[SumatraPDF](https://www.sumatrapdfreader.org/) is a free [PDF, EPUB, MOBI, CHM, XPS, DjVu, CBZ and CBR](Supported-document-formats.md) 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](https://grok.com/?q=Read%20this%20page%20from%20the%20SumatraPDF%20docs%3A%20https%3A%2F%2Fwww.sumatrapdfreader.org%2Fdocs%2FSumatraPDF-all-docs-for-llm-ai.md%20and%20answer%20questions%20about%20the%20content.), [ChatGPT](https://chatgpt.com/?q=Read%20this%20page%20from%20the%20SumatraPDF%20docs%3A%20https%3A%2F%2Fwww.sumatrapdfreader.org%2Fdocs%2FSumatraPDF-all-docs-for-llm-ai.md%20and%20answer%20questions%20about%20the%20content.), or [Claude](https://claude.ai/new?q=Read%20this%20page%20from%20the%20SumatraPDF%20docs%3A%20https%3A%2F%2Fwww.sumatrapdfreader.org%2Fdocs%2FSumatraPDF-all-docs-for-llm-ai.md%20and%20answer%20questions%20about%20the%20content.).

## Documentation for users

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[FAQ / troubleshooting](FAQ.md)

[Version history](Version-history.md)

[Installation](Installation.md)

[Command Palette](Command-Palette.md)

[Keyboard shortcuts](Keyboard-shortcuts.md)

[Customize keyboard shortcuts](Customize-keyboard-shortcuts.md)

[Tabs and windows](Tabs-and-windows.md)

[Finding text](Finding-text.md)

[Hyperlinks](Hyperlinks.md)

[Scrolling, zooming, navigating](Scrolling-and-zooming.md)

[Managing favorites](Managing-favorites.md)

[Editing annotations](Editing-annotations.md)

[AI Chat with document](AI-Chat-with-document.md)

[Printing](Printing.md)

[Read Aloud (TTS)](Read-Aloud.md)

[Commands](Commands.md)

[Command-line arguments](Command-line-arguments.md)

[Customize toolbar](Customize-toolbar.md)

[Customize UI colors / theme](Customize-theme-colors.md)

[Customize external viewers](Customize-external-viewers.md)

[Customize search / translation services](Customize-search-translation-services.md)

[LaTeX integration](LaTeX-integration.md)

[Advanced options / settings](Advanced-options-settings.md)

[DDE Commands](DDE-Commands.md)

[Set as default PDF viewer](Set-as-default-pdf-viewer.md)

[Configure for restricted use](Configure-for-restricted-use.md)

[Supported document formats](Supported-document-formats.md)

[Comics and manga](Comics-and-manga.md)

[CAD / Engineering Drawings](CAD-Engineering-Drawings.md)

[Convert to PDF](Convert-to-PDF.md) (comics, image folders, images → multi-page PDF)

[Customize eBook UI](Customize-eBook-UI.md)

[Accessibility](Accessibility.md)

[How we store settings](How-we-store-settings.md)

[Installer cmd-line arguments](Installer-cmd-line-arguments.md)

[Uninstalling SumatraPDF](Uninstalling-SumatraPDF.md)

[Portable vs installer](SumatraPDF-portable.md)

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## Using SumatraPDF to convert and modify PDF and other files

Starting in [pre-release 3.7](https://www.sumatrapdfreader.org/prerelease) you can use `sumatrapdf-tool.exe <tool> <option> <files>` or [SumatraPDF.exe <tool>](Tools.md) to convert, extract, search PDF and other files.

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[All cmd-line tools](Tools.md)

[draw](Tool-draw.md)

[convert](Tool-convert.md)

[audit](Tool-audit.md)

[bake](Tool-bake.md)

[clean](Tool-clean.md)

[extract](Tool-extract.md)

[info](Tool-info.md)

[merge](Tool-merge.md)

[pages](Tool-pages.md)

[poster](Tool-poster.md)

[recolor](Tool-recolor.md)

[show](Tool-show.md)

[trim](Tool-trim.md)

[grep](Tool-grep.md)

[trace](Tool-trace.md)

[run](Tool-run.md)

[run JavaScript examples](Tool-run-javascript-examples.md)

[run JavaScript API reference](Tool-run-javascript-reference.md)

[Extract text from PDF](Tool-x-extract-text-from-pdf.md)

[Convert text file to a PDF](Tool-x-convert-text-to-pdf.md)

[Convert PNG image to a PDF](Tool-x-convert-png-to-pdf.md)

[Convert to PDF (GUI: comics / images)](Convert-to-PDF.md)

[Convert PDF to Images](Convert-PDF-to-images.md)

[Compress a PDF](Tool-x-compress-pdf.md)

[Decompress a PDF](Tool-x-decompress-pdf.md)

[Encrypt a PDF](Tool-x-encrypt-pdf-with-password.md)

[Decrypt a PDF](Tool-x-decrypt-pdf.md)

[Delete pages from PDF](Tool-x-delete-pages-from-pdf.md)

[Extract pages from PDF](Tool-x-extract-pages-from-pdf.md)

[Extract images from PDF](Tool-x-extract-images-from-pdf.md)

[Search text in a PDF](Tool-x-search-pdf.md)

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## Misc docs

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[Contribute translation](Contribute-translation.md)

[How to submit bug reports](How-to-submit-bug-reports.md)

[Submit crash report](Submit-crash-report.md)

[Reporting printing bugs](Reporting-printing-bugs.md)

[Update check doesn't work?](Update-check-doesnt-work.md)

[Failed to load libsumatrapdf.dll](Failed-to-load-libmupdf.md)

[Corrupted installation](Corrupted-installation.md)

[Why only Windows?](Why-only-Windows.md)
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## Downloads

- [latest stable release](https://www.sumatrapdfreader.org/download-free-pdf-viewer)
- [pre-release builds](https://www.sumatrapdfreader.org/prerelease) (latest features, potentially buggy)

## Feedback

Found a bug? Have a feature request? Submit it via the [issue tracker](https://github.com/sumatrapdfreader/sumatrapdf/issues) and [vote for features](https://sumatrapdf.userjot.com) you want to see next.

Have feedback or a question? Discuss it in the [forum](https://github.com/sumatrapdfreader/sumatrapdf/discussions).

Want to make SumatraPDF work better in your language? [Contribute a translation.](Contribute-translation.md)