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Overview

Color Contrast Checker is a color tool that Color contrast checker: calculate contrast per WCAG 2.1 and AA/AAA pass with picker and replacement suggestions for accessible design. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

• Check WCAG contrast while picking UI colors to avoid accessibility rejections
• Generate harmonious palettes and complementary colors for campaigns
• Convert HEX to RGB/HSL and copy as CSS variables for handoff
• Experiment with gradients and shadows for illustrations and video
• Use it to cross-check “颜色对比度、wcag” in reports, docs or APIs to avoid manual conversion errors

How to use

1. 1 Pick a color via picker or enter HEX/RGB/HSL values
2. 2 Switch color spaces and watch live preview and contrast scores
3. 3 Copy results as CSS, Tailwind or design-token formats
4. 4 Export palettes as ASE/JSON for Figma or Photoshop

Highlights

• Local & private: processing stays in your browser
• Live validation with tolerant parsing
• One-click copy and export for docs, code or sheets
• Batch and offline support under poor network

Notes

• Alpha affects blended contrast; re-check on final background
• Displays vary—verify critical colors on target devices
• Export large palettes in batches to avoid memory spikes

FAQ