How to Create Accessible PDF Documents

Creating Accessible PDFs

Accessible PDFs ensure that people with visual, motor, and cognitive disabilities can navigate and understand your documents using assistive technologies like screen readers.

Document Structure

Tagged PDFs contain a logical structure tree that maps visual elements to semantic roles — headings, paragraphs, lists, tables, and figures. Without tags, a screen reader reads the raw text stream in physical order, which may not match the visual reading order, especially in multi-column layouts. Always export from structured source documents (Word, InDesign) rather than scanning or printing to PDF.

Alt Text and Descriptions

Every non-decorative image requires alternative text describing its content and purpose. Complex figures (charts, diagrams, infographics) need both a short alt text and a longer description. Decorative images should be marked as artifacts so screen readers skip them entirely.

Reading Order

The reading order in a tagged PDF may differ from the visual layout, especially in documents with sidebars, footnotes, or multi-column text. Verify the reading order using a PDF accessibility checker — it should flow logically from beginning to end, with sidebar content appearing at the point where it's referenced in the main text.

Form Accessibility

PDF forms must have labeled fields (not just visual labels near the fields), proper tab order, and clear error messages. Checkbox and radio button groups need group labels. Date fields should accept typed input, not just date pickers. Test forms with keyboard-only navigation and a screen reader.

Color and Contrast

Information conveyed by color alone is inaccessible to colorblind users. Use patterns, labels, or shapes in addition to color coding. Text must meet WCAG contrast requirements: 4.5:1 for normal text, 3:1 for large text. These requirements apply within the PDF, not just on the web page that links to it.