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Free PDF accessibility checker.
Inspect the PDF itself: tag tree, metadata, figures, tables, lists, forms, and independent PDF/UA rules. Machine evidence stays separate from the checks a person still has to make. The upload is processed for this request and is not retained.
- 01Open the fileSignature, size, and encryption.
- 02Map the tag treeOrder, headings, lists, tables.
- 03Read metadataTitle, language, viewer flags.
- 04Run PDF/UAIndependent machine rules.
- 05Rank findingsFailures first, then human review.
What we check
- Real tag tree and marked content
- Metadata title, language and viewer settings
- Heading hierarchy and custom role mapping
- Figure alternatives and image-only scans
- Table, list, form and annotation structure
- Independent PDF/UA machine validation
What automation cannot prove
- Whether the reading order matches the visible page
- Whether alt text communicates the image's purpose
- Whether tags describe the content correctly
- Whether visual contrast and color use pass
These remain visible as required human-review items, even when machine checks pass.
Accuracy and interpretation
A precise preflight, not an accessibility certificate.
How the result is produced
The checker parses the uploaded PDF, inspects its catalog, metadata, structure tree, marked content, roles, figures, tables, lists, forms, and annotations, then runs the configured PDF/UA validator when that service is available. Each reported item shows whether it passed, failed, could not run, or still requires human review.
What the confidence label means
Confidence describes the completeness of the machine evidence, not the probability that the document conforms. It is reduced when the file cannot be parsed cleanly, validator evidence is unavailable, or important checks could not run. A high-confidence machine result can still contain poor alt text, an incorrect reading order, or unusable visual contrast.
How to use the score
Use the automated risk score to triage work and compare the same file after corrections. Do not compare unrelated documents as if the score were a universal accessibility grade. Release decisions should combine the issue evidence, a PDF/UA validator, visual inspection, keyboard use, and representative screen-reader tasks.
Privacy and limits
The anonymous checker accepts PDFs up to 10 MB, processes the upload for the current request, and does not retain it as a workspace document. Do not upload confidential material unless your organization has approved this workflow. A malformed, encrypted, image-only, or unusually complex PDF may return an incomplete or unable result instead of guessing.