PDF/UA ValidatorNEW
Validate PDF documents against the ISO 14289-1 (PDF/UA) Universal Accessibility standards offline.
How PDF/UA Validation Works
Audit your document layout structure trees for universal accessibility in 3 simple steps.
Upload PDF Document
Select or drag your PDF into the local web sandbox. The validation scans page structures entirely in your browser memory.
Accessibility Compliance Audit
Our engine runs real-time structural tests verifying tag trees, natural language headers, font mappings, and contrast markers.
View & Download Report
Instantly view a visual map of tag outlines and bounding boxes, and export audit reports as JSON or CSV spreadsheets.
Verify PDF/UA Standard Compliance
Accessibility rules guarantee that assistive technologies (like screen readers) can parse and voice your documents correctly. CanvaTools runs this compliance check entirely client-side.
Logical Tagging Structure
Validates that the PDF contains a clean StructTreeRoot catalog tree representing headings, paragraphs, and lists.
Assistive Device Accessibility
Ensures security/encryption settings do not block text access for screen readers and text-to-speech tools.
Natural Language & Fonts
Checks that natural language headers (/Lang) are defined and fonts have proper /ToUnicode character mappings.
Frequently Asked Questions
Got questions about PDF/UA accessibility validation? We have compiled the answers for you.
Q.What is PDF/UA (ISO 14289) standard?
PDF/UA stands for PDF/Universal Accessibility. It is the international standard (ISO 14289-1) defining requirements for accessible PDF documents to ensure they work correctly with screen readers, braille displays, and other assistive technologies.
Q.How does client-side validation benefit my privacy?
Unlike other online validators, CanvaTools processes your files locally in your browser memory via JavaScript and WebAssembly. Your documents are never uploaded to any server, keeping confidential legal, financial, or business documents completely private.
Q.How can I fix a document that fails PDF/UA validation?
Common compliance failures include missing logical tagging structures or language codes. You can use our PDF Tagged Converter tool to automatically inject structural tag paths, set alternate text annotations, and configure viewer metadata.
Q.What specific rules does this accessibility check verify?
The validator checks for a logical structure tree (/StructTreeRoot), marked content flags (/MarkInfo), natural language specifications (/Lang), ToUnicode tables for custom fonts, alternative annotation content, and copy protection overrides.