Contrast Checker
Check text/background contrast ratio for WCAG AA and AAA accessibility compliance.
The quick brown fox
Small text sample — 14px regular weight
ℹ️ About this tool
Contrast Checker calculates WCAG 2.1 contrast ratios using the official relative luminance formula, reporting AA and AAA compliance for normal and large text. Accessible contrast is a legal requirement in many jurisdictions. All calculations run entirely in your browser — no data is transmitted.