Source: https://restorebunny.com/tools/color-contrast-checker/

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# Color Contrast Checker

Compare two opaque sRGB colors using WCAG relative luminance. See contrast ratio and AA/AAA thresholds for normal and large text.

Free · No signupLocal browser processing

Text colorBackground color

Sample text on the chosen background.

**Result**Ready for your input

Your result will appear here

No signup or server upload.

This checks color contrast only. Large text means at least 18 pt regular or 14 pt bold under WCAG; passing this check does not certify a whole page’s accessibility.

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## How to use color contrast checker

1. Enter the values for your calculation.
2. Adjust the controls and inspect the result.
3. Download the calculation as text or revise your inputs.

## A practical example

Black on white has a 21:1 contrast ratio. Normal text needs at least 4.5:1 for WCAG AA; large text uses 3:1.

## Frequently asked questions

Is color contrast checker free to use?

Yes. This utility works without a signup or paid credit. Files and calculations are processed in this browser.

What should I check before using the result?

This checks color contrast only. Large text means at least 18 pt regular or 14 pt bold under WCAG; passing this check does not certify a whole page’s accessibility.

## Keep working on your photo

- [Browse all free tools](<https://restorebunny.com/tools/>)
- [Check photo resolution](<https://restorebunny.com/tools/photo-resolution-checker/>)

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By RestoreBunny · Reviewed 2026-10-16. Utilities use local calculations or [browser image processing](<https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas>). The download button identifies the output format. Animated images export one decoded frame. Keep your original files.