PDF Accessibility (PDF/UA): Creating Inclusive Documents

Accessibility is an essential aspect of digital document distribution. PDF/UA (Universal Accessibility, officially ISO 14289) defines the rules for compiling PDF files that can be read accurately by assistive technology, such as screen readers for visually impaired users.

Accessible PDFs rely on structural tags. A tagged PDF organizes flat layout items into a semantic hierarchy, similar to HTML. Heading levels (H1, H2, H3) specify content hierarchy, paragraph tags grouping text boxes together, and table tags defining columns and rows.

Equally important is image alternative text. Crawlers and screen readers cannot read pixels; they rely on ALT tags to describe graphic content. LovethePDF supports generating and preserving accessibility tag trees during compression, ensuring documents remain inclusive, legal, and crawl-friendly.