Making PDFs Accessible: Tagged PDF and Screen Reader Guide

What Is an Accessible PDF

An accessible PDF (also called a Tagged PDF) contains structural information beyond visual appearance — headings, paragraphs, tables, lists, and image descriptions are marked up so screen readers and assistive technology can interpret them.

For websites, apps, and documents serving the public, accessibility is increasingly a legal requirement under India's Rights of Persons with Disabilities Act 2016 and internationally under WCAG 2.1.

Core Accessibility Requirements

Document tags: The PDF must have a tag structure (like HTML tags but for PDF). Tags define headings (H1-H6), paragraphs (P), lists (L/LI), tables (Table/TR/TD).

Alt text for images: Every image must have a description. Decorative images should be marked as artifacts to be ignored by screen readers.

Reading order: The logical reading order (what screen reader speaks first, second, third) must match the visual order.

Bookmarks: Long documents should have bookmarks corresponding to major sections for navigation.

Form labels: Interactive form fields must have descriptive labels.

Creating Accessible PDFs

From Microsoft Word: Apply proper heading styles (Heading 1, Heading 2) rather than just making text bigger and bold. Add alt text to images before exporting to PDF (Format Picture → Alt Text).

From Adobe InDesign: Use export tags, apply paragraph styles, add alt text to images.

Remediation of existing PDFs: Adobe Acrobat Pro's Accessibility Checker identifies and helps fix issues. This is a complex process for documents not originally created for accessibility.

Testing Accessibility

Acrobat's Accessibility Check: Run Full Check to identify issues.

Screen reader testing: NVDA (free) or JAWS on Windows, VoiceOver on Mac and iOS.

PAC 3 (PDF Accessibility Checker): Free tool, more thorough than Acrobat.