Color Contrast Checker
WCAG contrast checks plus simple palette shades from a base hex.
Interactive controls load with JavaScript. Processing stays in your browser.
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How to use
- 输入前景与背景 HEX/颜色，查看对比度与 AA/AAA 是否通过。
- 大文本与正常文本阈值分别显示。
- 可基于基准色生成明暗色板便于挑选。
- 格式互转请用「颜色格式转换」。
FAQ
Does Color Contrast Checker upload my data?
No. Color Contrast Checker runs locally in your browser and does not upload content to www.518882.com or third-party APIs.
Do I need an account?
No. Open and use — no signup, login, or paywall. Open Color Contrast Checker and use it — no signup, login, or paywall.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing — suited to private text and drafts.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page. There is no account quota.