Free PDF Accessibility Checker Online — Unlimited, No Signup

A PDF accessibility checker scans your document against accessibility standards — primarily WCAG 2.1, PDF/UA (ISO 14289), and Section 508 — and flags issues that prevent people with disabilities from reading or navigating the file. Common issues include missing tags, absent alt text on images, incorrect reading order, no document language, and broken heading hierarchy. Automated checkers catch machine-verifiable failures instantly; some items (like whether alt text is meaningful) still require human review.

Upload your PDF to NeatPDF's free accessibility checker above. The tool inspects your document's structural foundations — tagging, title, language, structure tree, bookmarks, and metadata — and returns a pass/fail report in seconds. No software installation or account required. For a thorough audit, use this as a first pass, then manually verify content-level items like alt text quality and reading order.

PDF/UA stands for PDF Universal Accessibility — it is the ISO standard (ISO 14289) that defines technical requirements for accessible PDFs. A PDF/UA-compliant document can be reliably read by screen readers and braille displays. WCAG is a broader web standard that also applies to PDFs. PDF/UA is more specific and technically rigorous; satisfying PDF/UA generally satisfies WCAG requirements for PDFs as well.

Yes, in many jurisdictions. In the US, Section 508 requires federal agencies to publish accessible documents. The ADA requires accessible digital content, with state and local governments required to comply by April 24, 2026 under Title II. In the EU, the European Accessibility Act (enforced since June 2025) covers digital products and services. Non-compliance can result in fines up to $75,000 per violation (US) or €100,000 (EU) and costly litigation — over 5,000 digital accessibility lawsuits were filed in the US in 2025 alone.

The quick scan checks 6 key structural requirements from the Matterhorn Protocol: (1) document is tagged (MarkInfo/Marked), (2) structure tree root exists, (3) document title is set, (4) document language is declared, (5) bookmarks exist for long documents, and (6) XMP metadata is present. These are the foundational checks that every accessible PDF must pass. Results are grouped by severity — Critical, Minor, Best Practice — with plain-language fix guidance for each issue. A full content-level audit (alt text, reading order, heading hierarchy) requires the deep scan, coming soon.

No — and any tool that claims otherwise is misleading. Automated checkers verify about 65% of accessibility requirements: Is a tag present? Is a language set? Is there alt text? But they cannot judge whether alt text is meaningful, whether reading order makes sense, or whether a table is truly navigable. Use this tool to catch issues quickly, then do a manual review of complex layouts, data tables, and images. Our report clearly separates automated results from items requiring human judgment.

The five most common issues are: (1) Missing tags — the PDF has no structure tree, making it unreadable by screen readers. (2) No alt text on images — screen readers cannot describe charts, graphs, or photos. (3) Incorrect reading order — content is read out of sequence. (4) Missing document language — screen readers cannot apply correct pronunciation. (5) No document title — the browser tab and screen reader show a filename instead of a meaningful title. Most of these are quick fixes once identified.

Yes. Accessibility checking is completely free and unlimited — no daily caps, no account required. To export compliance reports, auto-fix issues, or use batch checking, grab a day pass ($3.99) or upgrade to Pro ($12/month or $99/year).