Color Contrast Checker
Check color contrast ratios for WCAG 2.1 accessibility compliance. Test foreground and background colors for AA and AAA standards. Free online tool.
Free WCAG contrast checker. Test color combinations for AA and AAA compliance. Essential for accessible web design. Shows pass/fail instantly.
- ✓ Calculate contrast ratio between any two colors
- ✓ Test against WCAG AA and AAA standards
- ✓ Check both normal and large text compliance
- ✓ Live preview of color combinations
- ✓ Swap colors button for quick testing
How to Check Color Contrast
- 1 Enter or pick a foreground (text) color
- 2 Enter or pick a background color
- 3 View the calculated contrast ratio
- 4 Check WCAG AA and AAA compliance results
- 5 Use the swap button to reverse colors if needed
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1