Make Every PDFAccessible

Tag and remediate your PDFs to WCAG 2.1 AA and PDF/UA — verified with veraPDF — while keeping your original design intact. Need HTML too? Get a semantic, accessible HTML version of any document.

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6,000+

Pages made accessible

< 20s

Per page processing

PDF/UA

veraPDF verified

10 pages

Free trial, no card required

Built for Complex Documents

Textbooks, lecture notes, research papers, exam materials — we handle the content types that trip up other converters.

Smart AI Processing

Intelligent routing sends each page to the optimal conversion method — fast processing for simple content, advanced analysis for complex layouts.

Equation Recognition

Printed and handwritten equations are converted to native MathML that screen readers can speak aloud.

Intelligent Alt Text

AI analyzes images and generates descriptive, contextual alt text. Diagrams, charts, and photos — all described accurately.

Table Structure

Complex tables with merged cells and headers are rebuilt as properly tagged tables, with header associations screen readers can follow.

WCAG & PDF/UA Validation

Every output is validated against WCAG 2.1 AA, and PDFs against PDF/UA with veraPDF. Common issues are auto-fixed, and you get a downloadable report.

Hosted Shareable URLs

Get a permanent link for every converted document. Share with colleagues, embed in your LMS, or replace your PDF links — we host it for free.

Tools to Cross the Last Mile

Automated conversion gets you most of the way. These are the tools that close the gap between “converted” and “confidently compliant.”

The full audit

Every page is checked against WCAG 2.1 AA with 45+ custom rules, headless-browser testing, and specialized accessibility checks. You get a clear, downloadable report of exactly where the document stands.

Guided remediation

Our fix loop repairs 20+ common issue types automatically — headings, landmarks, contrast, alt text, ARIA — and re-audits after each pass to confirm no regressions. A guided workspace walks you through anything automation shouldn’t decide on its own.

veraPDF conformance

Every accessible PDF is validated against PDF/UA with veraPDF across multiple passes. Conformance is measured and reported, not assumed — so you know precisely which clauses pass and which still need attention.

An honest account — you stay in control

We don’t certify your compliance or perform human review, and we won’t claim a document is “accessible” on your behalf. What we give you is a precise, verifiable record of what we changed and which gaps automated testing can’t close — so you and your team make the final call, with something real to act on.

Two Steps to Accessibility

1

Drag & Drop Your PDF

Drop your file or select it from your computer. PDFs up to 50 MB with any number of pages.

2

Share or Download

Download your accessible PDF, or get a hosted shareable URL for an accessible HTML version. Preview for free, then purchase credits to unlock the final version.

What We Test

Every document is validated against WCAG 2.1 Level AA using 45+ custom rules, headless browser auditing, and specialized accessibility checks — and PDFs against PDF/UA with veraPDF. Issues we can fix are fixed automatically; the ones automated testing can’t settle, we report honestly.

Document Structure

  • Title, language declaration, viewport meta
  • Valid lang attribute value (ISO language code)
  • Language of parts (lang on foreign-language passages)
  • Sequential heading hierarchy (h1 → h2 → h3)
  • Empty headings detected and flagged
  • Landmark regions (main, nav, header, footer)
  • Skip navigation link
  • Unique element IDs

Images & Alt Text

  • AI-generated descriptive alt text for every image
  • Alt text quality — no generic placeholders
  • Decorative images marked as presentational
  • SVG and role="img" elements labeled
  • Images of text detected (SC 1.4.5)

Tables & Lists

  • Header cells with scope attributes
  • Headers must have associated data cells
  • Fake caption rows converted to <caption>
  • Empty table headers detected
  • Proper list structure (ul/ol with li only)
  • Definition list structure (dl/dt/dd)
  • Orphan dt/dd elements outside dl detected
  • Layout tables marked role="presentation"

Color & Visual

  • Color contrast — 4.5:1 normal, 3:1 large (AA)
  • Content readable at 200% zoom (browser test)
  • WCAG 1.4.12 text spacing overrides (browser test)

Keyboard & Navigation

  • Focus order matches visual reading order
  • No positive tabindex disrupting flow
  • Interactive elements not removed from tab order
  • Links and buttons have discernible text

Math & Equations

  • Equations converted to native MathML
  • Math elements have alt text / aria-labels
  • Equations use screen-reader-compatible markup

ARIA & Semantics

  • Valid WAI-ARIA roles
  • Required ARIA attributes present on roles
  • ARIA attribute values are valid
  • ARIA attributes match element roles
  • Nested interactive elements detected
  • Bold paragraphs used as headings detected
  • Invalid HTML nesting detected (block inside inline)

Auto-Remediation

When the audit finds violations, our fix loop automatically repairs 20+ common issue types — missing landmarks, heading order, contrast, ARIA attributes, and more. The document is re-audited after each fix to confirm no regressions. Up to 3 iterations run before finalizing.

Limitations of Automated Testing

Color as sole information carrier

Detecting whether color is the only means of conveying information (e.g. in charts or status indicators) requires semantic analysis beyond current automated capabilities. Contrast ratios are verified mathematically.

Screen reader pronunciation

Automated tools verify structure, but cannot hear what a screen reader actually speaks. We ensure correct semantic markup so screen readers have the right information.

Subjective reading order

We verify focus order and heading hierarchy programmatically. Complex multi-column layouts may need human judgment for optimal reading flow.

Cognitive accessibility

Language complexity, reading level, and cognitive load are not measured. Our output preserves the source document's language.

Complex interaction patterns

We test keyboard tab order and focus management. Multi-key shortcuts or custom widget interactions in source content are beyond automated testing.

Color blindness simulations

We enforce contrast ratios mathematically. Simulating deuteranopia, protanopia, or other conditions requires specialized tools.

See a real report

Every conversion ships with this

PDF/UA-1 conformance measured with veraPDF, a full WCAG 2.1 A/AA rule pass, the auto-fix loop that closed each violation, and an honest list of what still needs a human. No certification, no rubber stamp — a record you can act on.

View the full sample report
PDF/UA-1 (veraPDF)
Pass
WCAG rules passed
46 / 47
Auto-fixed
1
Needs review
5

Frequently Asked Questions

We automatically do an AI-driven visual comparison of the rendered HTML output and the PDF input. If the result does not meet our standards for accuracy, we attempt to fix it. If the output cannot be fixed, we will abort the conversion and notify the user. It is possible to provide PDF input that cannot be reliably processed, but it is rare. Every conversion has an unconditional 30 day money-back guarantee. Click the feedback button at the bottom of any page and just tell us what happened.
We list on the website and on every conversion exactly which WCAG requirements we test against. Every document has a 30 day no questions asked money back guarantee.
We detect complex layouts visually and compare the output with the input - but our goal is accessibility. We have to sacrifice layout complexity for accessibility, we will.
Scanned PDF are a special case. We detect a PDF that was created on a scanner and only contains pictures of documents rather than document content and processes that PDF in a completely different workflow. Any text on each page is extracted and any images are analyzed and an appropriate alt-text tag is created. Then the images are recreated in the HTML with the alt tag and any recognized text.
Yes. Extracting and formatting equations from PDFs is a challenge. We automatically detect equations in the source PDF and use best-of-breed equation recognition solutions to extract the equation, format it properly and insert it into the HTML.
Every document is validated against WCAG 2.1 AA standards. We auto-fix common issues and flag anything requiring manual review. You can download a compliance report for each conversion.
The Enterprise plan includes API access and webhooks.
We produce WCAG-compliant HTML. Every conversion includes an analysis of what the document was tested against and any warnings or failures.
We use a combination of cloud-based and on-site servers with automatic failover to multiple providers. We distribute AI calls to at least three different providers to process tasks in parallel and isolate the system from failures in any one provider. It is very reliable.
The generated HTML can automatically be stored on any S3-compatible storage system. Self-hosted storage is available on Department and Enterprise plans only.
View all 25 frequently asked questions

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