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PAC 2026 beta with AI-assisted checks is here!

PAC 2026 takes PDF accessibility testing to a new level.

For years, PAC has been a globally recognized standard product for machine-based testing according to the Matterhorn Protocol.

In the new 2026 version, PAC now also supports you with the human evaluation tasks through integrated AI.

Learn more about PAC 2026 and the AI-assisted checks here.

PAC 2026 beta for end users

If you want to try out PAC 2026 beta on your computer, you should download this setup file. You don’t need administrator rights on your computer to install PAC.
PAC_2026_Beta1.exe (EXE, 132 MB)

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    PAC 2026 beta for administrative installations

    If you are a system administrator and want to deploy PAC 2026 on multiple computers, you can use this MSI file.
    Please note section 7.2 of our General Terms before distributing PAC within your network.

    Download PAC 2026 Beta 1.msi

    PAC 2024.4.4

    Here you can download the current full version of PAC free of charge and without registration. In addition, we can keep you up to date with updates or new resources on checking for PDF accessibility.
    Download PAC 2024.4.4 (ZIP, 76 MB)

    One second ...

    Just a few seconds separate you from testing with PAC. Want to stay up to date with PAC updates and resources? Then sign up for our update list.

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      In some cases, an anti-virus program on your computer may block the above download. PAC is 100% virus-free and safe; it is only blocked because the ZIP file contains an executable file (*.exe) and some antivirus programs consider this to be a danger.

      In this case, you can download a ZIP file "encrypted" with the password 1234 here:

      Download PAC 2024.4.4 with password 1234

      EULA

      By downloading and using PAC, you agree to our General Terms.

       

      Current version 

      16 October 2025: 24.4.4.0 – Release notes

       

      System requirements

      Supported operating systems

      • Windows 10
      • Windows 11

      Additional requirements

      Microsoft .NET Framework 4.8 and higher

      Accessibility Conformance Report (VPAT)

      The PAC user interface is mostly, but not completely, accessible. Read the Accessibility Conformance Report that we have commissioned.
      PAC Accessibility Conformance Report.pdf (PDF)

      PAC update notification

      You can register for our PAC update notification so that you are always informed immediately when there is a new version of PAC. Click on the button "PAC Update" below to start your subscription.

      PAC Update

      Earlier versions of PAC

      We generally recommend that you use the latest version of PAC. If you are unable to do this or would like to get to know previous versions of PAC, we have compiled the downloads for you here.

      PAC 2021

      Version 2021 supported testing according to WCAG 2.1 AA success criteria for the first time. In this context, a new color contrast check was implemented.

      Download (ZIP, 58 MB)

      PAC 3

      Version 3 included for the first time a printable summary report in the form of an accessible PDF which is often used as proof of quality.

      Download (ZIP, 27 MB)