WCAG color contrast checker.
Type a foreground and background color. Get the WCAG contrast ratio and the AA / AAA verdict for normal and large text. Live preview underneath.
Current text classified as normal (size 16px regular). Thresholds: AA 4.5:1, AAA 7:1.
The quick brown fox jumps over the lazy dog. 0123456789
This is how your text looks against this background.
WCAG 1.4.3 Contrast (Minimum)
WCAG 1.4.3 requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (18pt+ or 14pt bold+). It is the single most common WCAG violation in our scans.
The ratio is computed from the relative luminance of each color (sRGB → linearized RGB → weighted sum). Same formula every reputable accessibility tool uses.
Read the full WCAG 1.4.3 guide →Want to find every contrast failure on your site?
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