Free Accessibility Spot-Check
PDF accessibility checker online free
A quick, browser-based check for a few structural accessibility signals in a PDF — tagged structure, language, and title metadata. This is a spot-check, not a full compliance audit; see the notes on the tool and in the FAQ below.
Browser-based accessibility spot-check
Open a PDF for a quick, automated check of a few structural accessibility signals. This is not a full compliance audit — see the note below.
Your files are handled safely
✔ Processing happens in your browser
✔ Your file is never uploaded to a server
✔ Your files are not stored or saved anywhere
✔ No account or sign-up required
Why Use It
Common reasons to run a spot-check
Quick first pass
Catch obvious gaps — like a missing tagged structure — before a deeper review.
No account or upload
The check runs entirely in your browser against the file's own internal structure.
Plain-language results
Each check explains what it found and why it matters, without jargon.
How It Works
Simple 3-step workflow
1. Choose your PDF
Choose the PDF file you want to check.
2. Run the check
The tool inspects the file's internal structure for a few key signals.
3. Review the results
Each check explains what was found and why it matters.
Honest Limits
A spot-check, not a certification
A free browser tool can check a handful of machine-readable signals, but it cannot verify everything a full accessibility audit covers — alt text quality, correct reading order, color contrast, and WCAG/PDF-UA conformance all need deeper tools or manual review with a screen reader.
FAQ
Accessibility checker questions
Does this guarantee my PDF is accessible?
No. It checks a handful of structural signals only — tagged structure, language, title metadata, and a MarkInfo flag. It does not verify alt text quality, reading order correctness, color contrast, or full WCAG/PDF-UA conformance.
What should I use for a full accessibility audit?
Tools like Adobe Acrobat's built-in accessibility checker, or manual testing with a screen reader, are better suited to a thorough compliance review.
What does “tagged structure” mean?
A tagged PDF includes a structure tree that tells assistive technology how to interpret headings, paragraphs, images, and reading order. Untagged PDFs are much harder for screen readers to interpret.
Is my file uploaded to a server?
No. The check runs entirely in your browser. Nothing is uploaded or stored.