The free PAC PDF Accessibility Checker helps you assess your documents.
PAC is the globally used, free PDF accessibility checking tool that has been tried and tested since 2010. PAC can check many PDF/UA and WCAG requirements at the touch of a button. In addition to this, PAC also supports the required visual check.
Improvements
- Significantly improved AI model providing more reliable results—especially for images, but across all other elements as well.
- AI testing can now be disabled via a registry key.
- The AI tab no longer displays errors; it now only shows warnings.
Bug fixes
- Various minor bug fixes and improvements.
| Publisher | axes4 GmbH |
|---|---|
| Version | 26.1.0.0 |
| Release date | 2026-03-25 |
| License | Proprietary |
| Installer type | burn |
| Architecture | x86 |
| Package ID | axes4.PAC |
| Install scope | Current user |
winget install --id=axes4.PAC -ewinget upgrade --id=axes4.PAC -ewinget uninstall --id=axes4.PAC -e"PAC_Setup.26.1.0.0.exe" /quiet /norestart ACCEPT_AXES4_EULA=1PDF Accessibility Checker (PAC) 2026 is proprietary software from axes4 GmbH. Check the publisher's license terms for pricing and usage rights.
The latest version is 26.1.0.0, released on Mar 25, 2026.
The download button links to the official installer published on pac.pdf-accessibility.org, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with 662daebd399f5f4d04c936df2e9574118a062d87334460a20eac164ed14367fd.
PDF Accessibility Checker (PAC) 2026 runs on Windows and is available for 32-bit (x86) systems.
Run the offline installer with "PAC_Setup.26.1.0.0.exe" /quiet /norestart ACCEPT_AXES4_EULA=1, or install it with Windows Package Manager: winget install --id=axes4.PAC -e --silent.
Open Settings › Apps › Installed apps, find PDF Accessibility Checker (PAC) 2026 and select Uninstall. From the command line, run winget uninstall --id=axes4.PAC -e.
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