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WCAG Color Contrast Checker

Check WCAG 2.1 AA and AAA color contrast ratio between text and background. Live accessibility testing tool.

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Test text and background color accessibility contrast

Verify that your website color palette complies with WCAG 2.1 AA and AAA accessibility standards. Get exact contrast ratios and pass/fail indicators for normal and large text.

How WCAG Color Contrast Checker Works

Paste or enter your input in the field above. Most tools update in real time. Click the Copy button to copy the output. All processing happens in your browser—your data never leaves your device unless the tool explicitly uses a server feature (such as URL shortening or bcrypt hashing).

This tool is part of the CSS Tools category. Check similar tools below. All everytools are free, no signup required. Works on desktop and mobile.

Common Use Cases

  • Audit UI color schemes for Web Accessibility (WCAG 2.1)
  • Ensure button labels and body text remain readable for vision-impaired users
  • Select accessible dark mode and high-contrast theme palettes

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Frequently Asked Questions

What is the minimum WCAG contrast ratio for normal text?
WCAG 2.1 Level AA requires a contrast ratio of at least 4.5:1 for normal text (under 18pt / 24px) and 3.0:1 for large text.
What ratio is required for Level AAA compliance?
Level AAA requires a contrast ratio of 7.0:1 for normal text and 4.5:1 for large text.
How is contrast ratio calculated?
The contrast ratio is calculated using relative luminance values (L1 + 0.05) / (L2 + 0.05) as defined by the W3C WCAG specification.