PDF Accessibility Guides

Clear, practical guides to understanding and achieving PDF accessibility — from the PDF/UA standard to WCAG 2.1 AA and Section 508 compliance.

April 1, 20266 min read

How to Make a Scanned PDF Accessible with OCR

Why a scan is invisible to screen readers, and the OCR-then-tag workflow that fixes it.

March 26, 20265 min read

The 4.5:1 rule, the large-text exception, and why color must never be the only signal.

March 20, 20266 min read

Field labels, tab order, and instructions — what a fillable PDF needs to be usable by everyone.

March 14, 20265 min read

Why a single H1 and no skipped levels matters, and how screen reader users navigate by headings.

March 8, 20267 min read

Header cells, scope, and why layout tables should never be tagged as tables.

March 2, 20266 min read

Why multi-column layouts trip up screen readers, and how to correct the order content is read in.