Accessibility

Find the right tool and get straight to your task.

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Color blindness simulator

Preview how colors may appear with different types of color blindness.

Accessible palette

Compare contrast between foreground and background colors in a palette.

HTML accessibility checker

Find missing image descriptions and labels in pasted HTML.

ARIA Relationship Checker

Find broken ARIA label, description and control references in HTML. Runs locally and returns a reviewable report.

Caption Coverage Checker

Compare speech and caption time ranges and expose missing intervals. Runs locally and returns a reviewable report.

Color-Only Signal Checker

Review status designs for signals that may rely on color without text or symbols. Runs locally and returns a reviewable report.

Document Language Tag Checker

Find missing or inconsistent language and direction declarations in HTML. Runs locally and returns a reviewable report.

Focus Indicator Checker

Review CSS focus styles for rules that remove visible indicators without a replacement. Runs locally and returns a reviewable report.

Reduced Motion Preview Checker

Check CSS for a prefers-reduced-motion path when motion is present. Runs locally and returns a reviewable report.

Text Spacing Resilience Tester

Preview larger text-spacing overrides and identify simple clipping risks in supplied HTML. Runs locally.

Touch Target Spacing Checker

Review CSS interactive controls for dimensions smaller than a practical touch target. Runs locally and returns a reviewable report.

Alt text generator

Draft an image description you can review for alt text.

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About accessibility

Designers, developers and content editors use these free accessibility tools to find barriers before a page goes live. The Color blindness simulator shows how a design looks with common color vision deficiencies, and the Accessible palette helps you build color sets with readable contrast. For markup, the HTML accessibility checker, ARIA Relationship Checker and Focus Indicator Checker flag common problems, while the Text Spacing Resilience Tester and Touch Target Spacing Checker test layout limits.

Pick a tool by the question you need answered. If the concern is color, start with the simulator or the Color-Only Signal Checker. If it is structure or keyboard use, paste your HTML into one of the checkers and fix the issues it lists.

Popular accessibility

Common questions

Can these tools confirm that my site meets WCAG?

No automated tool can confirm full conformance. These checkers flag common, testable problems such as broken ARIA references, weak focus styles or missing language tags. Use the results as a starting list, then test with a keyboard, a screen reader and real people.

Are my images and HTML uploaded?

The Color blindness simulator, Accessible palette, HTML accessibility checker, ARIA Relationship Checker and Focus Indicator Checker run in your browser. Your images and markup are processed on your device and are not sent to our server as part of the check.

What does the color blindness simulator show?

It previews an image or design as it may appear with common types of color vision deficiency. Use it to spot information that depends on hue alone, then add labels, patterns or stronger contrast so the meaning survives for every viewer.