WCAG Contrast Checker
Check color contrast ratios for WCAG accessibility compliance
What is WCAG Contrast Checker?
WCAG Contrast Checker evaluates the contrast ratio between foreground and background colors against Web Content Accessibility Guidelines (WCAG) 2.1 standards for web accessibility compliance.
When to use this tool
- Checking if your color choices meet accessibility standards
- Testing text readability against backgrounds
- Ensuring compliance with ADA/Section 508 requirements
- Designing inclusive user interfaces
How it works
Calculates the relative luminance of both colors using the WCAG formula, then computes the contrast ratio. Compares against WCAG AA (4.5:1 for normal text, 3:1 for large text) and AAA (7:1 for normal text, 4.5:1 for large text) thresholds.
Security Guidelines
- WCAG AA is the minimum legal requirement for most websites
- WCAG AAA is recommended but not legally required
- Large text (18pt+ or 14pt+ bold) has lower contrast requirements
About WCAG Contrast Checker
Check color contrast ratios for WCAG accessibility compliance It runs entirely in your browser — no files are uploaded to any server, ensuring complete privacy and instant results.
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Last updated: 2025-01-15
FAQ
Check color contrast ratios for WCAG accessibility compliance
Yes, completely free. No signup required.
Yes. Runs entirely in your browser, no files uploaded.
Yes, works on any device with a modern browser.
No, everything runs in your browser.