CommonLook PDF Validator

A free, robust Adobe Acrobat plug-in designed for testing and verifying PDF accessibility.

Verify PDF Accessibility.

Are You Sure Your Document is Accessible?
You Are Now.

Whatever authoring tool you use, chances are the PDFs that it generates are not fully accessible. Worse yet, without a tool to validate the document, you most likely wouldn’t know what errors are present. That all changes today. Our free PDF Validator combines our proven PDF technology and feature set into the perfect tool for testing and validating your documents.

Knowledge is Power.

PDF Verification. Fast and Right.

PDF Validator provides users with a certification report for each tested document. As a result, communications and compliance specialists can rest assured that their PDFs are compliant with accessibility standards.

  • Verify and validate documents against Section 508, WCAG AA, PDF/UA, and HHS.

  • Generate a recognized compliance report for each document.

  • Customize checkpoints to each standard to meet the organization’s accessibility needs.

Your Best Free Solution.

PDF Validator Features

Document Properties

  • View and Verify appropriate Metadata, including Title, Subject, Author, Keywords, Language, and Country.
  • Verify that the document will display the Title (not the file name).
  • View and Verify accurate Bookmarks.
  • Check that fonts are correctly embedded in the document.
  • Test that characters in text objects are mapped to Unicode.

Lists and Links

  • Test for proper assembly of List and Link tags.
  • Test for, and allow the user to verify link tag Alternative text.
  • Test for, and enable the user to verify link annotation Contents (PDF/UA).
  • Test for “broken” links.


  • Test for proper assembly of Form tags.
  • Test for Tooltips.
  • Allow the user to verify the accuracy of Tooltips.

Proper Tagging

  • View the Tags tree to verify proper tagging and to verify logical reading order.
  • Verify proper tag nesting.
  • Verify the correct use of heading tags.
  • Selecting a tag in the Tags tree highlights the content in the PDF.
  • Highlighting content in the PDF automatically selects the tag.
  • Tag Properties panel conveniently displays the properties of any tag (alternative text, table summary, tooltip, etc.).
  • Verify and Pass the Alternative text on any tag.
  • Selecting an error in the verification results shows the element in the PDF.
  • Verify proper role mapping for custom tags.
  • Easily view untagged content.
  • Test for the presence of empty tags.
  • Check for empty tags that contain Alternative text.


  • Test for table regularity.
  • Test for adequate assembly of Table tags.
  • Test for existence of Table Summaries.
  • Allow the user to verify the accuracy of Table Summaries.

PDF Validator Workstation Requirements

Before installing the CommonLook (CL) PDF Validator, please ensure that the workstation meets the following minimal requirements.

  • Windows 8 or higher.
  • Adobe Acrobat: Standard or Professional (we recommend Pro DC), Acrobat X (10) or higher.
  • Please be sure to follow the installation instructions carefully.
  • In addition, we recommend you begin using CL PDF Validator with the instructions in the User’s Guide.

FREE PDF Validator.

Here, FREE doesn’t mean less functionality.

Your PDFs must be compliant, and we are here to help! Fill out the form to download our FREE PDF Validator tool. The tool will help you identify any accessibility issues your document has so you can fix them.

CL Free PDF Validator

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