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Pixeliro
Free Online Tool

Color Contrast Checker - WCAG Accessibility Tool

Check color contrast ratios for WCAG 2.1 accessibility compliance. Test AA and AAA standards for text, large text, and UI components. Real-time preview with pass/fail indicators.

Pixeliro Logo

Text

#FFFFFF

Background

#1A1A25

Typography Scale Preview

Display48px / Bold
3:1
Heading 230px / Semibold
3:1
Heading 3 / Large18px+ or 14px Bold
3:1
Body text - Normal paragraph content16px / Regular
4.5:1
Small text - Captions, labels, helper text14px / Regular
4.5:1
Tiny text - Legal, footnotes (enhanced)12px / Regular
7:1

UI Components

BadgeTagLink text

AA Large

≥ 3:1

18px+ text

AA Normal

≥ 4.5:1

All text sizes

AAA Enhanced

≥ 7:1

Best practice

Key Features

Powerful features designed for designers and developers

WCAG 2.1 Compliance

Check against official Web Content Accessibility Guidelines with clear pass/fail results for each criterion.

AA & AAA Testing

Test both AA (minimum) and AAA (enhanced) contrast requirements. See exactly where your colors stand.

Real-time Preview

See your color combinations applied to actual text as you adjust. Instant visual feedback on readability.

Smart Suggestions

Get AI-powered color suggestions that maintain your design intent while meeting accessibility standards.

Multiple Color Formats

Input colors in HEX, RGB, HSL, or by name. Copy results in any format for your workflow.

Component Preview

Preview your colors in realistic UI components like buttons, cards, and forms. Not just text samples.

How It Works

Get started in just a few simple steps

  1. 1

    Enter Foreground Color

    Type or paste your text/foreground color in HEX, RGB, or HSL format. You can also use the color picker.

  2. 2

    Enter Background Color

    Add your background color the same way. The contrast ratio calculates automatically.

  3. 3

    Review WCAG Results

    See instant pass/fail results for Normal Text AA, Normal Text AAA, Large Text AA, and Large Text AAA.

  4. 4

    Get Suggestions (if needed)

    If your colors fail, click "Suggest" to get accessible alternatives that preserve your design intent.

  5. Export & Share

    Copy the color values, share a link to your results, or export as a design token.

Frequently Asked Questions

Everything you need to know

What is WCAG contrast ratio?

WCAG (Web Content Accessibility Guidelines) defines minimum contrast ratios between text and background colors to ensure readability for people with visual impairments. AA requires 4.5:1 for normal text, AAA requires 7:1.

What's the difference between AA and AAA?

AA is the minimum accessibility standard (4.5:1 for normal text, 3:1 for large text). AAA is enhanced accessibility (7:1 for normal text, 4.5:1 for large text). Most guidelines require AA compliance.

What counts as "large text"?

Large text is defined as 18pt (24px) or larger for regular weight, or 14pt (18.66px) or larger for bold weight. Large text has lower contrast requirements.

Does this tool check contrast for colorblind users?

While contrast ratio helps colorblind users, we also offer a colorblind simulation tool that shows how your colors appear to users with different types of color vision deficiency.

Can I test multiple color combinations at once?

Yes! Use our batch contrast checker to test an entire color palette against your background colors, identifying any accessibility issues across your design system.

Is WCAG 2.1 the latest standard?

WCAG 2.1 is the current widely-adopted standard. WCAG 2.2 was released in 2023 and our tool is being updated to include its new criteria for focus appearance.

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