Color Contrast Checker — WCAG Compliance
Check color contrast ratios for WCAG 2.1 accessibility compliance. Test text and background color combinations for AA and AAA standards.
Contrast Ratio
21.00:1
Large Text Preview (24px bold)
Normal text preview (16px). The quick brown fox jumps over the lazy dog. This sample text helps you evaluate readability with your chosen color combination.
Small text preview (14px). Check if this is still readable for your users.
AA Normal Text
Requires 4.5:1
AA Large Text
Requires 3:1
AAA Normal Text
Requires 7:1
AAA Large Text
Requires 4.5:1
About This Tool
The Color Contrast Checker is a free online tool available on CodeUtilo. Check WCAG 2.1 color contrast ratios. Validate AA and AAA accessibility standards. All processing happens directly in your browser — no data is ever sent to any server, ensuring your privacy and security. No signup or installation is required.
Key Features
- Browser-Based Processing — All color contrast checker operations run locally in your browser using JavaScript. Your data never leaves your device.
- Instant Results — Get results immediately as you type or paste your input. No waiting for server responses or page reloads.
- Free & No Signup — Use the color contrast checker as many times as you need without creating an account or paying anything.
- Mobile Friendly — Works on desktop, tablet, and mobile browsers. Access this tool from any device with an internet connection.
Common Use Cases
- Using the color contrast checker for day-to-day development tasks
- Saving time on repetitive tasks by using a browser-based tool instead of writing custom code
- Working on projects where installing software is not an option (school, work, shared computers)
- Quick prototyping and debugging without switching to a terminal or IDE
- Sharing the tool link with colleagues who need the same functionality
How to Use
Enter your input in the text area provided and the color contrast checker will process it instantly. Use the Copy button to copy the result to your clipboard. All operations are performed locally in your browser — no data is transmitted to any server.
Frequently Asked Questions
Is the Color Contrast Checker free to use?
Yes, the Color Contrast Checker is completely free with no usage limits. There is no signup or registration required. You can use it as many times as you need.
Is my data safe when using this tool?
Yes. All processing happens locally in your browser using JavaScript. Your data is never uploaded to any server or stored anywhere. Everything stays on your device.
Does this tool work on mobile devices?
Yes. The Color Contrast Checker is fully responsive and works on smartphones, tablets, and desktop computers. You can use it from any modern browser on any device.
Do I need to install anything?
No. The Color Contrast Checker runs entirely in your web browser. There is nothing to download or install. Just open the page and start using it immediately.
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Before This Tool