PDF Accessibility Guide — Making PDFs Readable by Everyone
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What Is an Accessible PDF?
An accessible PDF is one that people with disabilities — particularly those who are blind or have low vision and use screen readers — can read and navigate. Accessibility features include proper reading order, alternative text for images, tagged headings for navigation, and text that can be selected and read aloud.
Why It Matters
In many countries, publicly facing documents published by government agencies, educational institutions, and large organisations must meet accessibility standards (WCAG 2.1, PDF/UA). Beyond compliance, accessible PDFs simply reach more people — including those using mobile assistive technology or older devices with limited rendering capabilities.
Key Accessibility Features in PDFs
- Tags — A tagged PDF has a logical structure tree (headings, paragraphs, lists, tables) that screen readers use to navigate. Untagged PDFs are essentially unreadable by screen reader software.
- Alt text for images — Every meaningful image should have a text description. Decorative images should be marked as artefacts so screen readers skip them.
- Reading order — Multi-column layouts can confuse screen readers if the reading order isn't explicitly set. The visual order and the logical reading order must match.
- Document language — Setting the document language ensures screen readers pronounce words correctly.
- Form field labels — Every form field needs a visible label or tooltip so screen reader users know what to fill in.
How to Check PDF Accessibility
Adobe Acrobat Pro includes an Accessibility Checker (Tools → Accessibility → Full Check) that flags missing tags, missing alt text, and reading order problems. The free PAC 3 tool (PDF Accessibility Checker) also provides detailed PDF/UA compliance reports.
Creating Accessible PDFs From the Start
The easiest way to create an accessible PDF is to start from an accessible source document. In Microsoft Word, use proper heading styles (Heading 1, Heading 2), add alt text to images (right-click → Edit Alt Text), and export using Save As → PDF with "Document structure tags for accessibility" checked. This produces a tagged PDF without needing Acrobat Pro.
Scanned PDFs and Accessibility
Scanned PDFs are image-only and inherently inaccessible — there is no text for a screen reader to read. Run OCR to add a text layer, then open in Acrobat to add tags and alt text. This is more work but is the only path to making a scanned document accessible.