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Contrast Checker

Color

Check color contrast ratios for WCAG AA and AAA compliance with pass/fail indicators.

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Color Contrast Checker

Check contrast ratio between two colors for WCAG accessibility compliance

RGB: 0, 0, 0
RGB: 255, 255, 255
21.00:1
Contrast Ratio
✓ PASS
AA Large Text
✓ PASS
AA Normal Text
✓ PASS
AAA Large Text
✓ PASS
AAA Normal Text
Preview

Normal Text (16px) - The quick brown fox jumps over the lazy dog

Small Text (12px) - The quick brown fox jumps over the lazy dog

Large Text (20px Bold) - The quick brown fox

Preset Combinations
WCAG Requirements

AA Normal Text: 4.5:1 minimum

AA Large Text: 3:1 minimum (18pt+ or 14pt+ bold)

AAA Normal Text: 7:1 minimum

AAA Large Text: 4.5:1 minimum

Quick answers for Contrast Checker

What does the Contrast Checker do?
Check color contrast ratios for WCAG AA and AAA compliance with pass/fail indicators. The Contrast Checker is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the Contrast Checker?
Open the Contrast Checker on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the Contrast Checker free to use?
Yes. The Contrast Checker is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the Contrast Checker safe and private?
Yes. The Contrast Checker processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
What color formats does the Contrast Checker support?
The Contrast Checker works with the formats web developers reach for every day - HEX, RGB / RGBA, and HSL. You can copy any value with one click for use in CSS, design tools, or code.
Can I use the Contrast Checker offline?
Once the page has loaded, the Contrast Checker continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.