-level determine which
objects are visible or editable. All objects have an 'owner' and 'view' and 'edit' permissions which
can be granted to other users or groups. The paperless-ngx permissions system uses the built-in user
model of the backend framework, Django.
!!! tip
Object-level permissions only apply to the object itself. In other words, setting permissions
for a Tag will _not_ affect the permissions of documents that have the Tag.
Permissions can be set using the new "Permissions" tab when editing documents, or bulk-applied
in the UI by selecting documents and choosing the "Permissions" button.
### Default permissions
[Workflows](#workflows) provide advanced ways to control permissions.
For objects created via the web UI (tags, doc types, etc.) the default is to set the current user
as owner and no extra permissions, but you can explicitly set these under Settings > Permissions.
Documents consumed via the consumption directory do not have an owner or additional permissions set by default, but again, can be controlled with [Workflows](#workflows).
### Users and Groups
Paperless-ngx supports editing users and groups via the 'frontend' UI, which can be found under
Settings > Users & Groups, assuming the user has access. If a user is designated
as a member of a group those permissions will be inherited and this is reflected in the UI. Explicit
permissions can be granted to limit access to certain parts of the UI (and corresponding API endpoints).
!!! note
Superusers can access all parts of the front and backend application as well as any and all objects.
#### Admin Status
Admin status (Django 'staff status') grants access to viewing the paperless logs and the system status dialog
as well as accessing the Django backend.
#### Detailed Explanation of Global Permissions {#global-permissions}
Global permissions define what areas of the app and API endpoints the user can access. For example, they
determine if a user can create, edit, delete or view _any_ documents, but individual documents themselves
still have "object-level" permissions.
| Type | Details |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| AppConfig | _Change_ or higher permissions grants access to the "Application Configuration" area. |
| Correspondent | Grants global permissions to add, edit, delete or view Correspondents. |
| CustomField | Grants global permissions to add, edit, delete or view Custom Fields. |
| Document | Grants global permissions to add, edit, delete or view Documents. |
| DocumentType | Grants global permissions to add, edit, delete or view Document Types. |
| Group | Grants global permissions to add, edit, delete or view Groups. |
| MailAccount | Grants global permissions to add, edit, delete or view Mail Accounts. |
| MailRule | Grants global permissions to add, edit, delete or view Mail Rules. |
| Note | Grants global permissions to add, edit, delete or view Notes. |
| PaperlessTask | Grants global permissions to view or dismiss (_Change_) File Tasks. |
| SavedView | Grants global permissions to add, edit, delete or view Saved Views. |
| ShareLink | Grants global permissions to add, delete or view Share Links. |
| StoragePath | Grants global permissions to add, edit, delete or view Storage Paths. |
| Tag | Grants global permissions to add, edit, delete or view Tags. |
| UISettings | Grants global permissions to add, edit, delete or view the UI settings that are used by the web app.<br/>Users expected to access the web UI should usually be granted at least _View_ permissions. |
| User | Grants global permissions to add, edit, delete or view Users. |
| Workflow | Grants global permissions to add, edit, delete or view Workflows.<br/>Note that Workflows are global, in other words all users who can access workflows have access to the same set of them. |
#### Detailed Explanation of Object Permissions {#object-permissions}
| Type | Details |
| ----- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Owner | By default objects are only visible and editable by their owner.<br/>Only the object owner can grant permissions to other users or groups.<br/>Additionally, only document owners can create share links and add / remove custom fields.<br/>For backwards compatibility objects can have no owner which makes them visible to any user. |
| View | Confers the ability to view (not edit) a document, tag, etc.<br/>Users without 'view' (or higher) permissions will be shown _'Private'_ in place of the object name for example when viewing a document with a tag for which the user doesn't have permissions. |
| Edit | Confers the ability to edit (and view) a document, tag, etc. |
### Password reset
In order to enable the password reset feature you will need to setup an SMTP backend, see
[`PAPERLESS_EMAIL_HOST`](configuration.md#PAPERLESS_EMAIL_HOST). If your installation does not have
[`PAPERLESS_URL`](configuration.md#PAPERLESS_URL) set, the reset link included in emails will use the server host.
## Workflows
!!! note
v2.3 added "Workflows" and existing "Consumption Templates" were converted automatically to the new more powerful format.
Workflows allow hooking into the Paperless-ngx document pipeline, for example to alter what metadata (tags, doc types) and
permissions (owner, privileges) are assigned to documents. Workflows can have multiple 'triggers' and 'actions'. Triggers
are events (with optional filtering rules) that will cause the workflow to be run and actions are the set of sequential
actions to apply.
In general, workflows and any actions they contain are applied sequentially by sort order. For "assignment" actions, subsequent
workflow actions will override previous assignments, except for assignments that accept multiple items e.g. tags, custom
fields and permissions, which will be merged.
### Workflow Triggers
Currently, there are three events that correspond to workflow trigger 'types':
1. **Consumption Started**: _before_ a document is consumed, so events can include filters by source (mail, consumption
folder or API), file path, file name, mail rule
2. **Document Added**: _after_ a document is added. At this time, file path and source information is no longer available,
but the document content has been extracted and metadata such as document type, tags, etc. have been set, so these can now
be used for filtering.
3. **Document Updated**: when a document is updated. Similar to 'added' events, triggers can include filtering by content matching,
tags, doc type, or correspondent.
The following flow diagram illustrates the three trigger types:
```mermaid
flowchart TD
consumption{"Matching
'Consumption'
trigger(s)"}
added{"Matching
'Added'
trigger(s)"}
updated{"Matching
'Updated'
trigger(s)"}
A[New Document] --> consumption
consumption --> |Yes| C[Workflow Actions Run]
consumption --> |No| D
C --> D[Document Added]
D -- Paperless-ngx 'matching' of tags, etc. --> added
added --> |Yes| F[Workflow Actions Run]
added --> |No| G
F --> G[Document Finalized]
H[Existing Document Changed] --> updated
updated --> |Yes| J[Workflow Actions Run]
updated --> |No| K
J --> K[Document Saved]
```
#### Filters {#workflow-trigger-filters}
Workflows allow you to filter by:
- Source, e.g. documents uploaded via consume folder, API (& the web UI) and mail fetch
- File name, including wildcards e.g. \*.pdf will apply to all pdfs
- File path, including wildcards. Note that enabling `PAPERLESS_CONSUMER_RECURSIVE` would allow, for
example, automatically assigning documents to different owners based on the upload directory.
- Mail rule. Choosing this option will force 'mail fetch' to be the workflow source.
- Content matching (`Added` and `Updated` triggers only). Filter document content using the matching settings.
- Tags (`Added` and `Updated` triggers only). Filter for documents with any of the specified tags
- Document type (`Added` and `Updated` triggers only). Filter documents with this doc type
- Correspondent (`Added` and `Updated` triggers only). Filter documents with this correspondent
### Workflow Actions
There are currently two types of workflow actions, "Assignment", which can assign:
- Title, see [title placeholders](usage.md#title-placeholders) below
- Tags, correspondent, document type and storage path
- Document owner
- View and / or edit permissions to users or groups
- Custom fields. Note that no value for the field will be set
and "Removal" actions, which can remove either all of or specific sets of the following:
- Tags, correspondents, document types or storage paths
- Document owner
- View and / or edit permissions
- Custom fields
#### Title placeholders
Workflow titles can include placeholders but the available options differ depending on the type of
workflow trigger. This is because at the time of consumption (when the title is to be set), no automatic tags etc. have been
applied. You can use the following placeholders with any trigger type:
- `{correspondent}`: assigned correspondent name
- `{document_type}`: assigned document type name
- `{owner_username}`: assigned owner username
- `{added}`: added datetime
- `{added_year}`: added year
- `{added_year_short}`: added year
- `{added_month}`: added month
- `{added_month_name}`: added month name
- `{added_month_name_short}`: added month short name
- `{added_day}`: added day
- `{added_time}`: added time in HH:MM format
- `{original_filename}`: original file name without extension
The following placeholders are only available for "added" or "updated" triggers
- `{created}`: created datetime
- `{created_year}`: created year
- `{created_year_short}`: created year
- `{created_month}`: created month
- `{created_month_name}`: created month name
- `{created_month_name_short}`: created month short name
- `{created_day}`: created day
- `{created_time}`: created time in HH:MM format
### Workflow permissions
All users who have application permissions for editing workflows can see the same set
of workflows. In other words, workflows themselves intentionally do not have an owner or permissions.
Given their potentially far-reaching capabilities, you may want to restrict access to workflows.
Upon migration, existing installs will grant access to workflows to users who can add
documents (and superusers who can always access all parts of the app).
## Custom Fields {#custom-fields}
Paperless-ngx supports the use of custom fields for documents as of v2.0, allowing a user
to optionally attach data to documents which does not fit in the existing set of fields
Paperless-ngx provides.
1. First, create a custom field (under "Manage"), with a given name and data type. This could be something like "Invoice Number" or "Date Paid", with a data type of "Number", "Date", "String", etc.
2. Once created, a field can be used with documents and data stored. To do so, use the "Custom Fields" menu on the document detail page, choose your existing field and click "Add". Once the field is visible in the form you can enter the appropriate
data which will be validated according to the custom field "data type".
3. Fields can be removed by hovering over the field name revealing a "Remove" button.
!!! important
Added / removed fields, as well as any data is not saved to the document until you
actually hit the "Save" button, similar to other changes on the document details page.
!!! note
Once the data type for a field is set, it cannot be changed.
Multiple fields may be attached to a document but the same field name cannot be assigned multiple times to the a single document.
The following custom field types are supported:
- `Text`: any text
- `Boolean`: true / false (check / unchecked) field
- `Date`: date
- `URL`: a valid url
- `Integer`: integer number e.g. 12
- `Number`: float number e.g. 12.3456
- `Monetary`: [ISO 4217 currency code](https://en.wikipedia.org/wiki/ISO_4217#List_of_ISO_4217_currency_codes) and a number with exactly two decimals, e.g. USD12.30
- `Document Link`: reference(s) to other document(s) displayed as links, automatically creates a symmetrical link in reverse
## Share Links
Paperless-ngx added the ability to create shareable links to files in version 2.0. You can find the button for this on the document detail screen.
- Share links do not require a user to login and thus link directly to a file.
- Links are unique and are of the form `{paperless-url}/share/{randomly-generated-slug}`.
- Links can optionally have an expiration time set.
- After a link expires or is deleted users will be redirected to the regular paperless-ngx login.
!!! tip
If your paperless-ngx instance is behind a reverse-proxy you may want to create an exception to bypass any authentication layers that are part of your setup in order to make links truly publicly-accessible. Of course, do so with caution.
## PDF Actions
Paperless-ngx supports 3 basic editing operations for PDFs (these operations cannot be performed on non-PDF files):
- Merging documents: available when selecting multiple documents for 'bulk editing'
- Rotating documents: available when selecting multiple documents for 'bulk editing' and from an individual document's details page.
- Splitting documents: available from an individual document's details page
!!! important
Note that rotation alters the Paperless-ngx _original_ file, which would, for example, invalidate a digital signature.
## Document History
As of version 2.7, Paperless-ngx automatically records all changes to a document and records this in an audit log. The feature requires [`PAPERLESS_AUDIT_LOG_ENABLED`](configuration.md#PAPERLESS_AUDIT_LOG_ENABLED) be enabled, which it is by default as of version 2.7.
Changes to documents are visible under the "History" tab. Note that certain changes such as those made by workflows, record the 'actor'
as "System".
## Best practices {#basic-searching}
Paperless offers a couple tools that help you organize your document
collection. However, it is up to you to use them in a way that helps you
organize documents and find specific documents when you need them. This
section offers a couple ideas for managing your collection.
Document types allow you to classify documents according to what they
are. You can define types such as "Receipt", "Invoice", or
"Contract". If you used to collect all your receipts in a single
binder, you can recreate that system in paperless by defining a document
type, assigning documents to that type and then filtering by that type
to only see all receipts.
Not all documents need document types. Sometimes its hard to determine
what the type of a document is or it is hard to justify creating a
document type that you only need once or twice. This is okay. As long as
the types you define help you organize your collection in the way you
want, paperless is doing its job.
Tags can be used in many different ways. Think of tags are more
versatile folders or binders. If you have a binder for documents related
to university / your car or health care, you can create these binders in
paperless by creating tags and assigning them to relevant documents.
Just as with documents, you can filter the document list by tags and
only see documents of a certain topic.
With physical documents, you'll often need to decide which folder the
document belongs to. The advantage of tags over folders and binders is
that a single document can have multiple tags. A physical document
cannot magically appear in two different folders, but with tags, this is
entirely possible.
!!! tip
This can be used in many different ways. One example: Imagine you're
working on a particular task, such as signing up for university. Usually
you'll need to collect a bunch of different documents that are already
sorted into various folders. With the tag system of paperless, you can
create a new group of documents that are relevant to this task without
destroying the already existing organization. When you're done with the
task, you could delete the tag again, which would be equal to sorting
documents back into the folder they belong into. Or keep the tag, up to
you.
All of the logic above applies to correspondents as well. Attach them to
documents if you feel that they help you organize your collection.
When you've started organizing your documents, create a couple saved
views for document collections you regularly access. This is equal to
having labeled physical binders on your desk, except that these saved
views are dynamic and simply update themselves as you add documents to
the system.
Here are a couple examples of tags and types that you could use in your
collection.
- An `inbox` tag for newly added documents that you haven't manually
edited yet.
- A tag `car` for everything car related (repairs, registration,
insurance, etc)
- A tag `todo` for documents that you still need to do something with,
such as reply, or perform some task online.
- A tag `bank account x` for all bank statement related to that
account.
- A tag `mail` for anything that you added to paperless via its mail
processing capabilities.
- A tag `missing_metadata` when you still need to add some metadata to
a document, but can't or don't want to do this right now.
## Searching {#basic-usage_searching}
### Global search
The top search bar in the web UI performs a "global" search of the various
objects Paperless-ngx uses, including documents, tags, workflows, etc. Only
objects for which the user has appropriate permissions are returned. For
documents, if there are < 3 results, "advanced" search results (which use
the document index) will also be included. This can be disabled under settings.
### Document searches
Paperless offers an extensive searching mechanism that is designed to
allow you to quickly find a document you're looking for (for example,
that thing that just broke and you bought a couple months ago, that
contract you signed 8 years ago).
When you search paperless for a document, it tries to match this query
against your documents. Paperless will look for matching documents by
inspecting their content, title, correspondent, type and tags. Paperless
returns a scored list of results, so that documents matching your query
better will appear further up in the search results.
By default, paperless returns only documents which contain all words
typed in the search bar. However, paperless also offers advanced search
syntax if you want to drill down the results further.
Matching documents with logical expressions:
```
shopname AND (product1 OR product2)
```
Matching specific tags, correspondents or types:
```
type:invoice tag:unpaid
correspondent:university certificate
```
Matching dates:
```
created:[2005 to 2009]
added:yesterday
modified:today
```
Matching inexact words:
```
produ*name
```
!!! note
Inexact terms are hard for search indexes. These queries might take a
while to execute. That's why paperless offers auto complete and query
correction.
All of these constructs can be combined as you see fit. If you want to
learn more about the query language used by paperless, paperless uses
Whoosh's default query language. Head over to [Whoosh query
language](https://whoosh.readthedocs.io/en/latest/querylang.html). For
details on what date parsing utilities are available, see [Date
parsing](https://whoosh.readthedocs.io/en/latest/dates.html#parsing-date-queries).
## Keyboard shortcuts / hotkeys
A list of available hotkeys can be shown on any page using <kbd>Shift</kbd> +
<kbd>?</kbd>. The help dialog shows only the keys that are currently available
based on which area of Paperless-ngx you are using.
## The recommended workflow {#usage-recommended-workflow}
Once you have familiarized yourself with paperless and are ready to use
it for all your documents, the recommended workflow for managing your
documents is as follows. This workflow also takes into account that some
documents have to be kept in physical form, but still ensures that you
get all the advantages for these documents as well.
The following diagram shows how easy it is to manage your documents.
{width=400}
### Preparations in paperless
- Create an inbox tag that gets assigned to all new documents.
- Create a TODO tag.
### Processing of the physical documents
Keep a physical inbox. Whenever you receive a document that you need to
archive, put it into your inbox. Regularly, do the following for all
documents in your inbox:
1. For each document, decide if you need to keep the document in
physical form. This applies to certain important documents, such as
contracts and certificates.
2. If you need to keep the document, write a running number on the
document before scanning, starting at one and counting upwards. This
is the archive serial number, or ASN in short.
3. Scan the document.
4. If the document has an ASN assigned, store it in a _single_ binder,
sorted by ASN. Don't order this binder in any other way.
5. If the document has no ASN, throw it away. Yay!
!!! tip
Instead of writing a number on the document by hand, you may also prepare
a spool of labels with barcodes with an ascending serial number, that are
formatted like `ASN00001`.
This also enables Paperless to automatically parse and process the ASN
(if enabled in the config), so that you don't need to manually assign it.
Over time, you will notice that your physical binder will fill up. If it
is full, label the binder with the range of ASNs in this binder (i.e.,
"Documents 1 to 343"), store the binder in your cellar or elsewhere,
and start a new binder.
The idea behind this process is that you will never have to use the
physical binders to find a document. If you need a specific physical
document, you may find this document by:
1. Searching in paperless for the document.
2. Identify the ASN of the document, since it appears on the scan.
3. Grab the relevant document binder and get the document. This is easy
since they are sorted by ASN.
### Processing of documents in paperless
Once you have scanned in a document, proceed in paperless as follows.
1. If the document has an ASN, assign the ASN to the document.
2. Assign a correspondent to the document (i.e., your employer, bank,
etc) This isn't strictly necessary but helps in finding a document
when you need it.
3. Assign a document type (i.e., invoice, bank statement, etc) to the
document This isn't strictly necessary but helps in finding a
document when you need it.
4. Assign a proper title to the document (the name of an item you
bought, the subject of the letter, etc)
5. Check that the date of the document is correct. Paperless tries to
read the date from the content of the document, but this fails
sometimes if the OCR is bad or multiple dates appear on the
document.
6. Remove inbox tags from the documents.
!!! tip
You can setup manual matching rules for your correspondents and tags and
paperless will assign them automatically. After consuming a couple
documents, you can even ask paperless to *learn* when to assign tags and
correspondents by itself. For details on this feature, see
[advanced matching](advanced_usage.md#matching).
### Task management
Some documents require attention and require you to act on the document.
You may take two different approaches to handle these documents based on
how regularly you intend to scan documents and use paperless.
- If you scan and process your documents in paperless regularly,
assign a TODO tag to all scanned documents that you need to process.
Create a saved view on the dashboard that shows all documents with
this tag.
- If you do not scan documents regularly and use paperless solely for
archiving, create a physical todo box next to your physical inbox
and put documents you need to process in the TODO box. When you
performed the task associated with the document, move it to the
inbox.
## Architecture
Paperless-ngx consists of the following components:
- **The webserver:** This serves the administration pages, the API,
and the new frontend. This is the main tool you'll be using to interact
with paperless. You may start the webserver directly with
```shell-session
$ cd /path/to/paperless/src/
$ gunicorn -c ../gunicorn.conf.py paperless.wsgi
```
or by any other means such as Apache `mod_wsgi`.
- **The consumer:** This is what watches your consumption folder for
documents. However, the consumer itself does not really consume your
documents. Now it notifies a task processor that a new file is ready
for consumption. I suppose it should be named differently. This was
also used to check your emails, but that's now done elsewhere as
well.
Start the consumer with the management command `document_consumer`:
```shell-session
$ cd /path/to/paperless/src/
$ python3 manage.py document_consumer
```
- **The task processor:** Paperless relies on [Celery - Distributed
Task Queue](https://docs.celeryq.dev/en/stable/index.html) for doing
most of the heavy lifting. This is a task queue that accepts tasks
from multiple sources and processes these in parallel. It also comes
with a scheduler that executes certain commands periodically.
This task processor is responsible for:
- Consuming documents. When the consumer finds new documents, it
notifies the task processor to start a consumption task.
- The task processor also performs the consumption of any
documents you upload through the web interface.
- Consuming emails. It periodically checks your configured
accounts for new emails and notifies the task processor to
consume the attachment of an email.
- Maintaining the search index and the automatic matching
algorithm. These are things that paperless needs to do from time
to time in order to operate properly.
This allows paperless to process multiple documents from your
consumption folder in parallel! On a modern multi core system, this
makes the consumption process with full OCR blazingly fast.
The task processor comes with a built-in admin interface that you
can use to check whenever any of the tasks fail and inspect the
errors (i.e., wrong email credentials, errors during consuming a
specific file, etc).
- A [redis](https://redis.io/) message broker: This is a really
lightweight service that is responsible for getting the tasks from
the webserver and the consumer to the task scheduler. These run in a
different process (maybe even on different machines!), and
therefore, this is necessary.
- Optional: A database server. Paperless supports PostgreSQL, MariaDB
and SQLite for storing its data.