RGB to Hex is a free online color-conversion tool that turns RGB values (0–255 per channel) into the hexadecimal color code CSS and design tools actually expect, along with the equivalent HSL representation and a live swatch preview. Drag three sliders or type exact channel numbers and every output format updates together, so you always have HEX, HSL, and CSS rgb() available at once instead of running the conversion three separate times.
RGB and hex describe the exact same color space — they are not different colors, just different notations for the same three-channel data. RGB expresses each channel as a base-10 number from 0 to 255, which is how color pickers, image editors like Photoshop and GIMP, and canvas/WebGL code typically report values. Hex expresses the same three numbers in base-16, two digits per channel, packed into a single six-character string prefixed with #. The conversion is pure arithmetic — each 0–255 channel value becomes a two-digit hexadecimal pair — but doing that math by hand for anything other than a handful of round numbers (0, 255, 128) is error-prone and slow, especially when you are translating a color sampled from a screenshot, a brand guideline PDF listing RGB triplets, or a data visualization library that only accepts RGB arrays.
HSL (hue, saturation, lightness) is included alongside because it describes color in a way that is often more intuitive to adjust than either RGB or hex: hue is the position on the color wheel (0–360°), saturation is how vivid versus gray the color is, and lightness is how close to black or white it is. If you need to programmatically generate a set of related colors — five shades of the same hue at different lightness levels, for instance — HSL makes that trivial in a way RGB and hex do not, since you only need to vary one number.
This tool is aimed at the everyday translation work of frontend development and design handoff: converting a color a designer specified in RGB (common when sampled directly from an image or design tool color picker) into the hex notation used throughout a CSS codebase, verifying that a brand color guide's RGB and hex values actually match, or getting an HSL equivalent to build a lighter or darker variant of an existing brand color. Everything computes locally in JavaScript with no network round-trip, so results are instantaneous.
Starting from a hex code instead? HEX to RGB converts the other direction.
