There are color pickers and converters available. Why is hex coding used rather of numbers? Because if you utilized numbers, every red, green, or blue value ranging from 0 to 255 may represent one, two, or three different digits. The code might consist of as little as three numbers or as much as nine digits. This may confuse not just the systems reading the codes, but also the individuals doing the coding. Having each value be six symbols, regardless of value, decreases the potential for errors when the code is generated on your behalf.