RGB to CMYK Color Converter

Convert RGB screen colors to CMYK print values with live preview.

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How it works

K = 1 − max(R,G,B); C = (1−R−K)/(1−K) and the same for M and Y — the standard RGB to print CMYK formula.

Examples

InputOutput
rgb(255,128,0)cmyk(0%, 50%, 100%, 0%)
rgb(0,0,0)cmyk(0%, 0%, 0%, 100%)
rgb(255,255,255)cmyk(0%, 0%, 0%, 0%)

Frequently Asked Questions

Is RGB to CMYK conversion exact?

No — it is a mathematical approximation. For print production, always check a Pantone or physical proof, because monitors show a wider gamut than printers can reproduce.

What does 100% K mean?

Pure black: no cyan, magenta or yellow ink, only the black (key) plate.

Where is CMYK used?

Offset printing, business cards, brochures, packaging — anywhere ink meets paper.

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