KKitForma.alpha

Language

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WORKS IN YOUR BROWSER

Color Contrast Checker

Calculate the WCAG contrast ratio between two opaque sRGB colors.

Free. No account needed.

Inputs are processed on your device. Check results before using them.

Result

Enter your values. Your result will appear here.

How it works

  1. Enter foreground and background colors.
  2. Read the ratio and threshold results for normal text, large text, and non-text elements.

Example & practical use

#000000 on #ffffff → 21:1

What to know

Uses WCAG relative luminance thresholds: AA normal 4.5:1, AAA normal 7:1, AA large/non-text 3:1, AAA large 4.5:1. Large text is at least 18 pt or bold 14 pt. Opacity, gradients, and context are not evaluated.

Are my files or inputs uploaded?

Image and text processing happens in your browser. Your files are not uploaded to our servers.

Found an issue?

We are improving this alpha release. Tell us the tool, your device and the expected result through the contact page. You do not need to share private inputs or original files. Contact

A few more useful tools

QR code generator

Make a downloadable QR code for a link or text.

JSON Formatter

Validate JSON and format it with consistent indentation.

JSON Minifier

Validate JSON and remove unnecessary formatting whitespace.

CSV to JSON

Convert a header-based CSV table into an array of JSON objects.