Contrast Checker is a free, browser-based colour and CSS design tool. Check if your text and background color combination passes WCAG 2.1 AA and AAA accessibility standards.
UI/UX designers, front-end developers, and graphic designers use Contrast Checker every day to save time and skip the overhead of desktop software or paid services. No installation, no account, and no technical knowledge required — just paste your content into Contrast Checker and get results in seconds. Your files never leave your browser — full privacy by design.
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How to use Contrast Checker
1
Pick colors
Select your text and background colors.
2
Check contrast
See the contrast ratio and WCAG grades.
3
Adjust
Tweak until you pass AA or AAA.
Use Cases
- Quick one-off conversions without installing software
- Batch processing multiple items to save time
- Demonstrating concepts in teaching and learning contexts
- Cross-platform compatibility conversions and format standardisation
Key Benefits
- 100% free with no usage limits, watermarks, or hidden fees
- No account or sign-up required — use it instantly
- Works in all modern browsers on desktop, tablet, and mobile
- Privacy-first: all processing runs locally, files never leave your device
- Actionable insights with clear, readable output
- Detailed breakdown with specific recommendations