RGB to CMYK Converter

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RGB Input

CMYK Output

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Convert screen-based RGB colors to CMYK values for print references. This tool maps standard rgb() inputs into the four-channel cmyk() format.

Input formats

Provide colors using the standard rgb(r, g, b) syntax with channel values ranging from 0 to 255. The tool will parse the input and extract the individual red, green, and blue components.

CMYK percentage output

The output is returned in the cmyk(c%, m%, y%, k%) format. Each channel represents a percentage from 0% to 100% for cyan, magenta, yellow, and key (black). This mapping provides a mathematical approximation rather than an ICC-managed profile conversion.

Batch processing

Convert multiple RGB values simultaneously by pasting them into the input pane, one per line. The output pane generates a corresponding list of CMYK values.

Visual adjustments

Use the active color picker to visually tweak the currently selected line. Adjusting the picker automatically recalculates the RGB input and instantly updates the CMYK output.

Frequently Asked Questions

What RGB format does it accept?

CSS rgb() strings like rgb(34, 211, 238), with channels from 0 to 255. Paste one color per line for batch conversion.

What CMYK format do I get?

cmyk(c%, m%, y%, k%), where each component runs from 0% to 100%. Example: cmyk(86%, 11%, 0%, 7%).

Will this match my printer exactly?

No. This is a standard arithmetic conversion, not a color-managed one. It does not use an ICC profile, so treat it as an approximation. For accurate print color, convert through your print provider's profile.

Why can't CMYK reproduce some bright screen colors?

CMYK ink has a smaller gamut than an sRGB screen, so vivid blues and greens get clipped to the nearest printable color when converted for real output.

Are my colors uploaded?

No.