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 agents (Grok, ChatGPT, Claude etc.) to ask questions about SumatraPDF? Tell them to read SumatraPDF all docs for llms first.

Staring in pre-release 3.7 you can use sumatrapdf-tool.exe <tool> <option> <files> commands to convert, extract, search PDF and other files. sumatrapdf-tool.exe is installed next to SumatraPDF.exe, so this only works after SumatraPDF has been installed.

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

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