Bug fixes, feature additions, tests, documentation and more can be contributed via [issues](https://github.com/python-pillow/Pillow/issues) and/or [pull requests](https://github.com/python-pillow/Pillow/pulls). All contributions are welcome.
Please send a pull request to the master branch. Please include [documentation](https://pillow.readthedocs.io) and [tests](../Tests/README.rst) for new features. Tests or documentation without bug fixes or feature additions are welcome too. Feel free to ask questions [via issues](https://github.com/python-pillow/Pillow/issues/new), [Gitter](https://gitter.im/python-pillow/Pillow) or irc://irc.freenode.net#pil
- Run the test suite on Python 2.7 and 3.x. You can enable [Travis CI](https://travis-ci.org/profile/) and [AppVeyor](https://ci.appveyor.com/projects/new) on your repo to catch test failures prior to the pull request, and [Codecov](https://codecov.io/gh) to see if the changed code is covered by tests.
When reporting issues, please include code that reproduces the issue and whenever possible, an image that demonstrates the issue. Please upload images to GitHub, not to third-party file hosting sites. If necessary, add the image to a zip or tar archive.
The best reproductions are self-contained scripts with minimal dependencies. If you are using a framework such as plone, Django, or buildout, try to replicate the issue just using Pillow.
To report sensitive vulnerability information, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
If your organisation/employer is a distributor of Pillow and would like advance notification of security-related bugs, please let us know your preferred contact method.
