Why PDF Accessibility Matters
Accessible PDFs ensure that everyone, including people with visual impairments, motor disabilities, and cognitive challenges, can access your content. In a world where digital documents are the standard for communication, making PDFs accessible is not just a courtesy but often a legal and ethical obligation.
Accessibility matters for several important reasons:
- Legally required in many jurisdictions including ADA (Americans with Disabilities Act), Section 508 of the Rehabilitation Act, EN 301 549 in Europe, and the Accessibility for Ontarians with Disabilities Act (AODA) in Canada
- Good for SEO as search engines can index searchable text, improving your document's discoverability online
- Practical for everyone who needs to search, copy, translate, or reformat text from documents
- Inclusive by design ensuring no one is excluded from accessing important information
- Future-proof as accessibility standards continue to tighten globally
Organizations that fail to make their documents accessible risk legal action, loss of audience, and reputational damage. The good news is that making PDFs accessible has never been easier with the right tools.
Understanding PDF Accessibility Standards
Several standards govern PDF accessibility. Understanding which applies to your situation helps you prioritize the right steps.
WCAG (Web Content Accessibility Guidelines)
WCAG 2.1 Level AA is the most widely referenced standard. While designed for web content, its principles apply to PDFs shared online. Key requirements include perceivable content, operable navigation, understandable structure, and robust compatibility with assistive technologies.
PDF/UA (Universal Accessibility)
PDF/UA (ISO 14289) is the specific standard for accessible PDF documents. It requires tagged document structure, alternative text for images, proper reading order, and consistent navigation aids.
Section 508
US federal agencies must comply with Section 508, which requires all electronic documents, including PDFs, to be accessible to people with disabilities. Many state and local governments follow the same requirements.
The Problem with Scanned PDFs
Scanned documents are the single biggest barrier to PDF accessibility. They are essentially photographs of pages with no underlying text data, which means:
- Screen readers cannot read the content aloud to visually impaired users
- Users cannot search for words or phrases within the document
- Text cannot be copied for quoting, translation, or reformatting
- Search engines cannot index the content, making documents invisible online
- Automated translation tools cannot process the text
- Text-to-speech applications produce no output
Millions of legacy documents, historical records, and paper-first organizations still rely on scanned PDFs. Converting these to accessible formats is one of the most impactful accessibility improvements you can make.
Making Scanned PDFs Accessible with OCR
OCR (Optical Character Recognition) is the technology that converts images of text into actual searchable, selectable text. It is the essential first step for any scanned document.
Step 1: Upload Your Scanned PDF
Open the [OCR PDF](/ocr-pdf) tool and upload your scanned document. The tool accepts multi-page documents and processes each page individually.
Step 2: Run OCR
The tool analyzes each page, identifying individual characters, words, and paragraphs in the scanned images. Modern OCR engines achieve over 98% accuracy on clearly printed text at 300 DPI or higher.
Step 3: Download the Searchable PDF
The result is a PDF that looks identical to the original but now contains a hidden text layer underneath the scanned image. Users can select, copy, and search the text. Screen readers can now read the content aloud.
Tips for Best OCR Results
- Scan at 300 DPI or higher for optimal character recognition
- Ensure pages are straight and not skewed during scanning
- Use good lighting to avoid shadows and dark areas
- Clean the scanner glass to prevent spots and streaks
- For poor-quality originals, adjust brightness and contrast before scanning
Beyond OCR: Building a Complete Accessibility Workflow
OCR is the foundation, but truly accessible PDFs require additional steps. Here is a comprehensive approach to document accessibility.
Extract Text for Alternative Formats
After running OCR, use [Extract Text](/extract-text) to create a plain-text version of the document. For a detailed walkthrough, see our guide on [how to extract text from any PDF](/blog/extract-text-from-pdf). This is useful for:
- Creating HTML alternatives that are inherently more accessible than PDFs
- Providing text-only versions optimized for screen readers and braille displays
- Making content available in simpler formats for users with cognitive disabilities
- Feeding content into translation services for multilingual access
Add Page Numbers for Navigation
Documents without page numbers are difficult to navigate, especially for screen reader users who cannot visually scan the page. Use [Add Page Numbers](/add-page-numbers) so readers and assistive technology users can reference specific pages when discussing or citing the document. See our [guide to adding page numbers](/blog/add-page-numbers-to-pdf) for detailed instructions.
Ensure Proper Page Order
If pages are out of order due to scanning errors or file assembly mistakes, readers get confused and lose context. Use [Reorder Pages](/reorder-pages) to fix the sequence before publishing.
Flatten Interactive Elements
Interactive forms can cause issues with certain assistive technologies. After forms are completed, [flatten the PDF](/flatten-pdf) to create a static, universally readable version. Learn more about this process in our [guide to flattening PDFs](/blog/how-to-flatten-pdf).