How to Make Your PDFs Accessible

Creating an accessible PDF ensures that everyone can read your documents, including people using screen readers and other assistive technologies. Accessibility is not just good practice — it is often legally required.

Why PDF Accessibility Matters

• Legal requirements: Section 508 (US), WCAG 2.1, and the European Accessibility Act require accessible digital documents in many contexts.
• Larger audience: Approximately 15% of the global population lives with some form of disability.
• Better for everyone: Accessible documents have clearer structure, which benefits all readers.

Key Principles of Accessible PDFs

1. Proper Document Structure

Use heading levels (H1, H2, H3) to create a logical hierarchy. Screen readers use headings for navigation — without them, users must listen to the entire document sequentially.

2. Alternative Text for Images

Every image should have descriptive alt text that conveys the same information as the image. Decorative images should be marked as artifacts so screen readers skip them.

3. Reading Order

Set a logical reading order that matches the visual layout. Multi-column documents need explicit reading order so screen readers process content in the correct sequence.

4. Tagged PDF Structure

PDF tags define the role of each content element (paragraph, heading, table, list). Tagged PDFs allow screen readers to navigate and interpret content correctly.

5. 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.

6. Descriptive Link Text

Avoid "click here" links. Instead, use descriptive text: "Read the full accessibility guidelines" tells the user where the link goes.

Creating Accessible PDFs

The best approach is to create accessibility in the source document (Word, InDesign) before exporting to PDF:

1. Use built-in heading styles in Word instead of manually formatted bold text.
2. Add alt text to all images in the source document.
3. Use real tables for tabular data (not images of tables).
4. Set the document language in document properties.
5. Export as tagged PDF from your authoring tool.

Testing Accessibility

After creating your PDF, test it:

• Use Adobe Acrobat's built-in accessibility checker.
• Test with a screen reader (NVDA for Windows, VoiceOver for Mac).
• Check color contrast with online contrast checkers.

How PDF Shuttle Helps

While PDF Shuttle does not add accessibility tags, our tools help with the workflow:

• PDF Converter converts PDFs to Word for editing, where you can add accessibility features.
• Compress PDF reduces file sizes without affecting tagged structure.
• AI PDF Summarizer creates text summaries that complement complex visual documents.