色彩对比度检查器
检查颜色对比度以符合WCAG无障碍标准。测试前景和背景颜色的AA和AAA标准。
Aa
The quick brown fox jumps over the lazy dog
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor.
WCAG无障碍指南
AA Normal (4.5:1): 普通文本的最低对比度要求。适用于大多数网页内容。
AA Large (3:1): 大号文本的最低对比度（18pt+或14pt+粗体）。
AAA Normal (7:1): 普通文本的增强对比度。最高无障碍标准。
AAA Large (4.5:1): 大号文本的增强对比度。建议用于重要内容。
预设
历史记录
WCAG无障碍指南
色彩对比度检查器帮助您确保网站符合WCAG无障碍标准。
🔥 热门工具
ℹ️ 关于 色彩对比度检查器
The Color Contrast Checker is a free developer tool built for speed and privacy. Check color contrast ratio for WCAG accessibility compliance. Test foreground and background colors for AA and AAA standards. Every operation runs entirely in your browser, which means your code, text, or payload is never uploaded to a server. Paste your input, hit the button, and get the output — formatted, validated, or transformed — in milliseconds. This Color Contrast Checker is designed to replace slow, bloated web apps with a single focused page that loads fast, works offline after first visit, and handles both small snippets and large inputs gracefully.
💡 使用场景
💎 专业提示
- Paste your content directly — the Color Contrast Checker detects common input patterns and applies sensible defaults automatically.
- Use keyboard shortcuts (Ctrl/Cmd+A to select all, Ctrl/Cmd+C to copy) to speed up your workflow inside the Color Contrast Checker.
- For very large inputs, break them into chunks — most browser tabs can handle megabytes of text, but parsing huge payloads may freeze the UI briefly.
- The Color Contrast Checker does not log or store your input. If you need history, copy important outputs to a local file or note app.
- Combine the Color Contrast Checker with other tools on this site (formatters, converters, encoders) to build complete data pipelines without leaving your browser.
❓ 常见问题解答
Yes, fully free with no signup, no API key, no watermarks, and no usage limits.
No. The Color Contrast Checker runs entirely client-side in your browser. Your input never touches our servers.
There is no hard limit, but expect slowdowns on inputs larger than a few megabytes, depending on your device's memory.
Yes. Outputs generated with the Color Contrast Checker are yours to use freely in any personal or commercial project.
Most of the logic runs in client-side JavaScript, so after the initial load you can often keep working without a network connection.
None. Because the Color Contrast Checker runs in your browser, you can process as many inputs as your hardware allows without API keys or throttling.