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WCAG Contrast Ratio Checker

Accessibility • 100% Client-Side Processing

Professional WCAG 2.1/2.2 accessibility contrast checker. Calculates exact luminance ratios (e.g. 4.5:1, 7:1) between text and background colors with pass/fail badges.

Privacy First: WCAG Contrast Ratio Checker executes 100% locally in your web browser. No inputs or generated outputs leave your device.
Foreground (Text)
Background

DevUtility Accessible Design

This sample text demonstrates foreground color against background color readability under WCAG 2.1/2.2 guidelines.

Contrast Ratio
17.85:1
Normal Text
AAA Pass
Large Text
AAA Pass
UI Elements
AA Pass

Tool Chaining — Continue Workflow

Take your result from WCAG Contrast Ratio Checker directly into companion utilities:

Color Blindness SimulatorColor Space Converter & PickerHarmonious Color Palette Generator

How to Use

  1. Select or enter Foreground (Text) color.
  2. Select or enter Background color.
  3. Review the Contrast Ratio (e.g. 8.42:1) and AA/AAA Pass/Fail badges.
  4. Inspect live preview text rendering.

Key Features

  • •WCAG 2.1 & 2.2 compliant
  • •Checks Normal Text (4.5:1), Large Text (3:1), and AAA (7:1)
  • •Interactive live text preview
  • •Swap colors button

Technical Scope & Limitations

  • • Evaluates solid colors; semi-transparent overlays must be composited first.