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CanvaTools Premium100% Free Assets Suite

PDF/UA ValidatorNEW

Validate PDF documents against the ISO 14289-1 (PDF/UA) Universal Accessibility standards offline.

Drag & drop files to validate

or click to browse from your device

How PDF/UA Validation Works

Audit your document layout structure trees for universal accessibility in 3 simple steps.

1

Upload PDF Document

Select or drag your PDF into the local web sandbox. The validation scans page structures entirely in your browser memory.

2

Accessibility Compliance Audit

Our engine runs real-time structural tests verifying tag trees, natural language headers, font mappings, and contrast markers.

3

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.

ISO 14289-1 Standard
Logical Tags Map100% Valid
✓ Accessibility Validated
PASSED

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.

How PDF/UA Validator Works

Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Accessibility Checker and Tagged Converter utilities.

Upload PDF

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Validate UA

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

ISO Standard

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

ISO Compliance Standards

Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:

Accessibility

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Tagged PDF

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Language Settings

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Reading Order

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Frequently Asked Questions About PDF/UA

Is this PDF/UA validator free?

Yes. Validate unlimited PDFs with no registration.

What is PDF/UA?

PDF/UA is the ISO standard for Universal Accessibility in PDF documents.

Does it check language settings?

Yes. Verifies natural language declarations for screen reader compatibility offline.

Do you store PDFs here?

No. All validation happens locally with complete privacy.