AChecker review
A free, open-source checker for HTML, PDF, and human-reviewed accessibility findings.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
AChecker is a web accessibility checker for people evaluating HTML pages and documents against selected accessibility guidelines. It accepts a page URL, an uploaded HTML file, or pasted HTML source, then generates reports that classify findings as known, likely, or potential problems. Its free web-page and PDF checking makes it suited to individual developers, accessibility specialists, and small teams that need a practical starting point without committing to a paid subscription. The standalone codebase is open source under GPL-2.0, and the product is available through web and self-hosted options.
The core workflow is focused on identifying and reviewing accessibility issues rather than managing a large testing pipeline. Findings can be viewed by guideline or source line, while potential barriers can be assessed through human review. AChecker also supports multiple accessibility guidelines and standards, with optional HTML and CSS validation through the W3C Markup Validation Service and W3C Jigsaw CSS Validator. PDF checks are available through the integrated Tingtun checker, giving the free offering broader document coverage than an HTML-only checker. The published category scope includes WCAG 2.1, automated scans, manual review tools, mobile testing, and remediation guidance.
Paid options extend the basic checker rather than changing its central purpose. AChecker Basic adds WCAG 2.0 AA checks plus web and PDF reports for a domain. Lighthouse Single adds AChecker features with either mobile or desktop Lighthouse checks, while Lighthouse Full includes both mobile and desktop checks. These plans fit teams that need recurring domain reports or browser-rendered Lighthouse coverage. AChecker is less suitable for organizations seeking CI/CD integration or broader enterprise testing workflows. Choose it for accessible HTML and PDF checks with source-level findings and human review; consider an alternative when continuous pipeline automation is a primary requirement.
AChecker pros and cons
- Where it wins
- Accepts URLs, uploaded HTML files, and pasted source
- Separates known, likely, and potential accessibility problems
- Supports guideline views, source-line findings, and human review
- Where it doesn't
- Limited enterprise breadth without CI/CD support
- Paid tiers add recurring reports and Lighthouse checks
- PDF checking runs through an integrated external checker
AChecker fact sheet, pricing and score →
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