Contrast Checker online (free, in your browser)
Check WCAG contrast between two colours. Runs in your browser. No signup. Files and text stay on your device.
WCAG 2.x contrast ratio from relative luminance. Try HEX or rgb(r,g,b).
Large text sample
Normal body text at 16px for readability checks.
19.80 : 1
- Normal text: AAA (needs 4.5 AA, 7 AAA)
- Large text: AAA (needs 3 AA, 4.5 AAA)