Kastavo

RGB ↔ CMYK Converter

Convert three RGB values to CMYK, or four CMYK values to RGB, in either direction.

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How it works

All processing happens locally, in your browser. No color is ever sent to a server. RGB is the model used by screens (light: red, green, blue). CMYK is the model used by printing (ink: cyan, magenta, yellow, and black). This conversion uses the standard RGB↔CMYK formula — useful as a reference before printing, but the exact printed color also depends on the printer, the paper, and the color profile used.

Frequently asked questions

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