The current version of PAC (PDF Accessibility Checker) is 26.1.0.0 (as of 18/08/2026). patchletter checks the official source daily and emails you new releases.
PAC (PDF Accessibility Checker) at a glance
PAC (PDF Accessibility Checker) is a free validation tool provided by axes4 GmbH for testing the accessibility of PDF documents. It is widely regarded as a de-facto standard validator for PDF/UA (ISO 14289-1) and additionally covers numerous WCAG success criteria through automated and semi-automated checks. It is commonly used by government agencies, educational institutions, and organizations that must meet legal digital accessibility requirements as part of document release or quality-assurance workflows.
The tool is released in named yearly editions that, at irregular intervals, introduce new test rules, a revised rule set, or additional functionality such as AI-assisted support for manual review steps. Between major editions, occasional bug fixes and minor adjustments to the checking logic are published.
For administrators it is relevant that PAC is distributed as a Windows application (sometimes run via Wine on macOS/Linux) and has no automatic update mechanism comparable to a package manager; new versions must be downloaded manually from the vendor's website. When moving to a new yearly edition, changes to the rule set should be reviewed, since PDFs previously classified as compliant may be re-evaluated differently after a rule-set update.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 26.1.0.0 | STABLE | 18/08/2026 | Release notes → |
| 26.0.0.0 | STABLE | 18/08/2026 | Release notes → |
| 24.4.4.0 | STABLE | 18/08/2026 | Release notes → |
| 24.4.3.0 | STABLE | 18/08/2026 | Release notes → |
| 24.4.2.0 | STABLE | 18/08/2026 | Release notes → |
Frequently asked questions
- What is the latest version of PAC (PDF Accessibility Checker)?
- PAC (PDF Accessibility Checker) 26.1.0.0, released 18/08/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the PAC (PDF Accessibility Checker) release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new PAC (PDF Accessibility Checker) updates?
- Tick PAC (PDF Accessibility Checker) off in the catalogue and leave your address. From then on new versions go out by email — one at a time, or bundled in the daily or weekly digest.
An email as soon as a new PAC (PDF Accessibility Checker) version ships
We reconcile the vendor source daily. When a new version appears, it lands in your inbox right away or bundled as a digest. The update email is free and ends with one click. Alerts about vulnerabilities and end of support are part of patchletter Pro.
Embed this badge
The badge shows the current PAC (PDF Accessibility Checker) version and keeps it up to date. Anyone may embed it, no account needed.
[](https://patchletter.com/en/software/pac-pdf-accessibility-checker)https://patchletter.com/badge/pac-pdf-accessibility-checker.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
