WCAG Contrast Checker
Check the contrast between text and background colors per WCAG 2.1 guidelines. Shows the ratio and AA/AAA levels for normal and large text.
Normal size text (16px)
Large text (24px bold)
Small text (12px)
Contrast ratio
maximum 21:1 (black on white)
Understanding WCAG
The Web Content Accessibility Guidelines (WCAG 2.1) define minimum contrast standards to ensure readability for people with low vision.
- • AA — Normal text: ratio ≥ 4.5:1
- • AA — Large text (≥18pt or ≥14pt bold): ratio ≥ 3:1
- • AAA — Normal text: ratio ≥ 7:1
- • AAA — Large text: ratio ≥ 4.5:1
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