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PDF Accessibility Checker

Check tags, alt text, language, title, headings, table headers, tab order and real text.

Free, no uploads, no sign-up. Runs 100% in your browser.

How PDF Accessibility Checker works

pdf-lib walks the structure tree to count figures with alt text, headings and table headers, and checks language, title and tab order. PDF.js checks which pages have real text.

Input: PDF.

How to use PDF Accessibility Checker

1. Drop your PDF onto the PDF Accessibility Checker area, or click to choose it.
2. Wait a moment while page thumbnails render locally.
3. Choose the pages and options you need. Previews update as you go.
4. Press the main action button and download the finished PDF.

Tips

• Encrypted PDFs must be unlocked first with Unlock PDF.
• Large scanned PDFs are mostly images. Compress PDF shrinks them the most.
• Your original file is never modified; you always download a new copy.

PDF Accessibility Checker FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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