Colour Contrast Checker

Check any text and background pair against WCAG AA and AAA, with the exact ratio.

Free, runs entirely in your browser, and nothing you enter is ever uploaded to a server.

Frequently asked questions

What ratio do I need to pass?

WCAG AA asks for 4.5:1 on body text and 3:1 on large text. AAA raises those to 7:1 and 4.5:1.

What counts as large text?

18pt, or 14pt when bold — roughly 24px, or 18.5px bold.

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