veraPDF

veraPDF is a free, open-source tool for checking PDF/A and machine-checkable PDF/UA conformance. It is strongest for preservation teams, memory institutions and developers who need repeatable checks in a document workflow. Its focus on validation and policy leaves manual accessibility review to other tools and processes.

Overview

For teams working with PDF collections, veraPDF covers all PDF/A parts and conformance levels, plus machine checks for PDF/UA parts 1 and 2. That breadth makes it useful for consistent conformance screening, but it is not a complete accessibility assessment: there are no manual review tools or mobile testing.

The project is led by the Open Preservation Foundation and the PDF Association, with assistance from the Digital Preservation Coalition. It is licensed under GPLv3 or later, or MPLv2 or later; organizations should choose the terms that fit their own use and distribution.

Key features

Validation and policy checking

The Implementation Checker validates PDF/A and runs machine-checkable PDF/UA checks. The Policy Checker evaluates PDF Features Reports against institutional policy profiles, allowing organizations to apply their own rules alongside standard conformance targets. That is a practical advantage for institutions with collection-specific requirements, though it does not replace human review of accessibility.

Reporting and metadata repair

The Reporter converts machine-readable output from the Implementation Checker, Policy Checker and Metadata Fixer into other forms for downstream use. The Metadata Fixer is deliberately narrow: it can remove an incorrect PDF/A flag or repair broken XMP when that is the sole barrier to a legitimate flag. It can resolve these specific metadata problems, not serve as a general-purpose PDF repair tool.

Developer integration and trust

Teams can use a desktop GUI, command-line application or Java validation library distributed through Maven. Plugins can add third-party feature-extraction tools to PDF Features Reports, which gives developers a way to extend reporting workflows. Downloads include GPG signatures and instructions for verifying installer integrity against the published key fingerprint.

Pricing

Plan	Price	What it includes
veraPDF	free	Free, open-source validator; downloadable release and development builds. Development builds may contain bugs or unfinished features.

There is no paid tier or free-trial period in this plan structure. The release builds suit organizations seeking a no-cost validator; development builds are better treated as early versions, since they may lack features and come without support or guarantees. The dual GPLv3-or-later and MPLv2-or-later licensing also warrants review before incorporating the library into distributed software.

Platforms

veraPDF is available for Linux, macOS and Windows, as well as through an API. Desktop installers require Java 8 or later, a requirement that may complicate deployment on systems without a suitable Java runtime. CI/CD integration supports automated workflows. There is no browser extension or mobile testing.

Who it's for

Digital preservationists and memory institutions are central users: they can apply PDF/A checks across collections and evaluate document features against institutional policy. Developers can use the Java library, command-line application, API and test files to incorporate or assess validation in software workflows. Choose another tool or add a manual review process if the goal is to assess accessibility beyond machine-checkable PDF/UA criteria.

Pros and cons

• Pro: Checks every PDF/A part and conformance level, useful for teams with varied archival requirements.
• Pro: Policy profiles, report transformation and plugin support help fit validation into institution-specific workflows.
• Pro: Free, open-source desktop, command-line and Java options cover both individual and developer use.
• Con: PDF/UA support is limited to machine checks, with no manual review tools or mobile testing.
• Con: Desktop installers require Java 8 or later.
• Con: Development builds may be buggy or incomplete and carry no support or guarantees.

Alternatives

For a broader set of PDF accessibility tools, browse PDF Accessibility Software or Accessibility Testing Software.

• PDFix Desktop is worth considering when PDF/UA validation and WCAG 2.1/2.2, Section 508 or European Accessibility Act checks are priorities; its Desktop Lite plan is freemium.
• Grackle GO may fit users who prefer a free cross-platform option; its free plan caps files at 25 MB and unauthenticated use at 10 validations per hour.
• Normfluss is another freemium option for accessibility checks, with a free check plan for one PDF without an account.
• PDFAccessibility.ai may suit users seeking accessible PDF exports as well as checks: its free plan allows 10 exports, unlimited checks and uploads up to 10 MB, with files retained for 7 days.
• DocAccessible offers a free plan with monthly document and case limits, plus an Exchange plan at $19 per mo.
• Fruition PDF Accessibility is an option for structural remediation; its free plan covers 10 pages per month.
• Nutrient DWS Accessibility API may suit API or self-hosted workflows; its free plan allows 20 auto-tagged pages and 100 validations per month, while Starter costs $79 a month.
• PAVE 2.0 is another free option, available on the web.

Verdict

Choose veraPDF if you need a free, extensible validator for PDF/A collections or machine-checkable PDF/UA requirements, especially in preservation or developer workflows. Its policy checks and integration options are meaningful strengths; look elsewhere or add manual review when accessibility assessment must go beyond automated checks.