PTFormat JSON
Validate and format JSON.
Open tool ↗Developer tools / FREE TOOL
Color contrast checker
Calculate text and background contrast against WCAG AA and AAA thresholds.
WORKSPACE Processed on your device
No account neededNo file uploadsNo automatic watermark
QUICK GUIDE
How to use color contrast checker
Calculate text and background contrast against WCAG AA and AAA thresholds.
- Fill in the fields or choose a file on your device.
- Adjust the options and run the tool.
- Review the preview or result, then copy or download it.
Frequently asked questions
Do I need an account?
No. This tool is free without an account.
Is my content uploaded?
No. This tool processes content in your browser. Downloads you save remain on your device.
What are the limits?
WCAG 2 calculation for opaque colors. Does not automatically audit an entire page, image backgrounds or all accessibility criteria.
Something did not work as expected? Let us know
Describe the issue. Do not include files, passwords or personal text. The tool will be identified automatically.