https://checker.free/en/contrast/
Check color contrast ratios online for free with the Color Contrast Checker from Checker.Free. Test foreground and background colors against WCAG 2.1 and WCAG 2.2 accessibility standards, calculate contrast ratios, and improve text readability and UI accessibility.
The tool calculates the contrast ratio between text, icons, interface elements, and background colors using relative luminance. Results range from 1:1 for identical colors to 21:1 for maximum contrast.
You can verify whether color combinations meet WCAG Level AA and AAA requirements. The checker evaluates normal text, large text, user interface components, graphical objects, borders, focus indicators, and other important accessibility elements.
It is also useful for testing brand palettes, UI color systems, dark mode and light mode combinations, muted text, links, buttons, borders, and other interface states. The tool helps identify color combinations that may be difficult to read and provides guidance for creating more accessible designs.
Advanced accessibility analysis includes APCA contrast scoring, color blindness considerations, semi-transparent colors, gradients, background images, and automatic color adjustments for combinations that fail required contrast thresholds. APCA is provided as an additional perceptual model and is not an official WCAG 2.2 conformance standard.
The tool is designed for web designers, developers, accessibility specialists, UI/UX professionals, brand designers, and anyone who wants to create more readable and accessible websites and digital interfaces.
