Free Contrast Ratio Checker — WCAG Accessibility
Initializing tool...
More Utilities
Related Tools
Ubify Intelligence Team
EDITORIAL TEAM
About This Tool
The Contrast Ratio Checker calculates the contrast ratio between any foreground and background color — and tells you whether the combination passes WCAG 2.1 AA (4.5:1) and AAA (7:1) standards for both normal and large text. Enter hex codes and see your accessibility score instantly. Free, no account, runs in browser.
How to Use
- 1
Set your foreground (text) color and background color using hex codes or the pickers.
- 2
The contrast ratio appears with pass/fail status for WCAG AA and AAA.
- 3
Adjust colors until you reach a passing ratio for your target standard.
Frequently Asked Questions
What is the minimum contrast ratio for WCAG AA compliance?
WCAG AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold).
Why does contrast ratio matter for accessibility?
Sufficient contrast ensures text is readable for users with low vision or color blindness — it is a legal requirement in many jurisdictions under accessibility laws.
Is this contrast checker free?
Yes. Completely free with no account required.