Convert print CMYK percentages to RGB / HEX and back both ways. CMYK ↔ RGB Converter is a free online tool from the ToolsRift Color Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Cyan, Magenta, Yellow and Key (black) — the subtractive color model used by printers, expressed as 0–100% ink coverage.
This uses the standard mathematical conversion. True print color also depends on ICC profiles and paper, so treat it as a close approximation.
CMYK has a smaller gamut and the rounding to whole percentages loses a little precision, so round-trips can differ by a point or two.