Color Contrast Checker

The Web Content Accessibility Guidelines (WCAG) are the international standard for web accessibility. Color contrast requirements ensure that people with low vision, color blindness, or aging eyes can read your content.

The Three Levels

• WCAG A (1.4.3): Minimum contrast — 4.5:1 for normal text, 3:1 for large text
• WCAG AA: The most widely required standard. Required by ADA, Section 508, EN 301 549
• WCAG AAA: Enhanced — 7:1 for normal text, 4.5:1 for large text. Best for body copy

What Counts as "Large Text"?

WCAG defines large text as 18pt (24px) or larger, OR 14pt (approximately 18.67px) bold or larger. Headlines on a website typically qualify; body copy does not.

Common Failures

Light gray text on white backgrounds is the most common failure. Medium gray (#888888) on white has a contrast ratio of only 3.54:1 — failing AA for normal text. Dark gray (#595959) on white barely passes AA at 4.6:1.