Color Contrast Checker
Check WCAG contrast ratios for text and background colors.
How to use this Color Contrast Checker
- Enter or paste the requested values in the tool.
- Select the appropriate calculation or conversion option when available.
- Click the action button to view the result and supporting details.
Color Contrast Checker formula
Contrast ratio = (lighter relative luminance + 0.05) ÷ (darker relative luminance + 0.05).
This free tool provides an immediate estimate. Review the entered values and independently verify any result used for an important financial, medical, tax, or business decision.
Frequently asked questions
What does the Color Contrast Checker do?
Check WCAG contrast ratios for text and background colors.
Is the Color Contrast Checker free?
Yes. This calculator is free to use and does not require an account.
Are my values stored?
No calculator values are intentionally stored in a database. Results are generated for the current request.
Can I use the color contrast checker result for official decisions?
Use the result as an estimate and verify important financial, medical, tax, or legal decisions with a qualified professional.