What does the HTML Accessibility Checker do?

You paste HTML and it finds common accessibility problems: images without alt text, inputs without labels, buttons without names, skipped heading levels, duplicate IDs, and tables without headers.

How is the score calculated?

The tool starts at 100 and subtracts points per issue, weighted by severity. Errors cost more than warnings.

Does it replace a screen reader test?

No. It catches common code-level issues, but real accessibility testing still needs keyboard checks and screen reader testing.

Is my HTML uploaded anywhere?

No. Everything runs in your browser; your HTML never leaves your device.

Yes, it is free and needs no signup.

HTML Accessibility Checker — Alt and Labels

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Accessibility score

Issues found