Color Contrast Analyzer
Check WCAG 2.1 contrast ratios for any color pair. Get pass/fail badges for AA and AAA levels, a live text preview, and automatic suggestions if your colors fail AA compliance.
The quick brown fox
jumps over the lazy dog. 0123456789 !@#$%
Small body text — this is how 12px text looks on this background.
WCAG 2.1 contrast ratio requirements
The Web Content Accessibility Guidelines (WCAG) 2.1 define minimum contrast ratios to ensure text is readable by people with low vision or color deficiencies.
- AA Normal text — contrast ratio ≥ 4.5:1 for text smaller than 18px regular / 14px bold.
- AA Large text — contrast ratio ≥ 3:1 for large text (18px+ regular or 14px+ bold).
- AAA Normal text — contrast ratio ≥ 7:1 (enhanced, for maximum accessibility).
- AAA Large text — contrast ratio ≥ 4.5:1 for large text (enhanced).
How contrast ratio is calculated
The contrast ratio uses relative luminance values (L1 and L2) computed from the sRGB color values. The formula is (L1 + 0.05) / (L2 + 0.05) where L1 is the lighter color's luminance and L2 is the darker one's.
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