Color Contrast Checker
Sample Text
Large Text Sample (18pt+)
Level AA
Level AAA
? Frequently Asked Questions
What is color contrast ratio?
Contrast ratio (1:1 to 21:1) measures luminance difference between foreground and background colors. 21:1 is black on white (maximum), 1:1 is same color (no contrast). It determines text readability.
What are WCAG compliance levels?
WCAG 2.1 has three levels: Level A (minimum), AA (recommended, 4.5:1 for normal text, 3:1 for large), AAA (enhanced, 7:1 for normal text, 4.5:1 for large). Most websites target AA compliance.
What contrast ratio should I aim for?
Normal text needs 4.5:1 minimum for AA, 7:1 for AAA. Large text (18pt+ or 14pt+ bold) needs 3:1 for AA, 4.5:1 for AAA. Higher ratios ensure readability for vision-impaired users.
Does font size affect contrast requirements?
Yes! Large text (18pt+) has lower requirements because size improves readability. Small text needs higher contrast. If choosing between larger text and higher contrast, high contrast generally helps more.
Can it suggest better color combinations?
The checker can suggest alternatives by adjusting lightness/darkness of colors to meet WCAG standards while maintaining your color scheme's general aesthetic.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.