WCAG 2.1 Accessibility

Color Contrast Checker

Verify legibility between text and background colors according to Web Content Accessibility Guidelines (WCAG 2.1) standards.

20.4 : 1 Superb Contrast

Normal Text

16px body copy
AA (4.5:1) PASS
AAA (7.0:1) PASS

Large Text

18pt+ or 14pt+ bold
AA (3.0:1) PASS
AAA (4.5:1) PASS

UI Components

Borders, icons, buttons
AA (3.0:1) PASS
Large Headline Text (24px Bold)
Subheading Sample (18px Semi-bold)

Accurate contrast ratios are essential for digital legibility. People reading screens in bright ambient lighting, users with low vision, and people experiencing age-related contrast sensitivity loss depend on sufficient luminosity separation between text and background surfaces.

Outline Badge

Accessibility Scope Notice: This tool calculates color contrast according to WCAG 2.1 relative luminance formulas. High color contrast is vital, but complete website accessibility also requires semantic markup, keyboard accessibility, logical focus order, and screen reader compatibility.