Contrast checker
Check the WCAG contrast ratio between a text and background color, with AA/AAA verdicts.
How to use
Contrast checker lets you check the WCAG contrast ratio between a text and background color, with AA/AAA verdicts. Pick or paste a colour and every format and value updates instantly.
Colour maths runs entirely in your browser, so the tool works offline. It's completely free, with no sign-up, no watermarks and no limits on how often you use it.
Examples
Enter a colour in one format and copy it in HEX, RGB or HSL — whichever you need.
Once contrast checker shows your output, use the copy or download button to grab it — no retyping.
Frequently asked questions
Is Contrast checker free to use?
Yes. Contrast checker is completely free with no sign-up, no watermarks and no usage limits.
Is my data private?
Yes. Colour maths runs entirely in your browser, so the tool works offline.
Does Contrast checker work on mobile?
Yes. It works in any modern browser on desktop, tablet or phone, and keeps working offline once the page has loaded.
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