Color Contrast Checker

Check the contrast between a text colour and a background colour against the WCAG AA and AAA thresholds.

Colour contrast checker

Pick a text colour and a background colour. The WCAG ratio and AA / AAA results appear below.

Nothing checked yet

Enter two colours above, then press “Check contrast”.

Large text means about 18.66px bold or 24px regular. Ratios use the WCAG relative-luminance formula and ignore transparency.

Runs entirely in your browser. Nothing is uploaded.

How it works

This utility runs locally in your browser for privacy and speed.

1 ⚡

Unlimited local tools

This run costs 1 credit(s) and is saved to your history automatically.

Log in to save and view your usage history.

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Frequently asked questions

Do I get free credits to try Color Contrast Checker?
Yes — new accounts get 3 free credits to spend on any tool, Color Contrast Checker included. After that you only pay for what you run.
How many credits does Color Contrast Checker cost?
Everything runs in your browser and nothing is uploaded: free accounts pay 1 credit per run, and Pro or Pro+ members run it as often as they like.
Is the content I paste private?
Color Contrast Checker uses your input only to generate the result. Stored results are deleted automatically by our retention policy, and you can remove any run from your history.
Do I need to install anything?
No. Color Contrast Checker works in any modern browser — nothing to download or install.

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