About WCAG Color Contrast & Accessibility Checker
Ensure your website and app colors meet international web accessibility standards (WCAG 2.1). Computes relative luminance and contrast ratio (e.g. 7.5:1) with live previews and color swap.
Key Capabilities & Features
- Calculates exact W3C relative luminance contrast ratio
- Pass/Fail badges for WCAG AA Normal, AA Large, AAA Normal, AAA Large, and UI Graphics
- Live interactive UI card preview with buttons and text
- 1-Click foreground and background color swap
- Quick accessible brand palette presets
How to Use WCAG Color Contrast & Accessibility Checker
1
Pick Foreground & Background
Choose text color and background color using color pickers or hex codes.
2
Review Contrast Ratio
Inspect the calculated ratio (e.g. 8.4:1) and WCAG compliance badges.
3
Test in Live Preview
Verify typography readability on the live UI preview card.
Privacy & In-Browser Execution Guarantee
Calculated instantly in-browser using official W3C color accessibility math.
Frequently Asked Questions
What contrast ratio is required for WCAG AA?
WCAG AA requires at least 4.5:1 for normal body text and at least 3.0:1 for large text (18pt / 24px or bold 14pt / 18.5px) and active UI components.
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