Color Contrast Checker: Ensure Your Design Is Accessible to Everyone

September 5, 2026 · 4 min read

Approximately 1 in 12 men and 1 in 200 women have some form of color vision deficiency. Low contrast text is unreadable for people with low vision, and uncomfortable for everyone else. Accessibility is not a niche concern — it is good design that serves all users better.

WCAG Contrast Standards

WCAG Level AA (minimum) requires a contrast ratio of 4.5:1 for normal text (under 18px) and 3:1 for large text (18px+ or 14px+ bold). Level AAA (enhanced) requires 7:1 for normal text and 4.5:1 for large text. Most websites should aim for AA compliance at minimum. Government and education sites often require AAA.

Common Failures

Light gray text on white backgrounds is the most common accessibility failure. Trendy low-contrast designs (light text on pastel backgrounds) look aesthetic but fail users with any vision impairment. Placeholder text in form fields is often too low contrast. Colored text on colored backgrounds frequently fails — always check the math.

How to Check Contrast

Enter your text color and background color (in HEX or RGB) into a contrast checker. The tool calculates the ratio and reports pass or fail for AA and AAA standards. If your combination fails, adjust the darker color to be darker or the lighter color to be lighter until the ratio meets the threshold.

Practical Tips

Black text on white has a 21:1 ratio (maximum contrast). Dark gray (#333) on white has 12.6:1 (excellent). For colored text, check contrast against both light and dark backgrounds. For interactive elements (buttons, links), contrast requirements apply to both the default and hover states. Test with users who have vision impairments when possible.

Try It Now

Our free Hex to RGB Converter handles this instantly — no signup, no limits.

Also useful: our Color Palette Generator for related calculations.