跳转到正文
AA

Contrast Checker

前景・背景のWCAGコントラスト比を判定。

The quick brown fox jumps over the lazy dog.

いろはにほへと ちりぬるを わかよたれそ つねならむ

Large heading sample

14.63:1

Contrast ratio (WCAG)

WCAG AA
Normal ✓Large ✓
WCAG AAA
Normal ✓Large ✓

关于Contrast Checker

A contrast checker computes luminance contrast between text and background against WCAG AA/AAA thresholds. toco.tools shows ratio and pass/fail badges for normal and large text entirely in the browser. Passing ratios are not the whole story—also verify with real devices and diverse vision needs.

使用方法

  1. Enter foreground and background
  2. Check ratio and WCAG badges
  3. Adjust colors and recheck

常见问题

What is a contrast checker?

A tool that measures text/background contrast against WCAG AA/AAA.

AA vs AAA?

AAA is stricter; thresholds also differ for normal vs large text.

Is uploaded data sent externally?

No. All processing runs in your browser; nothing is sent to toco.tools servers.