# SumatraPDF (open-source PDF tool)

> SumatraPDF is a free, open-source PDF tool for Windows. SumatraPDF is a multi-format (PDF, EPUB, MOBI, CBZ, CBR, FB2, CHM, XPS, DjVu) reader for Windows under (A)GPLv3 license, with some code under BSD license (see AUTHORS). It has 17,717 GitHub stars and is released under the GPL-3.0 license, and people use it instead of Adobe Acrobat Reader.

SumatraPDF is a multi-format (PDF, EPUB, MOBI, CBZ, CBR, FB2, CHM, XPS, DjVu) reader for Windows under (A)GPLv3 license, with some code under BSD license (see AUTHORS).

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/sumatrapdfreader/sumatrapdf |
| Platforms | Windows |
| Interface | desktop GUI |
| GitHub stars | 17,717 |
| License | GPL-3.0 (open source) |
| Replaces | Adobe Acrobat Reader |
| Language | C |
| Website | none listed |
| Official | yes (published by the project behind the app) |
| Category | PDF editors & tools |
| Latest release | 3.6.1rel (Apr 6, 2026) |
| Last commit | Oct 7, 2026 |

## Install

Download a build for your system from the project's releases (https://github.com/sumatrapdfreader/sumatrapdf/releases) or website, or build it from source by following the README.

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