Contrast Checker
Verify WCAG AA and AAA accessibility compliance for any color pair in seconds.
The quick brown fox jumps over the lazy dog
Large Text Sample (18pt+)
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v2.4.0-Stable∞
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Process in milliseconds.
Knowledge Base
Frequently Asked Questions
What is WCAG contrast ratio?↓
WCAG requires minimum contrast ratios for readable text. AA requires 4.5:1 for normal text and 3:1 for large text. AAA requires 7:1 for normal text.
How do I use the contrast checker?↓
Enter foreground (text) and background colors. The checker instantly shows the contrast ratio and whether it passes WCAG AA and AAA standards.
What contrast ratio do I need to pass WCAG AA?↓
Normal text (under 18px): 4.5:1 minimum. Large text (18px+ or 14px+ bold): 3:1 minimum. These are the legal accessibility requirements in many countries.
Can the tool suggest accessible color alternatives?↓
Yes. If your colors fail the contrast check, the tool suggests the nearest colors that pass AA standards while staying close to your original choices.