Contrast Checker

Contrast Checker is a free color & design tool that runs entirely in your browser — wCAG AA / AAA pass checks. No upload, no account, no limits.

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How to use Contrast Checker

Open the Contrast Checker tool.
Paste or type your color value into the input field.
The output updates as you type — adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.

About Contrast Checker

Check the contrast ratio between a foreground and background color against the WCAG accessibility thresholds. A live text sample shows the pairing, and pass/fail badges cover AA and AAA for both normal and large text.

What people use it for

Verify text meets WCAG AA or AAA contrast for accessibility.
Choose a readable text color against a given background.

Frequently asked questions

Which levels are checked?

WCAG AA and AAA, for both normal and large text, with the exact contrast ratio.

What's a passing ratio?

4.5:1 for AA normal text, 3:1 for AA large, and 7:1 for AAA normal.

Is it private?

Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.