RGB to CMYK

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Convert RGB color values to CMYK percentages.

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About RGB to CMYK

Convert RGB (Red, Green, Blue) values to CMYK (Cyan, Magenta, Yellow, Key/Black) percentages. Enter values as rgb(R, G, B) or plain R, G, B. One color per line for batch conversion.

How to use

  1. Enter one RGB color per line (e.g. rgb(255, 87, 51) or 255, 87, 51).
  2. The CMYK equivalent appears instantly in the output panel.
  3. Click Copy to copy the results to your clipboard.

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Frequently Asked Questions

FAQs about RGB to CMYK

What input formats are accepted?

This tool accepts rgb(R, G, B) format as well as plain comma-separated values like 255, 87, 51.

How is RGB converted to CMYK?

Each RGB component (0–255) is normalized to 0–1. The K (black) channel is 1 - max(R', G', B'). C, M, Y are then derived from the normalized values adjusted by K.

Will the output values be exact?

The output is a mathematical approximation. Professional print workflows require ICC color profiles for precise color matching.

Can I convert multiple colors at once?

Yes. Enter one RGB color per line for batch conversion.

What is rgb(0, 0, 0) in CMYK?

rgb(0, 0, 0) = cmyk(0%, 0%, 0%, 100%) — pure black in CMYK.