HTML QA · Local review
HTML Accessibility Checker
Paste or upload HTML to check common accessibility failures: missing language and title, skipped headings, unlabeled controls, missing image alternatives, unnamed links and buttons, table headers, landmarks, and duplicate IDs.
Runs locally: your HTML is parsed and checked inside this browser tab. Pasted and uploaded content is not sent to Quick Test Hub or a third-party API.
Catch deterministic issues
Get selectors, severity, reasons, and practical repair guidance.
Paste or upload HTML
Run a focused local accessibility scan.
This checker reviews static markup. It does not execute scripts or prove WCAG conformance.
Paste HTML or load the example to begin.
Automated plus manual
Finish the checks automation cannot cover.
Accessibility depends on behavior, design, content, and assistive technology—not markup alone.
Reach and operate every interactive control, verify focus order, and confirm the focus indicator stays visible.
Review landmarks, names, descriptions, state changes, errors, and reading order with assistive technology.
Measure text and UI contrast across default, hover, focus, selected, disabled, error, and high-contrast states.
Test 200% zoom and narrow viewports without lost content, overlapping controls, or two-dimensional scrolling.
Check reduced-motion behavior, pause controls, flashing content, captions, transcripts, and audio descriptions.
Add automated and manual accessibility checks to a repeatable release test plan.
How to check HTML accessibility
- Paste a complete HTML document or upload an HTML file.
- Run the local check and review each issue's selector, reason, and suggested repair.
- Fix errors first, then review warnings in the context of the actual interface.
- Repeat the scan and complete keyboard, screen reader, contrast, zoom, motion, and content tests manually.
What this accessibility checker tests
The checker looks for deterministic markup issues involving document language, title, headings, landmarks, images, form labels, accessible names, empty links, table headers, iframes, media captions, positive tabindex values, and duplicate IDs.
Accessibility checker limitations
This tool does not execute JavaScript, inspect CSS, render at different viewports, calculate color contrast, understand visual reading order, or operate a screen reader. Passing automated checks does not establish WCAG, ADA, EN 301 549, or legal compliance.
HTML accessibility checker FAQ
Is pasted HTML private?
Yes. Parsing and rule checks run locally in the current browser tab.
Why does the checker report warnings?
Some patterns require human judgment. For example, generic link text can be meaningful in context, and an empty alternative can be correct for a decorative image.
What should I test after fixing the results?
Test the rendered product with keyboard-only navigation, screen readers, zoom and reflow, contrast tools, reduced motion, and realistic error and validation flows.