WCAG Color Contrast Checker - Accessibility Compliance Contrast Tester
Calculate relative luminance and contrast ratios between text and background colors. Meet WCAG AA and AAA accessibility standards to ensure optimal readability for all users.
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How to use WCAG Color Contrast Checker Online
Step 1: Select or type your foreground (text) and background color hex codes.
Step 2: Observe the calculated relative contrast ratio updated dynamically.
Step 3: Review the AA and AAA compliance checklist for small text, large text, and visual UI components.
Frequently Asked Questions
What are the WCAG 2.1 contrast ratio standards?
WCAG AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text. WCAG AAA raises these targets to 7:1 and 4.5:1 respectively.
How does the contrast score affect web SEO?
Search crawlers like Google prioritize sites with accessible layouts and readable text, directly boosting search rankings.
Does it suggest accessible alternatives?
Our checker lets you tweak color channels interactively, helping you find matching accessible swatches quickly.