Color Contrast Checker

WCAG Contrast, Explained

Web accessibility guidelines (WCAG) require sufficient contrast between text and its background so everyone can read it. The ratio ranges from 1:1 (identical) to 21:1 (black on white). The thresholds: AA needs 4.5:1 for normal text and 3:1 for large text (≥18.66px bold or ≥24px); AAA needs 7:1 and 4.5:1 respectively. WCAG 2.1 also requires 3:1 for UI components such as icons, form field borders, and focus indicators. Ratios use the official relative-luminance formula, computed locally in your browser.