Free Accessibility Checker

What this tool checks

This tool runs 42 automated accessibility checks against your page, covering WCAG 2.1 guidelines. It checks image alt text, form label associations, ARIA attribute validity, color contrast ratios, heading hierarchy, skip navigation links, keyboard accessibility, document language, duplicate IDs, and more. Many checks are powered by Google Lighthouse's accessibility audit engine.

Why it matters

Web accessibility isn't optional. Over 1 billion people worldwide live with some form of disability. Beyond the ethical imperative, accessibility lawsuits have increased dramatically, with over 4,000 ADA web accessibility cases filed in the US in recent years. Accessible sites also tend to rank better because search engines value semantic, well-structured HTML.

Common issues we find

• Images missing alt text, making them invisible to screen readers
• Form inputs without associated labels, confusing assistive technology
• Insufficient color contrast ratios failing WCAG AA requirements
• Skipped heading levels (e.g., jumping from H1 to H3), breaking document outline
• Missing skip navigation link, forcing keyboard users to tab through every element