Color Contrast Checker
Enter a text color and a background color, and this checker calculates their WCAG contrast ratio and shows whether it passes AA and AAA for normal and large text — with a live preview. It uses the official relative-luminance formula and runs entirely in your browser: free, instant, and no sign-up.
Contrast ratio
17.74:1
Frequently asked questions
Enter your text (foreground) color and background color as hex values or pick them, and the tool computes the WCAG contrast ratio between them. It then shows pass or fail badges for AA and AAA at both normal and large text sizes, plus a live preview so you can see the pairing.
WCAG 2.2 Level AA requires a ratio of at least 4.5:1 for normal text and 3:1 for large text, while the stricter Level AAA requires 7:1 for normal text and 4.5:1 for large text. User-interface components and graphics need at least 3:1.
WCAG defines large text as at least 18pt (about 24px) for regular weight, or 14pt (about 18.66px) when bold. Anything smaller than that is treated as normal text and must meet the higher 4.5:1 (AA) threshold.
Yes — free, no sign-up, and the luminance and ratio math runs entirely in your browser, so nothing you enter is uploaded.
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