Free Online Color Contrast Checker (WCAG)
Free online color contrast checker for WCAG 2.1 AA/AAA with pass/fail results, suggestions, and simple color-blind simulation. Runs locally.
Check WCAG contrast ratio for foreground/background colors (local only, no uploads).
Sample text
The quick brown fox jumps over the lazy dog. 0123456789
Aa
Results
Contrast ratio: 17.85
AA (normal text) ≥ 4.5PASS
AA (large text) ≥ 3.0PASS
AAA (normal text) ≥ 7.0PASS
AAA (large text) ≥ 4.5PASS
Suggested foreground
Use black: 21.00Use white: 1.00