Free Online Tool

Contrast Checker

Test foreground vs background contrast for WCAG AA & AAA compliance — with one-click auto-fix.

The quick brown fox jumps over the lazy dog

5.70:1 contrast

Text color

Background color

Normal text AA (4.5:1)PASS

Normal text AAA (7:1)FAIL

Large text AA (3:1)PASS

Large text AAA (4.5:1)PASS

Quick Fix nudges the background lightness the smallest amount that passes.

WCAG thresholds

Normal text needs 4.5:1 for AA and 7:1 for AAA; large text (18pt+, or 14pt bold) needs 3:1 for AA and 4.5:1 for AAA. Failing a pair? The auto-fix nudges the background the smallest amount that passes.

Working from a picture? Probe its colors, convert formats, or simulate color blindness.