PDF Accessibility Guide 2026: Creating PDFs Everyone Can Use

Accessible PDFs must meet several technical standards. Tagging is the foundation — a tagged PDF has a logical structure tree that describes document elements as headings (H1, H2, etc.), paragraphs, lists, tables, and figures. Screen readers use this structure tree to navigate and announce content meaningfully. Without tags, a screen reader can only read text in the order it appears in the PDF's raw data stream, which is often unrelated to the visual reading order. Every image must have alternative text (alt text) describing its content for users who cannot see it. Tables must have proper header cells so screen readers can announce which column and row header applies to each data cell. Color alone must never convey meaning — important information must also be indicated by text, shape, or pattern for users with color vision deficiency. Text contrast must meet WCAG 2.1 AA standards (4.5:1 ratio for normal text, 3:1 for large text).

1. 1Step 1: Create your document in a source application (Word or LibreOffice) using proper semantic structure. Use built-in Heading styles (Heading 1, Heading 2) rather than bold text to create headings — this ensures the structure exports correctly to PDF. Use genuine bulleted or numbered lists, not manually typed hyphens.
2. 2Step 2: Add alt text to all images in your source document before exporting. In Word: right-click image > Edit Alt Text. In LibreOffice: right-click image > Character (or Image Properties) > and add a description. Decorative images that carry no information should be marked as decorative rather than given meaningless alt text.
3. 3Step 3: Export to PDF with tags enabled. In Word: File > Save As PDF > Options > check 'Document structure tags for accessibility'. In LibreOffice: File > Export as PDF > check 'Export PDF tags'. This creates a tagged PDF with a proper structure tree inherited from your heading styles.
4. 4Step 4: Validate the accessibility of the exported PDF using free tools. PAC 3 (PDF Accessibility Checker, free Windows app) runs automated checks against PDF/UA standards. Adobe Acrobat Reader's accessibility checker (free) also provides basic checking. Review and address any issues reported before distributing the document.

Scanned PDFs are inherently inaccessible — they consist of images with no text layer, making them completely invisible to screen readers. The solution is OCR (Optical Character Recognition), which creates a searchable text layer from the scanned images. LazyPDF's OCR tool, powered by Tesseract.js, processes scanned PDFs and adds a text layer that screen readers can access. While OCR-based accessibility is not as clean as a properly tagged PDF created from a word processor, it dramatically improves the usability of scanned documents for assistive technology users. After OCR, the PDF's text becomes selectable, searchable, and readable by screen readers — moving from completely inaccessible to functionally accessible for most use cases. For official accessibility compliance (government, education, healthcare), OCR is a necessary first step but should be followed by proper tagging and structure review.

Tables and forms present special accessibility challenges. A properly accessible table has header cells marked as TH elements and data cells as TD, with correct scope attributes (row, column, both) that tell screen readers which headers apply to which data cells. Creating this correctly requires either using Word/LibreOffice with proper table structure (which exports fairly well) or post-processing with Adobe Acrobat Pro's accessibility tools. For PDF forms, accessible form fields must have meaningful labels that screen readers announce when the field receives focus — 'First Name:' not just an empty text box. Reading order — the sequence in which a screen reader reads page content — must match the visual reading order. Multi-column layouts often have incorrect reading order in exported PDFs and require manual remediation. For highly complex documents requiring full PDF/UA compliance, professional accessibility remediation services or Adobe Acrobat Pro are the practical options.

Visual accessibility extends beyond screen reader compatibility. Text must have sufficient contrast against its background — the WCAG 2.1 AA standard requires a contrast ratio of at least 4.5:1 for normal text (under 18pt) and 3:1 for large text (18pt+ or 14pt bold). Free contrast checking tools like WebAIM's Contrast Checker or the browser extension WAVE can evaluate color combinations before you create your PDF. Avoid using color alone to convey information: a red warning label should also include a warning symbol or text like '(IMPORTANT)'; a color-coded chart should also use different patterns or labels for each series. Font size matters significantly — body text should be at least 11–12pt for good legibility. Sans-serif fonts (Calibri, Arial, Roboto) are generally more readable on screen than decorative serif fonts for body content. Line spacing of at least 1.3x the font size improves readability for users with dyslexia and visual processing difficulties.