RGB to CMYK Converter

About This Tool

This tool converts RGB color values to CMYK percentages for print-ready workflows. It accepts standard RGB inputs (0–255 per channel) and can parse a hex color string when provided. Intended users include designers, prepress operators, and developers who need reliable, repeatable color conversions for proofs, press sheets, and production assets. Outputs are CMYK percentages suitable for copying into design software, proofs, or vendor specifications, helping ensure consistent color language across teams and vendors in multi-step print pipelines.
Conceptually, the conversion uses the conventional sRGB to CMYK model. RGB values are normalized to 0–1; K is computed as 1 minus the maximum of R', G', and B'. If K equals 1, C, M, and Y are zero. Otherwise, C = (1 − R' − K) / (1 − K), M = (1 − G' − K) / (1 − K), and Y = (1 − B' − K) / (1 − K). The tool reports each component as a percentage with two-decimal precision, clamped to 0–100%.
Use cases include translating web colors for proofs, validating color accuracy across devices, and populating PDFs and print-ready assets with deterministic CMYK values. By providing a neutral, device-agnostic baseline, the converter supports consistent color communication between designers, printers, and vendors. It helps reduce guesswork and manual math in color workflows, improves yield in proofs, and accelerates handoffs between teams that rely on a shared CMYK reference.

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