Best Practices for Creating Accessible PDFs

Why Accessibility Matters

Over one billion people worldwide live with some form of disability. Creating accessible PDFs isn't just a legal requirement in many jurisdictions — it's a fundamental aspect of inclusive communication.

Key Accessibility Features

Document Structure (Tags)

Tagged PDFs include a logical structure tree that tells assistive technology about headings, paragraphs, lists, tables, and reading order. Without tags, a screen reader has to guess the reading order from the visual layout.

Alternative Text

Every image in an accessible PDF needs alternative text that describes what the image conveys. Decorative images should be marked as artifacts so screen readers skip them entirely.

Reading Order

The logical reading order should match the visual layout. In multi-column documents, ensure the tag structure follows the correct column order rather than reading straight across the page.

Color Contrast

Text must have sufficient contrast against its background. WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text.

Testing Accessibility

Use these methods to verify your PDF is accessible:

1. Adobe Acrobat Accessibility Checker: Built-in tool that identifies common issues.
2. PAC (PDF Accessibility Checker): Free tool that tests against PDF/UA standard.
3. Screen reader testing: Test with NVDA (Windows) or VoiceOver (macOS) to experience the document as a screen reader user would.
4. Keyboard navigation: Ensure all interactive elements (links, form fields) are reachable and operable with keyboard alone.