ACCESSIBILITY / BROWSER-LOCAL UTILITY
Color Contrast Checker
Calculate WCAG 2.2 text contrast ratios for two hex colors locally in your browser.
Processed in your browser · No account or file upload needed
How to use this utility
Calculate contrast using the WCAG relative luminance formula. WCAG 2.2 AA requires a ratio of at least 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1 for normal text and 4.5:1 for large text. Large text has specific size and weight definitions. This tool tests two opaque hex colors only; it does not analyze transparency, images, font weight, or real page styles. Read W3C's guidance.
Local processing: This page performs calculations in your browser. It does not make remote API requests, persist your input, or send telemetry. Input is capped to protect responsiveness.
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