SumatraPDF documentation

SumatraPDF is a free PDF, EPUB, MOBI, CHM, XPS, DjVu, CBZ and CBR reader for Windows. It’s small, fast, customizable and full of features.

Using AI? You can ask an AI assistant questions about SumatraPDF. Ask Grok, ChatGPT, or Claude.

Documentation for users #

Using SumatraPDF to convert and modify PDF and other files #

Starting in pre-release 3.7 you can use sumatrapdf-tool.exe <tool> <option> <files> or SumatraPDF.exe to convert, extract, search PDF and other files.

Misc docs #

Contribute translation

How to submit bug reports

Submit crash report

Reporting printing bugs

Update check doesn’t work?

Failed to load libsumatrapdf.dll

Corrupted installation

Why only Windows?

Downloads #

latest stable release
pre-release builds (latest features, potentially buggy)

Feedback #

Found a bug? Have a feature request? Submit it via the issue tracker and vote for features you want to see next.

Have feedback or a question? Discuss it in the forum.

Want to make SumatraPDF work better in your language? Contribute a translation.