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Color Contrast Checker

Tool guide / 工具说明

Color Contrast Checker for fast browser-based work

Check foreground and background color contrast against WCAG AA readability thresholds.

中文：检查前景色和背景色是否满足 WCAG AA 可读性对比度阈值。

Example: Verify button text, dashboard labels, landing page copy, and UI states before publishing.

Practical workflows

Where this tool fits in real work

Use cases

  • Check button, badge, and dashboard label colors before shipping a UI change.
  • Compare foreground/background pairs against common WCAG AA readability thresholds.
  • Use the color converter when you need nearby color variants after a failed contrast check.

Review notes

  • Contrast is one accessibility signal, not a replacement for a complete accessibility review.
  • Check hover, disabled, and selected states separately when they use different colors.

Local-first handling

This page is built as a browser utility. Inputs are processed in the page where possible, with no account requirement and no intentional upload step for the tool workflow.

Use with judgment

When to use Color Contrast Checker

Good fit

  • Check button, badge, and dashboard label colors before shipping a UI change.
  • Compare foreground/background pairs against common WCAG AA readability thresholds.
  • Use the color converter when you need nearby color variants after a failed contrast check.

Before copying results

  • Contrast is one accessibility signal, not a replacement for a complete accessibility review.
  • Check hover, disabled, and selected states separately when they use different colors.

Use a stricter workflow

If the original file needs quality, metadata, or evidentiary value, do not keep only the compressed output.

Related guides

Keep learning this workflow

Why local-first browser tools matterDecide which tasks belong in browser-local tools. Color Contrast Checker for AccessibilityCheck whether text and background colors are readable enough before publishing UI changes. Private Online Tools: What to CheckA practical checklist for choosing browser tools when privacy, speed, and trust matter.
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FAQ

Color Contrast Checker questions

Which contrast rules are checked?

The tool checks common WCAG AA thresholds for normal and large text.

Does it replace a full accessibility audit?

No. It is a quick color contrast check.

Is this tool free?

Yes. The current Toolkits tools are free to use and do not require an account. If advertising is added later, it should be clearly labeled and kept away from primary tool controls.