Since many projects will need special features in their documentation, Sphinx allows adding “extensions” to the build process, each of which can modify almost any aspect of document processing.

This chapter describes the extensions bundled with Sphinx. For the API documentation on writing your own extension, refer to Developing extensions for Sphinx.

Built-in extensions

These extensions are built in and can be activated by respective entries in the extensions configuration value:

Third-party extensions


This should reference the GitHub organization now

You can find several extensions contributed by users in the Sphinx Contrib repository. It is open for anyone who wants to maintain an extension publicly; just send a short message asking for write permissions.

There are also several extensions hosted elsewhere. The Sphinx extension survey and awesome-sphinxdoc contains a comprehensive list.

If you write an extension that you think others will find useful or you think should be included as a part of Sphinx, please write to the project mailing list (join here).

Where to put your own extensions?

Extensions local to a project should be put within the project’s directory structure. Set Python’s module search path, sys.path, accordingly so that Sphinx can find them. For example, if your extension foo.py lies in the exts subdirectory of the project root, put into conf.py:

import sys, os


extensions = ['foo']

You can also install extensions anywhere else on sys.path, e.g. in the site-packages directory.