Color Contrast Checker
Check WCAG contrast with editable HEX colors, font size and weight, AA/AAA results, swap controls, live UI preview and nearest passing text-color suggestions.
What the Color Contrast Checker does
Check WCAG contrast with editable HEX colors, font size and weight, AA/AAA results, swap controls, live UI preview and nearest passing text-color suggestions.
Calculate the contrast ratio between two colours and compare it with common WCAG text thresholds.
Color Contrast Checker input, output and processing
The Color Contrast Checker is built around the exact task described above. Check these details before starting so the source and expected result match your workflow.
- Input
- Contrast
- Result
- Ratio
- Processing
- Calculates or transforms the supplied values locally in the browser.
- Best for
- Development, debugging and data preparation followed by project-level validation.
When to use the Color Contrast Checker
- Check text/background colour combinations.
- Compare alternative brand colours for readability.
- Catch obvious contrast problems during UI design.
How to use the Color Contrast Checker
- 1Enter the source code, text or values requested by the developer utility.
- 2Run Color Contrast Checker and inspect the generated or parsed result.
- 3Copy the result and test or validate it in the real destination environment before production use.
Detailed guide to the Color Contrast Checker
The Color Contrast Checker provides a focused way to validate, test and diagnose. It supports a common practical need: Check text/background colour combinations. You can complete that task without setting up a larger application or unrelated workflow.
Choose the right input for Color Contrast Checker
Start with contrast and make sure it represents the final material you intend to process. Read the labels before changing defaults: the useful option is the one that matches the destination requirement, not automatically the largest, smallest or strongest setting. Test the exact foreground and background colours used in the interface.
Color Contrast Checker workflow in practice
A practical workflow is to prepare the source, run one controlled operation, inspect the preview or summary, and then save ratio. This supports tasks such as: Check text/background colour combinations. Compare alternative brand colours for readability.
Understand and verify the checker result
Do not treat a completed status as the only quality check. Open or copy ratio, compare the important information with the source, and test it in the destination that will use it. Use representative input, include edge cases, and validate the result in the language, runtime or project that will consume it before production deployment.
Troubleshoot the Color Contrast Checker
First confirm that the selected source is supported and complete. Then retry with a smaller representative sample or the default options, review any message shown by the tool, and compare the result again. For the Color Contrast Checker, Check normal and large-text thresholds separately.
Tips for the best Color Contrast Checker result
- Test the exact foreground and background colours used in the interface.
- Check normal and large-text thresholds separately.
- Review focus states, icons and non-text components as part of a broader accessibility audit.
A practical Color Contrast Checker workflow
Use the Color Contrast Checker for its focused task, review every relevant option before processing and verify the ratio against the contrast before relying on it.
- Start with representative input rather than the only copy of important data.
- Review the visible result, warnings and selected options before copying or downloading it.
- Verify important output independently when it will affect publishing, finance, health, security or another high-impact decision.
Color Contrast Checker frequently asked questions
Is this Color Contrast Checker free to use?
Yes. The Color Contrast Checker is free to use and does not require registration or software installation.
Is my information or file kept private?
Yes. The entered content is not sent to this website by this tool.
Does this tool work on mobile devices?
Yes. The tool has a responsive interface and works in current mobile and desktop browsers with JavaScript enabled.
Should I test generated or minified code before publishing it?
Yes. Review and test the result in your own development environment. Browser utilities are convenient for everyday work but do not replace a project-aware compiler, linter, validator or security review.
What do the contrast results mean?
The checker compares two colours and reports their contrast ratio against common WCAG text thresholds. Passing one threshold does not automatically make the entire interface accessible.