What is Contrast Ratio Checker?
Contrast Ratio Checker is a free online tool that check WCAG contrast ratio between two colors. Designers, developers and creators use it to pick perfect colors for websites and graphics. It works entirely in your browser — there is nothing to download, no account to create, and no usage limits. Your data stays on your device, which makes it both fast and private.
Whether you need it once or use it every day, contrast ratio checker gives you instant results with a single click. It is part of KamiWeb's collection of Color Tools — all free forever.
How to use Contrast Ratio Checker
Using the contrast ratio checker could not be simpler. Follow these steps:
- Enter your input in the contrast ratio checker box above.
- Click the "Submit" button.
- Get instant results — copy them or download where available.
- No signup, no waiting, no catch. Use it as many times as you like.
Why use KamiWeb's Contrast Ratio Checker?
- 100% free forever — no hidden charges, no premium tier, no credits.
- Private by design — everything runs in your browser; nothing is uploaded to any server.
- No signup needed — open the page and start using it immediately.
- Works on all devices — mobile, tablet and desktop, with a responsive layout.
- Fast results — optimized code means answers in milliseconds, not seconds.
Tips for best results
- Test colors on both light and dark backgrounds before finalizing.
- Check contrast ratios for text to keep your site accessible.
- Save your favorite palettes for brand consistency.
Pro tip: combine contrast ratio checker with our color picker & converter for even better results. Many users also find the color palette generator helpful for related tasks.
Frequently asked questions
Is Contrast Ratio Checker really free?
Yes. The contrast ratio checker is completely free with no limits on usage. KamiWeb keeps all tools free forever — no account, no subscription, no catch.
Do I need to install anything?
No. The contrast ratio checker runs entirely in your web browser using JavaScript. It works on Chrome, Firefox, Safari and Edge on any device.
Is my data safe?
Yes. Everything is processed locally in your browser. Your input is never sent to KamiWeb servers or any third party, so you can safely use it for sensitive content.
Can I use it on mobile?
Absolutely. The contrast ratio checker is fully responsive and works smoothly on phones and tablets, with touch-friendly controls.
Related Color Tools
Try these other free color tools from KamiWeb: