Who Needs Accessible PDFs?
Over 1 billion people worldwide live with some form of disability. Many rely on assistive technology to consume digital content—and PDFs are among the most common formats they encounter. The main groups who benefit from accessible PDFs include:
What Makes a PDF Inaccessible?
Most PDFs look fine on screen but are completely unusable to a screen reader. The most common reasons:
Image-only (scanned) PDFs
A scanned document is just a picture. There's no machine-readable text at all—a screen reader hears nothing or reads "image." These are the worst accessibility failures.
No tag structure
PDFs need a "tag tree"—semantic markup that tells assistive technology what each element is (heading, paragraph, list item, table). Without tags, a screen reader gets a jumbled stream of text with no structure.
Wrong reading order
In multi-column layouts, the PDF's internal text order may not match the visual order. A screen reader follows the internal order, causing it to jump between columns mid-sentence.
No alternative text on images
Charts, diagrams, and photos convey information visually. Without alt text, blind users get nothing.
Unlabeled form fields
A screen reader user filling in a form needs each field to be labeled. An unlabeled field is impossible to fill in correctly.
Missing document language
Screen readers switch pronunciation based on language settings. If the document language isn't declared, text may be read with completely wrong phonetics.
What Does an Accessible PDF Have?
An accessible PDF has all of the following:
Real, selectable text (not scanned images)—OCR'd if necessary
A complete tag tree with correct semantic structure (headings, paragraphs, lists, tables)
Logical reading order that matches visual layout
Alternative text on all informative images; decorative images marked as artifacts
Document title and language set in metadata
Labeled form fields with correct tab order
Sufficient color contrast for text readability (4.5:1 ratio)
Descriptive hyperlink text (not "click here")
No security settings that block assistive technology access
The Standards That Define Accessible PDFs
Two main standards govern PDF accessibility:
WCAG 2.1 Level AA
The Web Content Accessibility Guidelines published by W3C. Level AA is the legal baseline referenced by the ADA, Section 508, EU Accessibility Act, and most national laws worldwide.
Learn more about WCAG →PDF/UA (ISO 14289)
The international standard specifically for PDF accessibility. More technically precise than WCAG—machine-testable and required by some procurement contracts and European regulations.
Learn more about PDF/UA →Why Is PDF Accessibility a Legal Requirement?
In the United States, the Americans with Disabilities Act (ADA) requires places of public accommodation and government entities to provide equal access to people with disabilities. Courts have consistently ruled this includes digital content, including PDFs.
Specific laws that require accessible PDFs include:
- ADA Title II – State and local governments
- ADA Title III – Private businesses open to the public
- Section 508 – Federal agencies and contractors
- Section 504 – Organizations receiving federal funding
- Section 1557 ACA – Healthcare providers
- EU Accessibility Act / EN 301 549 – European organizations
Non-compliance can result in DOJ investigations, OCR complaints, civil lawsuits, and costly remediation orders—all far more expensive than proactive accessibility work.