hex#6366F1
rgbrgb(99, 102, 241)
hslhsl(239, 84%, 67%)
hsvhsv(239, 59%, 95%)
cmykcmyk(59%, 58%, 0%, 5%)
oklchoklch(58.54% 0.2 277.12deg)
How to use
01
Paste a hex or RGB color
The input field accepts either #RRGGBB or rgb(r, g, b), as the placeholder shows. It opens with #6366F1 loaded, so you can watch the four ink percentages react as you type your own color.
02
Sanity-check the preview
The swatch below the input renders your color in screen RGB. Remember it's a screen approximation; the printed result depends on ink, paper, and press, which no browser preview can fully promise.
03
Copy the ink percentages
Find the highlighted CMYK row in the results grid and click its copy button. You'll get a string like cmyk(0%, 81%, 81%, 16%) listing cyan, magenta, yellow, and key in order.
Why CMYK Converter
- Convert any color to CMYK for print design.
- Get the percentage values for cyan, magenta, yellow, key (black).
- Same panel shows HEX, RGB, HSL, HSV, OKLCH for web-print bridging.
Common questions
What does the K in CMYK stand for?
K is key, meaning black ink. Printers add it because mixing cyan, magenta, and yellow at full strength produces a muddy brown rather than true black, and because one black plate is cheaper and sharper than three overlapping inks.
How does the rgb to cmyk converter calculate its percentages?
It uses the standard formula: K is 1 minus the largest RGB channel, then each ink is derived from what remains. For #D62828 the red channel of 214 sets K at 16 percent, with magenta and yellow both landing at 81 percent.
Will these CMYK numbers match what my print shop produces?
Treat them as a starting point, not gospel. This is a device-independent formula with no ICC profile, while real presses depend on ink brand, paper stock, and calibration. For color-critical jobs, ask the shop for a physical proof.
Can this tool convert cmyk to rgb directly?
The input field only parses hex and rgb() strings, so you can't paste cmyk() values here. To go from cmyk to rgb by hand, invert the formula: each RGB channel is 255 times (1 minus the ink) times (1 minus K).
Why do bright blues and greens lose punch in CMYK?
Ink on paper reflects light instead of emitting it, so the CMYK gamut is smaller than sRGB. Saturated blues, electric greens, and neon shades sit outside what ink can reproduce, and the press substitutes the nearest duller color.
Is a CMYK value of 0%, 0%, 0%, 100% the same as rich black?
No. Plain 100 percent K prints a flat, slightly gray black, while rich black layers other inks underneath, something like 60-40-40-100, for a deeper tone on large areas. Small text should stay plain K to avoid registration fringing.