Flag Color-Spec Reference
Enter a hex color to see its RGB and CMYK values side by side, plus the closest match among a small set of common flag hues.
Color specification
Reference flag colors
How the conversion works
Hex and RGB both describe color additively, by mixing red, green, and blue light. CMYK works the opposite way, subtracting cyan, magenta, and yellow ink from a white surface, with a separate black (K) channel doing the heavy lifting for shadow and depth. The standard conversion pulls out the black key first — k = 1 − max(r, g, b) — then scales the remaining channels against it, so pure white converts to 0,0,0,0 and pure black to 0,0,0,100.
The reference swatches below are a small, deliberately generic set of flag-design hues — a flag red, a flag blue, a flag green, and so on — useful for comparing a custom color against a conventional starting point, not tied to any one flag or country.
Frequently Asked Questions
Why do I need CMYK if I already have a hex code?
Hex and RGB describe color as emitted light — how it looks on a screen. Printing and embroidery build color from layered ink or thread instead, using the subtractive cyan/magenta/yellow/black (CMYK) model. A flag maker's spec sheet or a print shop's proof will usually ask for CMYK, not hex, so converting one to the other is a routine step in getting a physical flag made.
Will the printed or stitched flag match the screen color exactly?
Not perfectly. CMYK covers a smaller range of color than RGB, fabric dye and thread behave differently from ink on paper, and every printer and embroidery machine is calibrated slightly differently. Treat the CMYK figure as a strong starting point and always check a physical proof before a full production run.
Is there an official hex code for a flag's colors?
Rarely. Most flag specifications historically describe color by name or by textile dye reference, not by hex or Pantone, and many national style guides leave the exact shade to the manufacturer. The hex values here are a practical, common digital approximation for design work, not a claimed legal standard.
What does the "nearest flag color" match tell me?
It reports which of a small set of common flag hues (a saturated red, blue, green, gold, and so on) your color is closest to in straight-line RGB distance — useful for sanity-checking a custom color or for picking a conventional starting hue before you fine-tune it.
Educational tool only. Color-space math is exact, but there is no single official shade for most flag colors — always confirm against a physical proof or your manufacturer's swatch book before a production run.