How to Make a Scanned PDF Accessible Using Adobe Acrobat

Scanned PDF documents, often created from printed books or paper materials, are not inherently accessible. These image-based files lack embedded text and structure, making them unreadable by screen readers and inaccessible to individuals who rely on assistive technologies. This guide outlines how to convert a scanned PDF into an accessible, readable document using only Adobe Acrobat’s built-in features.

Video Guide

1. Identify the Accessibility Challenge

Scanned PDFs appear as images rather than readable text. They contain no tags, no semantic structure, and no searchable or selectable text. To make these documents accessible, the first task is to convert the images into actual text using Optical Character Recognition (OCR).

2. Apply OCR to Recognize Text

Open Adobe Acrobat Pro and navigate to the “Scan & OCR” tool. Select “Recognize Text in This File” and choose “All Pages.” Adjust the settings to optimize recognition:

• Set the document language to English.
• Choose output as editable text and images.
• Set the resolution to 600 DPI.

Start the OCR process to convert the image-based content into text that screen readers can interpret.

3. Auto-Tag the Document for Structure

After completing OCR, use the “Prepare for Accessibility” tool and select “Auto-tag Document.” Acrobat will automatically assign structural tags such as headings (H1, H2) and paragraph elements (P). These tags create a foundation for screen readers to navigate and interpret the content.

4. Clean Up Incorrect Tags

Auto-tagging often introduces errors, especially in complex layouts or where visual elements like drop caps confuse OCR. Address these issues by:

• Identifying non-textual or irrelevant elements.
• Changing unnecessary figure or container tags into artifacts so that screen readers ignore them.
• Deleting incorrectly placed tags.

5. Correct Text Manually Using Properties

When OCR misidentifies characters or tags, use the Properties panel to apply corrections. Copy the correct paragraph text, right-click the tag, and open “Properties.” Paste the accurate text into the “Actual Text” field. This step ensures that screen readers interpret the content accurately even if the visual representation remains flawed.

6. Remove Unnecessary Containers and Artifacts

Scanned documents often include unintended containers due to page skew or image bleed. Identify these extraneous elements and:

• Select them using the Tags pane.
• Convert them to artifacts.
• Delete any remaining blank or irrelevant tags.

This process eliminates distractions and streamlines the document’s logical reading order.

7. Verify Accessibility with Adobe’s Checker

After tagging and cleanup, run Adobe Acrobat’s built-in Accessibility Checker. Check for common issues such as:

• Character encoding problems.
• Unrecognized structure.
• Missing alternate text (in documents that contain images).

Although minor issues like character encoding may appear, they typically do not hinder screen reader functionality.

8. Test with a Screen Reader

To ensure the document functions as intended, test it with a screen reader. Confirm that headings, paragraphs, and reading order flow logically and without interruption. This testing phase validates that users with assistive technologies will experience the document correctly.

9. Optional Validation with PAC 2024 Tool

For deeper validation, consider using the PDF Accessibility Checker (PAC 2024). This tool checks compliance with PDF/UA standards and identifies additional issues that Adobe’s checker may miss.

10. Final Review and Best Practices

After making corrections and validating the document’s accessibility, save the final version. Continue improving accessibility by maintaining clean structure, consistent formatting, and accurate tagging in all future documents.

Conclusion

Making a scanned PDF accessible requires a combination of OCR, auto-tagging, manual correction, and validation. Adobe Acrobat provides all necessary tools to accomplish this without third-party software. By applying these techniques, anyone can transform a static, image-based document into a fully accessible PDF that meets digital inclusion standards.

Let me be your champion for inclusion. I offer tailored solutions (and self-paced courses!) to ensure your documents meet and exceed compliance expectations. For more detailed insights, tutorials, and in-depth discussions on accessibility and related topics, don’t forget to check out my YouTube channel: The Accessibility Guy on YouTube. Subscribe for regular updates!