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Interactive Contrast Checker

Color

Check color contrast ratios for WCAG accessibility compliance.

ttb run contrast-checker

Preview Text

The quick brown fox jumps over the lazy dog

Small text sample — 14px equivalent

17.06:1

Excellent Contrast

✓ Pass
AA Normal
4.5:1 required
✓ Pass
AA Large
3:1 required
✓ Pass
AAA Normal
7:1 required
✓ Pass
AAA Large
4.5:1 required
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How to Use Contrast Checker

Enter a foreground (text) color and background color. The tool calculates the contrast ratio and shows whether the combination passes WCAG 2.1 accessibility standards at AA and AAA levels for both normal and large text. A live preview demonstrates readability. Essential for accessible web design.

1

Enter your parameters

Configure the inputs for the Contrast Checker according to your specific needs.

2

View real-time results

The utility instantly processes your request and displays the calculated outputs directly in your browser.

3

Copy or Download

Click the copy icon next to the final output to instantly grab the result, or export it if applicable.

Frequently Asked Questions

What is WCAG AA vs AAA?+
WCAG AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px+ or 14px+ bold). AAA requires 7:1 for normal text and 4.5:1 for large text. AA is the minimum legal standard; AAA is the gold standard for accessibility.
Why does contrast matter?+
Low contrast text is difficult or impossible to read for people with low vision, color blindness, or in bright ambient light conditions. WCAG compliance isn't just good design — it's a legal requirement in many jurisdictions (ADA, Section 508, EAA).
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