Is the Contrast Checker free to use?

Yes. Contrast Checker is completely free with no sign-up, no watermarks and no usage limits.

Are my files uploaded to a server?

No. Contrast Checker runs entirely in your browser — your files and data never leave your device.

Does it work on mobile and offline?

Yes. It works in any modern browser on desktop or mobile, and the toolkit is a PWA that keeps working offline after your first visit.

Contrast Checker

Check the contrast ratio between text and background colors against WCAG AA and AAA standards, with a live preview.

How it works

1
Configure
Adjust the controls for Contrast Checker to taste.
2
Preview live
See the result update instantly as you change settings.
3
Copy or download
Copy the generated code, or download the asset — ready to use.

Common uses

Verify body text passes WCAG AA before shipping a design system token.
Pick an accessible link color against a brand background.
Audit a button's text/background pair for AAA compliance.

About the Contrast Checker

Check the contrast ratio between text and background colors against WCAG AA and AAA standards, with a live preview.

Contrast Checker is part of a free, privacy-first toolkit. Output is rendered live in your browser and ready to copy or download — no account, no watermarks and nothing sent to a server.

Because contrast checker works without any sign-up or installation, you can use it as often as you like and it's always available — on desktop or mobile, and even offline.

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