Contrast Checker
Choose text and background colors, preview them together, and check their contrast ratio.
This tool estimates contrast using a standard luminance-based ratio and compares it to common accessibility guidance levels.
| Metric | Value |
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Privacy: contrast calculation runs locally in your browser. No values are stored or transmitted.
How it works
Pick a foreground and background color, preview them together, and review the contrast ratio plus accessibility-style pass indicators.
Examples
- Check whether body text is readable on a light background
- Compare dark and light UI combinations quickly
- Test brand colors against accessibility thresholds
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What does this contrast checker do?
It calculates the contrast ratio between a text color and a background color and compares the result with common WCAG thresholds.
- Does it show AA and AAA guidance?
Yes. The tool indicates whether the current contrast passes common normal-text and large-text thresholds.
- Can I preview the combination live?
Yes. The tool includes a live preview using your selected foreground and background colors.
- Is any color data stored?
No. Everything runs locally in your browser and no values are stored or transmitted.