Color Swatch Card Generator

Generate printable color swatch cards with HEX, RGB, CMYK values for physical reference.

Tested tool guide Tested browser tools Checked August 16, 2026

What Color Swatch Card Generator does, with a checked example

Turn specified colors into swatch cards intended for printing and physical reference. Each card combines a visible color sample with its HEX, RGB, and CMYK coordinates, making it easier to identify a color away from the original design file. The important caveat is that matching numbers do not guarantee matching appearance. HEX and RGB describe screen-oriented color, while printed color depends on the printer, ink, paper, calibration, and the color profile used during production.

Worked example

A concrete input and expected output from the current implementation.

Input

#FF0000

Expected output

A red swatch card labeled HEX #FF0000, RGB 255, 0, 0, and CMYK 0%, 100%, 100%, 0%.

#FF0000 assigns the maximum 8-bit value to red and zero to green and blue. Its direct process-color conversion uses full magenta and yellow with no cyan or black.

How the result is produced

Card contents

A selected color becomes a card containing a filled swatch and labels for the same color in HEX, RGB, and CMYK notation. HEX expresses three 8-bit RGB channels as hexadecimal pairs, while RGB shows their decimal values. The CMYK line provides a percentage-based print-oriented representation for the card.

Print interpretation

The generated card places numeric identification beside the rendered sample so it can serve as a compact physical reference. Printing converts the displayed color through the settings and capabilities of the output device. The printed patch should therefore be treated as a result from that particular printer and material, not as a universal physical realization of the listed values.

Good uses

Prepare labeled swatches for reviewing brand colors during an in-person meeting where the original design application is unavailable.
Create a desk or studio reference that lets designers compare a printed patch with its HEX, RGB, and CMYK labels.
Print a small set of candidate colors before choosing which values to place in a style guide or production brief.

Limits and checks

CMYK is device-dependent, so the listed percentages can identify a conversion but cannot predict an exact printed appearance on every press, printer, ink set, or paper.
A screen preview and a printed swatch may differ because monitors emit light while paper reflects it. Display brightness and calibration can exaggerate the difference.
The printed card is not automatically a calibrated proof. Printer-driver adjustments, color profiles, scaling, paper tint, and ink limits can change the resulting patch.

Common questions

Will the printed swatch exactly match the HEX color on my monitor?

Usually no. HEX identifies an RGB color, but monitors and printers reproduce color differently. Monitor calibration, printer profiles, ink, paper, lighting, and print settings all affect appearance. The card is useful as a labeled reference, but exact production matching requires a controlled color-management and proofing process.

Can I give the displayed CMYK percentages directly to a commercial printer?

You can use them as a starting reference, but they may not be the final production values. A printer may require conversion for a specific press condition, substrate, and CMYK profile. Ask the print provider which profile or supplied-color format they expect before treating the card's CMYK line as production-ready.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.