Is the Contrast Checker free to use?

Yes, the Contrast Checker is completely free. There is no sign-up, no account required, and no limit on how often you can use it.

What colour formats does the Contrast Checker support?

The Contrast Checker works with HEX, RGB and HSL colour formats. You can convert between them and copy any value with one click.

What devices does the Contrast Checker work on?

The Contrast Checker works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.

🎨 Color Tools

Color Contrast Checker

Check WCAG 2.1 contrast ratios for web accessibility. Shows AA and AAA pass/fail for normal text, large text and UI components. Live preview.

The Contrast Checker is a free online tool that helps you check wcag 2.1 contrast ratios for web accessibility. shows aa and aaa pass/fail for normal text, large text and ui components. live preview It runs in your browser with no sign-up, downloads, or installation needed. All processing happens locally — your data stays on your device.

Text / foreground color

Background color

Large text preview (18pt bold)

Normal body text preview — how readable is this combination for everyday reading?

Badge preview

Contrast ratio

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How to use the Contrast Checker

Pick your color pair

Select your text color and background color. The contrast ratio and WCAG results update instantly. The live preview shows exactly how your text will look at different sizes and in different UI elements.

WCAG AA vs AAA

WCAG 2.1 AA requires a ratio of 4.5:1 for normal text (3:1 for large text). AAA requires 7:1 (4.5:1 for large). AA is the legal minimum for most accessibility standards. AAA is the highest accessibility level. A ratio below 3:1 fails all levels and should not be used for readable text.

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