Making PDFs Accessible for Everyone: A Practical Guide

Over one billion people worldwide live with some form of disability, and many of them rely on assistive technologies to access digital content. PDFs are one of the most widely shared document formats, yet most PDFs are created without accessibility in mind. An inaccessible PDF is effectively invisible to screen reader users, people with low vision, and those with cognitive disabilities. This guide walks you through the essential steps to make your PDFs accessible to everyone.

Why PDF Accessibility Matters

PDF accessibility is not just a matter of good practice — in many jurisdictions, it is a legal requirement. The Americans with Disabilities Act (ADA), the European Accessibility Act, and Section 508 of the Rehabilitation Act all mandate that digital documents be accessible. Beyond compliance, accessible PDFs reach a wider audience, improve SEO through better document structure, and demonstrate a commitment to inclusion that strengthens your brand.

• Legal compliance: Many countries require public-facing documents to meet accessibility standards like WCAG 2.1 AA.
• Wider reach: Accessible documents serve users with visual, motor, cognitive, and hearing impairments.
• Better SEO: Properly structured documents with headings, alt text, and metadata are better indexed by search engines.
• Professional quality: Accessible documents are generally better organized and easier to navigate for all users.

Understanding Screen Readers and PDFs

Screen readers like JAWS, NVDA, and VoiceOver convert digital text into speech or braille output. For a screen reader to interpret a PDF correctly, the document must contain a logical reading order, proper heading structure, and tagged content. A PDF that is just a flat image of text — such as a scanned document — is completely unreadable to screen readers unless Optical Character Recognition (OCR) has been applied to convert the image into actual text.

Document Structure: The Foundation of Accessibility

A well-structured PDF uses tags to define headings, paragraphs, lists, tables, and other content elements. These tags create a logical hierarchy that screen readers follow to navigate the document. Without proper tagging, a screen reader reads the PDF as a continuous stream of text with no structure, making it nearly impossible for users to find specific sections or understand the document organization.

• Use heading tags (H1 through H6) to create a clear document hierarchy. Never skip heading levels.
• Mark up lists as actual list elements, not just lines of text with bullet characters.
• Tag tables with proper header cells and row/column structure so screen readers can announce cell positions.
• Define the reading order explicitly — it should follow the logical flow of the content, not the visual layout.
• Use paragraph tags for body text to separate it from headings, lists, and other elements.

Alt Text for Images and Graphics

Every meaningful image in a PDF needs alternative text that describes its content and purpose. Alt text should be concise but descriptive — it should convey the same information that a sighted user would get from looking at the image. Decorative images that add no informational value should be marked as artifacts so screen readers skip them entirely. Charts and graphs need especially detailed alt text or an accompanying data table that presents the same information in text form.

Accessibility Standards: PDF/UA and WCAG

Two key standards govern PDF accessibility. PDF/UA (Universal Accessibility, or ISO 14289) is the international standard specifically for accessible PDFs. It defines technical requirements for tagged content, reading order, alt text, and more. WCAG (Web Content Accessibility Guidelines) provides broader accessibility guidelines that also apply to PDFs shared digitally. Meeting WCAG 2.1 Level AA is the most commonly required standard for compliance.

• PDF/UA (ISO 14289): Specific to PDF documents. Requires proper tagging, reading order, alt text, document title, and language specification.
• WCAG 2.1 Level AA: The most widely referenced accessibility standard. Covers perceivability, operability, understandability, and robustness.
• Section 508: US federal standard that references WCAG 2.0 Level AA for electronic documents.
• European Accessibility Act: EU directive requiring accessible digital products and services, including documents.

Practical Steps to Create Accessible PDFs

The best approach is to build accessibility into your documents from the start, rather than trying to remediate inaccessible PDFs after the fact. If you are creating PDFs from Word, use built-in heading styles, add alt text to images, and use the accessibility checker before exporting. If you are merging multiple PDFs into a single document, ensure each source PDF is properly tagged first.

• Start with accessible source documents: Use heading styles, alt text, and proper structure in Word, InDesign, or your authoring tool.
• Set the document title and language in the PDF properties — screen readers use these to announce the document correctly.
• Run the built-in accessibility checker in standard PDF readers or your PDF editor to identify and fix issues.
• Test with an actual screen reader (NVDA is free) to experience how a user with disabilities will interact with your document.
• When merging PDFs with FyleTools at /pdf/merge, ensure all source documents are tagged and structured before combining them.

Testing and Validation Tools

Automated tools catch many accessibility issues, but manual testing is essential for verifying reading order, alt text quality, and overall usability. other PDF tools includes a comprehensive accessibility checker. The free PAC (PDF Accessibility Checker) tool validates against PDF/UA standards. For the most reliable testing, have someone use a screen reader to navigate the document from start to finish.