PDF Validation

Use Free PDFix Desktop Lite Accessibility Checker


Free PDF Validation

PDFix offers free PDF accessibility checker to help you ensure that your files are truly accessible. It provides a fast way to check PDF files for compliance with PDF/UA standards and makes it easy to spot all problems. What’s more, it finds accessibility issues, explains the problem, and offers suggestions on how to resolve each issue.

It’s powered by veraPDF validation open source engine, an industry-supported PDF/UA validator. In addition, PDFix provides conversion from Tagged PDF to HTML. It promptly helps you to display results and quickly check the structure and reading order.

PDF Accessibility Checker

PDFix Desktop Lite provides an automated way to check the accessibility of a PDF file.

  • Support for PDF/UA-1 (machine) validation leveraging the Matterhorn Protocol
  • Compatible with PAC, Adobe Acrobat
  • Quick navigation to errors in Tags, Content, or Annotations panes
  • Conversion to HTML for visually evaluating the logical structure and reading order
  • Well-organized summary of the results

About veraPDF

Version 1.18, the latest release of veraPDF, is the industry-supported open source PDF/A validator and a component of the Open Preservation Foundation’s reference toolset.

  • Support for PDF/UA-1 (machine checks)
  • PDF/UA-1 (machine) validation leveraging the Matterhorn Protocol
  • Industry Supported PDF/UA Validation
  • Open source implementation of PDF/UA validation
  • Ability to define further checks in order to enforce institutional policy
  • Available for MAC, Windows and Linux

Deriving HTML from PDF

Conversion of tagged PDF ISO 32000-2 documents to conforming HTML files. Implementation based on Deriving HTML from PDF specification.

  • Simplify accessibility of PDF through HTML
  • Reuse PDF content on mobile devices and HTML environments
  • Access information contained in PDF documents over the visual representation
  • Render authored PDFs into HTML
  • Derive PDF content into HTML for automated processing

Step-by-step Video Tutorial

How to check if a PDF is valid for Accessibility

PDFix Desktop Lite helps to validate your tagged PDF to ensure its compliance with the PDF accessibility standards. If you select the content error, PDFix highlights the error and navigates you to the page where it occurred. It also locates the error in the Content Panel.

Do not waste your time and have a look at our PDFix Desktop video tutorial, or visit our blog where we share a batch of great posts with really good PDF topics!

PDFix Desktop Tutorial: How to check if a PDF is valid for Accessibility. Click to load the Embed YouTube Player to play the video.

For Windows, Linux and macOS

PDFix Desktop Lite Icon in the gray color, which illustrates the "Lite" features.

Desktop Lite

PDFix Desktop Lite is a multiplatform PDF viewer with a built-in accessibility tool.

PDFix Desktop Pro Icon in blue color, which illustrates powerful PDF features built on the PDFix SDK

Desktop Pro

PDFix Desktop is a complex solution for PDF Accessibility, PDF Conversion and Data Extraction designed for professionals and businesses of all sizes.

PDFix SDK Icon in the green color


PDFix SDK is a cross-platform solution to Automatically Extract Structured Data from any PDF.

Have a question or are you missing something? Let us know and we’ll get back to you. Send us a message or select the time to talk to us, and we’ll get back to you.