Check PDF accessibility
Find the accessibility problems in your PDF and see exactly where each one sits on the page. Drag and drop your file below to get started.
Drag and drop a PDF here
Select a PDF to check its tags, alt text and heading structure.
How to check a PDF for accessibility
1. Upload your PDF
Drag and drop the file you want to check. Files up to 50MB are supported for free.
2. Run the check
The document is checked against the machine-verifiable parts of PDF/UA and WCAG: tags, document language and title, alt text, heading order and table headers.
3. See where each issue is
Every finding is drawn as a box on the page it belongs to. Click a finding to jump straight to the element instead of hunting for it.
Why most accessibility checkers stop half way
The free PDF accessibility checkers are good at telling you that a document failed. They are much worse at telling you where. You get a list of rule names, and then you open the file in a separate program and try to work out which paragraph, image or table the rule was talking about.
That gap is the slow part of the job. Finding the element usually takes longer than fixing it, especially in a long document where the same rule fails twenty times in twenty different places.
This tool reports the same machine-checkable rules, but every finding carries the coordinates of the thing that failed, so the problem is highlighted on the page in front of you.
What is checked
Document level: whether the PDF has a tag structure at all, whether it is marked as tagged, whether a document language is set, whether a document title is set, and whether the viewer is told to show that title.
Page level: text that never reaches the tag tree and is therefore invisible to a screen reader, images with no alt text that are not marked as decorative, heading levels that skip a step, and data tables with no header cells.
Content correctly marked as an artifact, such as running headers, page numbers and decorative rules, is not reported. Those are supposed to be excluded from the tag tree, and flagging them is the noise that makes accessibility reports hard to trust.
What a machine cannot check
An automated check can tell you that an image has no alt text. It cannot tell you whether the alt text you wrote actually describes the image, and it cannot tell you whether the reading order makes sense to a person using a screen reader.
Any tool that claims a PDF is fully compliant on the strength of an automated pass is overstating what it did. Treat this check as the part of the work a computer can do reliably, and keep a human review for the rest.
Frequently asked questions
Is this free?
Yes. There is no account, no watermark and no daily limit.
What standards does it check against?
The machine-verifiable parts of PDF/UA (ISO 14289) and WCAG. Rules that require human judgement, such as whether alt text is meaningful, are deliberately left out rather than guessed at.
Does it change my PDF?
No. The check is read only. It reports what it finds and leaves the file exactly as it was.
Why does it say my PDF has no tags?
Scanned documents and PDFs made by printing to PDF usually have no tag structure at all. A screen reader cannot make sense of those, and adding tags is the first fix.
Does it need PDF/UA to pass to be useful?
No. Most documents fail several checks. The point is to see which elements fail and where they are, so you can work through them in order.
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