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CMYK ↔ RGB Converter
One colour per line. cmyk(c%, m%, y%, k%) → rgb(r, g, b) and back, using the plain conversion (R = 255 × (1−C) × (1−K)); percentages rounded to whole numbers. No ICC profile — it says so — so this is the naïve print-preview conversion, not a press-accurate one.
A little guidance. A better result.
How to use CMYK ↔ RGB Converter
cmyk(c%, m%, y%, k%) ↔ rgb(r, g, b), one per line — the naïve conversion, no ICC profile, and it says so.
Prepare your input
Enter CMYK percentages or RGB channels.
Use the workspace
Review the converted values.
Check your result
Compare colours in the workflow that will use them.
Know the limits
This uses a simple mathematical conversion without ICC profiles; it is not a print-colour proof.
Where does my input go?
This browser tool processes your input on your device. Optional analytics is a separate choice; it is not needed to use the tool. Keep your original until you have checked the result.
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