Test the contrast ratio between a text and background colour and see whether it passes WCAG AA and AAA accessibility standards for normal and large text — with a live preview.
Test the contrast ratio between a text and background colour and see whether it passes WCAG AA and AAA accessibility standards for normal and large text — with a live preview.
The Color Contrast Checker is part of TechToolsCenter — a free, privacy-first collection of 65+ online tools. Like every tool here, it runs 100% in your browser, so your data stays private and results are instant. There is no sign-up, no watermark and no limit on how many times you can use it.
Open the Color Contrast Checker — it loads instantly and works entirely in your browser. No sign-up or installation is needed.
Fill in the fields or paste your content. Everything updates in real time so you always see an accurate live preview.
Check the result in the preview panel. Use Undo, Redo or Reset at any time — your work is saved to your browser automatically.
When you're happy, copy the result, download the file, or share it. Nothing is ever uploaded to a server — it all stays on your device.
WCAG AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1 and 4.5:1 respectively.