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Color Contrast Checker

Developer Tools

Check color contrast ratios for WCAG compliance.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What Color Contrast Checker does

The Color Contrast Checker calculates the contrast ratio between a foreground and background color and tells you whether it passes WCAG AA and AAA accessibility standards for normal and large text. Enter or pick two colors and get an instant pass/fail readout — essential for making sure text stays readable for users with low vision.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use Color Contrast Checker

  1. Enter or pick a foreground (text) color
  2. Enter or pick a background color
  3. View the calculated contrast ratio and WCAG pass/fail results
  4. Adjust either color until it meets your target compliance level

Who should use it

Made for developers. Typical uses:

  • Checking that body text color meets WCAG AA contrast requirements before shipping a website
  • Verifying a button's text stays readable against its background color across a design system
  • Auditing an existing site's color palette for accessibility compliance issues

Frequently asked questions

Is the Color Contrast Checker free to use?
Yes, completely free.
Is my data uploaded anywhere?
No, contrast calculations run entirely in your browser.
What's the difference between AA and AAA compliance?
AA requires a 4.5:1 ratio for normal text (3:1 for large text), while AAA is stricter at 7:1 (4.5:1 for large text).
What counts as "large text" for the lower threshold?
Text that's at least 18pt, or 14pt if bold.
Can I use hex or RGB values?
Yes, the tool accepts hex codes and RGB values, plus a color picker for visual selection.

Learning resources

Explore more in Developer Tools, read the guides and articles, or see how we test our tools.

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