Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does the Color Contrast Checker do?
It checks the contrast ratio between a text color and a background color against the WCAG AA and AAA accessibility thresholds.
How do I use the generated code?
Adjust the controls until the preview looks right, then copy the generated CSS and paste it into your own project's stylesheet.
Does passing this guarantee my site is accessible?
Contrast is one important part of accessibility, but passing this check alone doesn't guarantee full WCAG compliance — it covers color contrast only, not other accessibility requirements like keyboard navigation or screen-reader support.
Is my input sent anywhere?
Everything runs in your browser — nothing you type or paste is sent to a server.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "Color Contrast Checker (WCAG)" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.