🎨 Color Contrast Checker
Check if your text meets WCAG AA/AAA accessibility standards. Enter foreground and background colors — get instant contrast ratio and compliance results.
How It Works
This tool calculates contrast using the WCAG 2.1 relative luminance formula. Each color's RGB values are linearized (sRGB → linear), then luminance is computed as: L = 0.2126 × R + 0.7152 × G + 0.0722 × B. Contrast ratio = (L1 + 0.05) / (L2 + 0.05), where L1 is the lighter color.
WCAG Levels: AA is the minimum for accessibility compliance. AAA is the enhanced level. Large text (≥18px or bold ≥14px) has lower thresholds because larger text is easier to read.
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