Making PDFs accessible is no longer optional. Whether you are publishing reports, invoices, forms, or marketing collateral, inaccessible PDFs can block screen-reader users, trigger legal risk, and hurt your brand. The good news is that a growing range of PDF accessibility checkers can spot problems before your documents go live.
In this article, we test and compare five popular tools: Adobe Acrobat Accessibility Check, PAC 2024, axesPDF, CommonLook PDF Validator, and the EasyAccessPDF free checker. We look at what each one detects, how easy it is to use, and which workflow it suits best.
What we look for in a PDF accessibility checker
A useful checker should go beyond a simple pass-or-fail badge. We evaluated each tool on the following criteria:
- Detection depth: Does it catch missing tags, incorrect reading order, missing alt text, low color contrast, and form-field labels?
- Ease of use: Is it a desktop install, browser upload, or plug-in? How quickly can a non-expert get results?
- Remediation support: Does it only report issues, or does it help you fix them?
- Standard compliance: Does it reference PDF/UA, WCAG 2.1, or Section 508?
- Cost: Is there a free tier or trial?
1. Adobe Acrobat Accessibility Check
Adobe Acrobat Pro includes a built-in accessibility checker under Prepare a PDF for accessibility. It scans for tagged content, reading order, alt text, table headers, form fields, color contrast, and more. Results are grouped into errors, warnings, and manual checks.
What it detects best: Comprehensive coverage of PDF/UA and WCAG issues, including complex tables and form structures.
Ease of use: Moderate. The interface is familiar to Acrobat users, but fixing issues often requires manual editing in the Tags panel.
Best for: Teams already paying for Adobe Creative Cloud or Acrobat Pro who want an all-in-one authoring and remediation environment.
Cost: Paid subscription.
2. PAC 2024
PAC (PDF Accessibility Checker) 2024 is a free Windows application developed by the PDF Association's PDF/UA Competence Center. It is widely used in Europe and by public-sector organizations because it tests against ISO 14289 (PDF/UA) in detail.
What it detects best: Deep PDF/UA validation, including structure tree issues, role mapping, and a built-in screen-reader preview.
Ease of use: Moderate. The reports are technical, but the screen-reader simulation helps users understand real-world impact.
Best for: Government, education, and healthcare organizations that need PDF/UA compliance reports.
Cost: Free.
3. axesPDF
axesPDF offers automated PDF accessibility checking and remediation aimed at enterprise workflows. It integrates with Microsoft Office and common PDF authoring tools, and it can batch-process large volumes of documents.
What it detects best: Automation-friendly issues such as missing tags, heading hierarchy, list structure, and link annotations.
Ease of use: Good for power users; setup is heavier than a simple upload tool.
Best for: Large organizations that need scalable, repeatable accessibility checks across thousands of PDFs.
Cost: Paid, with enterprise licensing.
4. CommonLook PDF Validator
CommonLook PDF Validator checks documents against PDF/UA and WCAG 2.1 criteria. It produces detailed compliance reports and is often chosen by legal, financial, and government teams that need defensible documentation.
What it detects best: Strict standards alignment, semantic structure, and remediation guidance tied to specific checkpoints.
Ease of use: Steeper learning curve, but the reporting is excellent for audits.
Best for: High-stakes documents where compliance must be provable, such as contracts, statements, and public filings.
Cost: Paid.
5. EasyAccessPDF Free Checker
EasyAccessPDF's free online checker is the fastest way to scan a PDF for common accessibility barriers. Upload a file, and the tool checks tags, alt text, reading order hints, color contrast, and form labels in seconds.
What it detects best: The most common failures that block screen readers and keyboard navigation, presented in plain language.
Ease of use: Very high. No installation, no account, and results are easy to act on.
Best for: Small teams, marketers, and content managers who need a quick health check before publishing or sending a document.
Cost: Free.
Quick comparison
| Tool | Price | Best for | Standards |
|---|---|---|---|
| Adobe Acrobat | Paid | All-in-one authoring and repair | PDF/UA, WCAG |
| PAC 2024 | Free | Detailed PDF/UA compliance | PDF/UA |
| axesPDF | Paid | Enterprise batch processing | PDF/UA, WCAG |
| CommonLook | Paid | Audit-ready legal/government docs | PDF/UA, WCAG |
| EasyAccessPDF | Free | Fast online checks | WCAG, PDF/UA basics |
Which PDF accessibility checker should you choose?
Choose Adobe Acrobat if you already live in the Adobe ecosystem and want integrated authoring plus remediation. Choose PAC 2024 if you need a free, rigorous PDF/UA report for public-sector requirements. Choose axesPDF for automated pipelines at scale. Choose CommonLook when compliance must be documented and defensible.
If you simply want a fast, no-commitment way to see whether your PDF is accessible, start with the EasyAccessPDF free checker. It catches the most common barriers and tells you exactly what to fix before you invest in heavier tooling.
Accessibility is a process, not a one-time scan. Run a checker early, fix the highest-impact issues, and test again. Your users, and your legal team, will thank you.