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WCAG Contrast Checker

Check foreground and background contrast ratios against WCAG AA and AAA thresholds.

Private-first · runs on your device Ready
Readable text previewThe quick brown fox jumps over the lazy dog.
13.19:1WCAG contrast ratio
PassAA normal text
PassAA large text
PassAAA normal text
PassAAA large text

WCAG thresholds shown here are contrast checks only; accessibility also depends on font size, weight, states, focus, motion and other design choices.

How it works

WCAG Contrast Checker is designed to give you the result immediately. The calculation or processing happens on your device for this tool, so normal use does not require an account or a file upload.

Privacy

This tool is marked offline-capable. Your inputs are used in the current browser/app session and are not required to be sent to Wiunix Tools to perform the operation.

Check WCAG text contrast ratios

Compare a foreground and background color using the WCAG relative-luminance contrast formula and see AA/AAA threshold results for normal and large text.

Contrast is one accessibility factor; the tool does not claim that a design is fully accessible based on color contrast alone.

  • WCAG contrast ratio
  • AA normal / large text
  • AAA normal / large text
  • Live visual preview