WCAG Color Contrast Checker
Check color contrast ratios against WCAG 2.1 accessibility benchmarks. Instant Level AA and AAA validation with live interactive previews.
Color Inputs
Enter HEX colors or select via native color picker
Outstanding Contrast (AAA)
WCAG 2.1 requires a minimum ratio of 4.5:1 for normal body text and 3:1 for large text (18pt / 24px) or UI components.
Live Rendering Preview
How to Use WCAG Color Contrast Checker
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Choose foreground and background colors
Enter HEX color values or click the color swatches to launch your browser’s visual color picker.
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Inspect WCAG contrast score
The tool immediately computes the exact mathematical contrast ratio from 1:1 up to 21:1.
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Check AA & AAA compliance
Review green PASS or red FAIL badges for normal text (under 18pt), large text, and interactive UI components.
High-Contrast Text Example
Text: #1A1A2E | Background: #FFFFFF17.22:1 Ratio — PASS Level AAA (Normal & Large Text)Exceptional readability suitable for all display conditions.
Technical Specifications
- Supported Inputs: HEX (#RRGGBB), RGB (Red, Green, Blue), Web Color Pickers
- Input Limit: Unlimited client-side computation
- Processing Engine: 100% In-Browser (WCAG 2.1 Relative Luminance Algorithm)
- Content Uploads: None (Your files and text are processed locally on your device with zero uploads)
Privacy & Security Guarantee
Your color hex values are processed entirely in your web browser's memory using native client-side web technologies. Unlike traditional cloud tools, your content is never uploaded to remote servers, stored on external disks, or analyzed by third parties.
2ClickKit In-Browser vs Traditional Cloud Tools
| Feature | 2ClickKit (In-Browser) | Traditional Cloud Services |
|---|---|---|
| Data Privacy | Files never leave your local device | Uploaded to remote servers and third-party clouds |
| Processing Speed | Instant local execution (0ms upload time) | Constrained by internet upload & server processing queues |
| Account & Costs | 100% Free with zero registration or paywalls | Tiered subscriptions, limits, or forced sign-ups |
Best Practices & Tips
- Use the "Swap Colors" button to quickly test reverse button and badge treatments.
- If your ratio is between 3.0:1 and 4.4:1, consider increasing font weight or size to meet the Large Text AA threshold.
Frequently Asked Questions
What is WCAG 2.1 color contrast compliance?
The Web Content Accessibility Guidelines (WCAG) define minimum contrast ratios between text and its background so people with visual impairments or color blindness can read text comfortably.
What is the difference between Level AA and Level AAA?
Level AA is the standard legal baseline for web accessibility: 4.5:1 for normal text and 3:1 for large text. Level AAA is the highest standard: 7:1 for normal text and 4.5:1 for large text.
What counts as "Large Text"?
WCAG defines large text as at least 18pt (24px) regular weight, or at least 14pt (approx. 18.66px) bold weight.
Are my brand colors sent to any server?
No! All relative luminance calculations happen locally in your web browser. 0 bytes are uploaded.