RGB to CMYK
← Color converterPaste an RGB triple and read the same color as four ink percentages. This is the plain formula: black is the shortfall of the strongest channel, and cyan, magenta and yellow are the shortfall of each channel after black. It matches what most design tools show as CMYK, and it is not a press profile.
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How to convert RGB to CMYK
- Type the red, green and blue values into the RGB field, as 59, 130, 246 or as rgb(59 130 246).
- Read the CMYK field. Click Copy to put the four percentages on the clipboard.
- Type CMYK percentages to go the other way. The RGB and HEX fields follow.
FAQ
- Will the printed color match my screen?
- Not exactly. A screen mixes light and a press mixes ink, and the sRGB gamut and a press gamut do not cover each other. Pure #0000ff, for example, has no ink equivalent. Treat these percentages as a starting point and check a proof.
- Which CMYK formula is this?
- The plain one: K = 1 − max(R, G, B), then C = (1 − R − K) ÷ (1 − K), and the same for M and Y. Adobe products use an ICC profile such as U.S. Web Coated (SWOP) instead, so their numbers differ by a few percent.
- Does the CMYK field accept values without percent signs?
- Yes. Numbers from 0 to 1 are read as fractions and numbers above 1 as percentages, so 0.76, 0.47, 0, 0.04 and 76, 47, 0, 4 give the same color.
- Does this store or send my colors anywhere?
- No. The conversion runs in your browser and makes no network requests.
