Contrast Ratio Checker
Check any color pair's WCAG contrast ratio with AA/AAA verdicts for normal and large text. Prove 4.5:1 before shipping — free, local, no signup.
How to Use the Contrast Ratio Checker
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Frequently Asked Questions
What ratio passes?
4.5:1 for normal text (AA), 3:1 for large text and UI components, 7:1 for AAA. Test body copy at AA minimum always.
How do I fix failures?
Darken text or lighten background incrementally — small moves cross thresholds. The tool suggests nearest passing shades.
Large text definition?
18pt+ regular or 14pt+ bold qualifies for the 3:1 bar. Headlines pass where body fails — test both.
Are colors uploaded?
No — math runs locally in your browser. Nothing leaves your device.
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Last updated October 2026