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A free, open-source expert system for guided interviews and document assembly, based on Python, YAML, and Markdown.

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What is docassemble?

docassemble is a free, open-source expert system for guided interviews and document assembly. It provides a web site that conducts interviews with users. Based on the information gathered, the interviews can present users with documents in PDF, RTF, or DOCX format, which users can download or e-mail.

Though the name emphasizes the document assembly feature, docassemble interviews do not need to assemble a document; they might submit an application, direct the user to other resources on the internet, store user input, interact with APIs, or simply provide the user with information.

docassemble was created by a lawyer/computer programmer for purposes of automating the practice of law, but it is a general-purpose platform that can find applications in a variety of fields.



Compose your templates in .docx (with help of a Word Add-in) or .pdf files. Synchronize files with your server using Google Drive or OneDrive.


Gather touchscreen signatures and embed them in documents.

Live chat

Assist users in real time with live chat, screen sharing, and remote screen control.


Use machine learning to process user input.


Send text messages to your users or use the SMS interface as an alternative to the web interface.


Send and receive e-mails in your interviews. (You can send faxes, too.)


Use optical character recogntion to process images uploaded by the user.


Offer interviews in multiple languages.


Develop applications that involve more than one user, such as mediation or counseling interviews.


Use the power of Python to extend the capabilities of your interviews.


Package your interviews and use GitHub and PyPI to share your work with the docassemble user community.

Background Tasks

Do things behind the scenes of the interview, even when the user is not logged in.


Deploy your interviews on multiple machines to handle high traffic.


Protect user information with server-side encryption, two-factor authentication, document redaction, and other security features.


Integrate with third-party applications using the API, or send your interviews input and extract output using code.

Responsive Design

Based on Bootstrap

Photo of mobile version
Photo of desktop version

Writing in Plain Text

Interviews are developed as YAML files. Within the YAML files, the text of the interview questions and documents is formatted with Markdown, and the logic of the interview flow is expressed with if/then/else statements in Python.

question: |
  What is your favorite number?
  Favorite number: best_number
  datatype: number
question: |
  % if best_number == 42:
  That's **my** favorite number!
  % else:
  What a _lousy_ favorite number.
  % endif
mandatory: True
Screenshot of yaml-markdown-python example

YAML, Markdown, and Python? Sounds scary!

YAML is a text format for expressing information in a way that is both human-readable and machine readable.

food: bread
  - flour
  - yeast
  - water
  - salt

Markdown is a text format for expressing typographical formatting. For example, if you write this Markdown text:

It is *very* important that you obtain your
[free credit report]( as soon
as possible.

then you get text that looks like this:

It is very important that you obtain your free credit report as soon as possible.

Python is a language designed to be readable and easy to learn. Interview developers do not need to have any prior experience with Python or computer programming in order to create docassemble interviews. The only Python statements developers may need to write are if/then/else statements that are very close to plain English. For example:

if user.is_citizen or user.is_legal_permanent_resident:
  user.is_eligible = True
  user.is_eligible = False

Support is available

Although docassemble has extensive documentation, you may have questions about how to use it. To get help from the community of developers and other users, you can chat in real time with knowledgeable developers on the docassemble Slack group. If you find a bug, you can submit an issue on GitHub.

Every year since 2018, the docassemble community has convened for Docacon, a global docassemble conference. There have also been sessions on docassemble at a variety of conferences on law and technology.

No Flowcharts

Interview developers do not have to design the “flow” of the interview; docassemble will automatically determine what questions to ask, and the order in which to ask them, based on what information is necessary to gather. The system will refrain from asking unnecessary questions. For example, if the interview contains a conditional statement such as:

if user.is_disabled or user.age > 60:
  special_funding_exists = True
  special_funding_exists = False

then the user will be asked if he is disabled, and will only be asked for his age if he says he is not disabled. Developers need to provide a question for every variable (e.g., there need to be questions that determine user.is_disabled and user.age) but docassemble will automatically figure out when and whether to ask those questions.

This allows developers to concentrate on the end result rather than worrying about how to construct the interview process. Developers who are lawyers can “practice at the top of their license” by spending their time thinking about the law (a lawyer function) rather than thinking about the interview process (a non-lawyer function).

Though this automatic interview flow is a powerful feature, sometimes interview developers have a particular preference about the order of questions. docassemble allows them to use the automatic system as much or as little as they want; if they want to dictate a specific order of questions, they can do so.

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Designed and built by Jonathan Pyle
Code licensed under MIT, documentation under CC BY 3.0.