WCAG-compliant contrast ratio calculator for accessibility
Developer Tools
About This Tool
Color Contrast Ratio Checker calculates the contrast ratio between foreground and background colors and checks compliance with WCAG AA and AAA standards for both normal and large text. It features color pickers, hex input, live preview, and one-click color swapping.
Key Features
- Real-time contrast ratio calculation as you pick colors
- WCAG AA and AAA compliance checks for normal and large text
- Color picker and hex input for precise color selection
- Live text preview with selected foreground and background
- One-click swap foreground and background colors
- All processing runs locally in your browser
Use Cases
- Verify text readability on websites for accessibility compliance
- Design accessible color schemes for UI components
- Audit existing designs against WCAG guidelines
- Test color combinations for data visualizations and charts
- Ensure presentation slides meet accessibility standards
color
contrast
accessibility
wcag
Frequently Asked Questions
What is the Color Contrast Ratio Checker?
The Color Contrast Ratio Checker is an online tool that calculates the contrast ratio between two colors and checks WCAG AA and AAA compliance for both normal and large text.
What WCAG levels does it check?
The tool checks four WCAG compliance levels: Normal Text AA (≥ 4.5:1), Large Text AA (≥ 3.0:1), Normal Text AAA (≥ 7.0:1), and Large Text AAA (≥ 4.5:1). Each level shows a clear pass or fail result.
How do I use the contrast checker?
Simply select or enter two hex color values for foreground and background. The tool instantly calculates the contrast ratio and displays WCAG compliance badges. You can also swap the two colors with one click.
Is my data safe when using this tool?
Absolutely. All processing happens locally in your browser. No data is uploaded to any server, ensuring your information remains completely private and secure.
Can I use this tool on my phone?
Yes, the Color Contrast Ratio Checker is fully responsive and works on all devices including smartphones, tablets, and desktop computers.