Color Contrast Checker
Color Contrast Checker 是一款實用的網頁工具，不需安裝即可快速完成工作。大多數處理都在瀏覽器中完成，不會隱藏上傳。
WCAG AA for normal text requires 4.5:1. AAA for normal text requires 7:1.
使用方式
輸入 Color Contrast Checker 所需資料，調整選項並執行工具。複製或下載前請先確認結果。
範例
可用於內容準備、素材檢查、片段驗證與可重複的製作流程。 Validate foreground and background color pairs against WCAG AA and AAA thresholds.
比較
The live preview, ratio, and pass/fail cards make accessibility decisions visible at a glance. OneClickSite keeps input, settings, preview, and saving steps in one predictable workflow.
何時使用
Use it before shipping buttons, cards, labels, hero text, and dashboard status colors.
提示
請保留原始檔案或文字，直到確認輸出結果。
FAQ
What ratio should normal text pass?
WCAG AA normal text needs at least 4.5:1; AAA normal text needs at least 7:1.
我的資料會上傳到伺服器嗎？
不會。此工具在瀏覽器中執行。
Can I use this for commercial work?
Yes. Review the output and keep your source files so you can compare results before publishing.
Does it work on mobile?
Yes. Inputs, controls, and result panels are designed for mobile and desktop use.