Developer
Color Contrast Checker
- Browser-based
- No signup
Enter foreground and background hex colors to compute contrast ratio and AA/AAA results for normal and large text.
100% Client-Side
Your data never leaves your computer.
How to use this tool
1. Paste or type input into the Color Contrast Checker editor. 2. Adjust format, mode, or option controls if shown. 3. Review live output or validation messages from Color Contrast Checker. 4. Fix any reported errors. 5. Copy the result when it looks correct. Processing runs in your browser; inputs are not uploaded to our server.
Worked example
Example: paste a small sample input into Color Contrast Checker, run the transform or validation, and compare the output with the before text—fix any syntax errors reported before copying.
How it works
Enter foreground and background HEX colors to calculate the WCAG contrast ratio and see AA/AAA pass or fail for normal and large text. Evaluation runs in your browser.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
Which standard is used?
Contrast ratios follow WCAG relative luminance guidance for AA and AAA thresholds.
Is the Color Contrast Checker free to use?
Yes. Utilnivo tools are free to use and do not require an account.
Are my inputs stored?
Utilnivo does not require an account. See the privacy note on this page for how your data is processed for this tool.
How do I get started with Color Contrast Checker?
Open the tool on this page, enter your inputs, and use the on-screen controls. No account is required.
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