Color Contrast Checker – WCAG Contrast Ratio

Color Contrast Checker: Guide and Best Practices

Check the contrast ratio between text and background colors and see whether the combination meets WCAG AA or AAA guidance. This tool is intended for common web, design and accessibility workflows. Use the controls above to process an image or compare colors, then review the result before using it in a live project.

How to get a useful result

Choose a suitable source file or enter valid color values. Keep the original asset so you can return to it if the result is not suitable. Preview the output at the size and context where it will appear. Image dimensions, file format, quality and background colors can all affect the final appearance.

Privacy and compatibility

Image processing is performed locally in the browser using standard browser capabilities. Very large images may require more memory and take longer to process. Browser support and output quality can vary, so test the downloaded file in your target application. Do not use a compressed or cropped image as your only copy of an important original.

Frequently asked questions

Does this upload my image? No, the tool uses browser-side processing. Is the output always smaller or better? Not necessarily; the best settings depend on the source and intended use. Should I check the result? Yes. Preview it and confirm that quality, dimensions and accessibility requirements are appropriate.