Hex Color Code
A color notation using six hexadecimal digits to represent RGB channel values, prefixed with #. The standard color format in web development.
A hex color code expresses RGB values as three pairs of hexadecimal digits in the format #RRGGBB, where each pair ranges from 00 to FF (0-255 in decimal). Pure red is #FF0000, white is #FFFFFF, and black is #000000.
CSS supports a 3-digit shorthand (#RGB) where #F00 equals #FF0000. The 8-digit form (#RRGGBBAA) adds alpha transparency: #FF000080 represents red at 50% opacity. This compact notation is machine-friendly and has become the de facto web standard.
While not as intuitive as HSV for human perception, hex codes are universally supported across browsers, design tools, and programming languages. The color picker tool instantly converts any sampled color to its hex representation.