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Color Contrast Checker

Calculate WCAG 2 contrast for two opaque sRGB HEX colors and check AA/AAA text thresholds.

Convert in your browser · No sign-up

Normal text uses 4.5:1 for AA and 7:1 for AAA; large text uses 3:1 and 4.5:1. Alpha blending and font-size eligibility are not evaluated.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Calculate WCAG 2 contrast for two opaque sRGB HEX colors and check AA/AAA text thresholds.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

#000000 on #ffffff → 21:1

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: