Making PDFs Accessible: A Guide for Screen Readers

A PDF can look completely normal — readable text, clear layout, no visible problems — and still be entirely inaccessible to someone using a screen reader. Understanding why this happens is the first step to fixing it, whether you're creating documents for public distribution or trying to make sense of a document someone sent you.

Why some PDFs fail with screen readers

Screen readers work by reading the underlying text data and structural tags embedded in a document — not by "looking" at the page the way a sighted person does. This causes two common failure modes:

• Scanned/image-based PDFs: If a PDF is a scanned page saved as an image, there is no text data at all — just pixels. A screen reader has nothing to read, and the page is completely silent to a visually impaired user, even though it looks like a normal readable document to everyone else.
• Untagged PDFs: Even text-based PDFs may lack the semantic tags (headings, reading order, alt text for images) that tell a screen reader how to navigate and interpret the structure. Without these tags, a screen reader may read content in the wrong order or skip meaningful structure entirely.

How to check if a PDF is accessible

1. Try selecting text in the PDF with your cursor. If you can click and drag to highlight individual words, the document has real text data (a good starting sign). If clicking just selects the whole page like an image, it's a scanned/image-based PDF with no text layer.
2. Check whether the document has a defined reading structure — most PDF viewers show a "Document Outline" or "Tags" panel if the file was properly tagged during creation.
3. If you have access to a screen reader (VoiceOver on Mac, Narrator on Windows, or a dedicated tool like NVDA or JAWS), the most reliable test is simply opening the document and listening.

Turning a scanned or image-based PDF into an accessible format

If a PDF has no real text layer, the practical fix is to convert it into a format that does. Use our PDF to Word converter to extract the readable text into an editable DOCX file, which most screen readers handle natively and reliably. Note that this only works well for text-based PDFs — genuinely scanned images require OCR (Optical Character Recognition) to identify characters within the image first, and results vary depending on scan quality.

If you only need the raw text content rather than formatting, our PDF to TXT converter extracts plain text, which is inherently screen-reader friendly since there's no layout or visual structure to interpret — just a straightforward reading order.

Best practices if you're creating documents for others

• Whenever possible, distribute the original text-based document (Word, Google Docs) alongside or instead of a scanned PDF.
• Use proper heading styles (Heading 1, Heading 2, etc.) in your source document rather than just making text bold and large — this preserves navigable structure when exported to PDF.
• Add descriptive alt text to any images that convey information, not just decorative graphics.
• Avoid using color alone to convey meaning (e.g. "items in red are overdue") since it won't be perceivable by screen reader users or people with color vision deficiencies.

Why this matters

Accessible documents aren't a niche concern — they affect millions of people who rely on assistive technology daily, and in many jurisdictions, accessibility is a legal requirement for public-facing and government documents. Taking a few extra minutes to check and fix accessibility issues makes your content usable by everyone, not just people who can see the page.