Color Contrast Checker – Free Online Tool
Check foreground and background color contrast for WCAG AA and AAA, with live preview, CSS output, and readable results.
Free WCAG Color Contrast Checker
The Color Contrast Checker calculates the contrast ratio between text and background colors and shows WCAG AA and AAA pass/fail results. Use it for websites, apps, buttons, forms, dashboards, documents, and brand palettes.
Why Contrast Matters
Low contrast makes text hard to read, especially for users with low vision, older screens, bright sunlight, or tired eyes. Better contrast improves accessibility, usability, and conversion because people can actually read the interface.
Best Design Workflow
Use the Color Contrast Checker when building design systems, landing pages, buttons, cards, and charts. Pair it with the Color Palette Generator for palette work and the Meta Tag Generator for launch polish.
Private, Instant Accessibility Checks
Color contrast math runs entirely in your browser. No design tokens, brand colors, or draft palettes are uploaded to ToolsMint.
How to Use Color Contrast Checker
- 1
Choose foreground and background colors or paste hex values
- 2
Review the contrast ratio and WCAG pass/fail cards
- 3
Preview real UI text, swap colors if needed, and copy the CSS
Frequently Asked Questions
Everything you need to know about the Color Contrast Checker.
Is this color contrast checker free?
Yes. It is free with no signup.
What contrast ratio passes WCAG AA?
Normal text needs 4.5:1 for AA. Large text needs 3:1 for AA.
What contrast ratio passes WCAG AAA?
Normal text needs 7:1 for AAA. Large text needs 4.5:1 for AAA.
Can I copy the CSS?
Yes. The tool generates copy-ready color and background-color CSS.
Does this replace a full accessibility audit?
No. It checks color contrast only. A full audit should also review keyboard access, labels, focus states, semantics, and user flows.
Are my brand colors uploaded?
No. The contrast calculation happens locally in your browser.