Contrast Checker
Check the contrast ratio between a text and background color against WCAG AA and AAA guidelines, with live previews so you can ship accessible, readable interfaces.
Runs entirely in your browser — nothing is uploaded.
About Contrast Checker
Check the contrast ratio between a text and background color against WCAG AA and AAA guidelines, with live previews so you can ship accessible, readable interfaces.
- Calculates the exact contrast ratio and grades it against WCAG AA and AAA.
- Live preview shows normal and large text on your chosen colors.
- 100% local — paste brand colors without sending them anywhere.
Contrast Checker is part of Upwwards Tools, a free collection of browser-based utilities built by the team at Upwwards. Like the rest of the suite, it's free, requires no sign-up, and keeps your data on your device.
Frequently asked questions
What is Contrast Checker?
Check the contrast ratio between a text and background color against WCAG AA and AAA guidelines, with live previews so you can ship accessible, readable interfaces.
Is Contrast Checker free to use?
Yes — Contrast Checker is completely free with no sign-up, account or usage limits. It is part of the free Upwwards Tools collection built by Upwwards.
Is my data private when I use Contrast Checker?
Contrast Checker runs entirely in your browser. Everything you enter or upload is processed locally on your device and is never sent to a server, stored or logged.
Do I need to install anything to use Contrast Checker?
No. Contrast Checker works instantly in any modern web browser on desktop or mobile — there is nothing to download or install.