// Design / Accessibility
Color Contrast Checker online
WCAG contrast ratio checker - AA and AAA accessibility compliance
by
CHUNKY
MUNSTER
MUNSTER
Color Contrast Checker (WCAG Compliance) ensures your digital content is readable for all users, including those with visual impairments. This free online color contrast tool validates your foreground and background pairs against official W3C standards. By maintaining a high aa aaa compliance score, you improve the overall user experience and meet legal web accessibility checker requirements.
The wcag accessibility tool uses relative luminance to determine the legibility of text. For standard body text, a ratio of 4.5:1 is required for Level AA, while Level AAA demands a stricter 7:1 ratio. This accessible color combinations validator also provides a lower 3:1 threshold for large text and decorative elements. Use these aa aaa compliance results to refine your brand palette for maximum inclusivity.
4.5:1 for normal text (below 18pt regular weight or 14pt bold), and 3:1 for large text, essential UI components, and logotype text.
Luminance-based contrast ratio does not directly model colour blindness. However, sufficient luminance contrast ensures readability across most types of colour vision deficiency, since it does not rely on hue alone. Use a colour blindness simulator to verify specific colour combinations.
Options: darken the background colour, use a drop shadow on the text, increase font size (to use the lower large-text threshold), or switch to dark text. The suggestions panel shows the nearest passing shade of your background colour.
AAA requires 7:1 contrast for normal text and 4.5:1 for large text. It is the strictest level, aimed at users with severe visual impairments. Many design systems target AA; AAA is recommended but not always achievable within brand guidelines.
Whether you're designing a new app or auditing an existing site, this utility simplifies compliance. For more design options, see also the Color Converter and Colour Name Finder. Bookmark this color contrast checker for a fast, free online WCAG accessibility tool whenever you need to check your ratios.