What WCAG Color Contrast Checker does
Calculate text contrast and evaluate common WCAG AA and AAA thresholds. The tool keeps the operation focused and creates a separate result so the original remains available for comparison.
WCAG Color Contrast Checker processes the supplied input in the browser unless its interface explicitly identifies a browser-managed service.
How to use WCAG Color Contrast Checker
A quick trial makes WCAG Color Contrast Checker easier to verify: provide a typical input, use conservative settings, then inspect the complete output in its target application.
- Enter or select the source colors, typography, dimensions, or CSS values used by the real design.
- Adjust one option at a time while watching the preview and the generated values.
- Copy the result into a representative component that includes realistic content and interactive states.
- Review contrast, responsiveness, browser behavior, and design-token compatibility before committing the change.
Where WCAG Color Contrast Checker fits
Use this design workflow to create values that can be tested in a real interface, stylesheet, or brand system. Copy the output into representative components and review normal, hover, focus, disabled, light, dark, and responsive states before treating it as production-ready.
What to check
Check the actual foreground, background, text size, state, and surrounding interface. A simulation or threshold is one accessibility signal, not a complete usability test.
Test copied CSS in the real design system and review contrast at each text size and state. Simulations and numeric thresholds are useful checks, but they do not replace testing with people and assistive technology.
Privacy and limitations
Color and CSS generation runs entirely in the browser.
Generated CSS and color calculations cannot account for every display, browser, font, surrounding color, visual condition, or design-system rule. Accessibility thresholds and simulations are useful checks, not guarantees that a finished experience is understandable or usable.