ColorIndicator Tools
Color Contrast Checker - WCAG AA/AAA Accessibility Test
This WCAG contrast checker tests foreground and background combinations with instant ratios and pass/fail badges. It is built for accessible UI and brand systems.
Check contrast early, fix issues fast, and keep every text style readable across screens and lighting conditions.
Contrast preview
The quick brown fox jumps over the lazy dog.
Suggested text color: #0A0A0A
Contrast ratio
16.96:1
WCAG AA
WCAG AAA
What is contrast ratio?
Contrast ratio measures the difference in luminance between two colors. Higher ratios improve readability, especially for body text and critical UI controls.
Accessible contrast is not just compliance; it improves usability for everyone, including users in bright environments or with low vision.
WCAG AA vs AAA standards
WCAG AA requires at least 4.5:1 for normal text and 3:1 for large text. AAA raises the bar to 7:1 for normal text and 4.5:1 for large text.
Aim for AA as a baseline, then improve high-traffic screens toward AAA where possible.
How to improve color accessibility
If a pair fails, darken the text, increase background lightness, or boost contrast for primary actions. Avoid low-contrast text on near-white surfaces.
Use consistent contrast tokens for buttons, links, and body text to reduce regression risk.
Best text colors for light backgrounds
For pale backgrounds, deep charcoal or navy text provides clarity without the harshness of pure black. Reserve pure black for dense editorial content.
Contrast for buttons and UI states
Hover, focus, and disabled states must still pass contrast checks. Test every state to avoid invisible buttons or unclear feedback.
Explore related resources
FAQ
What contrast ratio should I target for UI?
Aim for WCAG AA at minimum: 4.5:1 for body text and 3:1 for large text.
Does this tool show pass or fail?
Yes. You will see pass/fail badges for AA and AAA standards.
Can I test light and dark mode combinations?
Absolutely. Swap foreground and background values to evaluate both themes.
Is contrast required for icons and UI elements?
Yes. Icons and interactive elements should also meet contrast thresholds for clarity.
Should I rely on color alone for status?
No. Pair color with icons or labels so users who cannot perceive color still understand the state.