HEX, RGB, and HSL: Understanding Web Color Formats

HEX — The Designer's Default

HEX (hexadecimal) is the most common color format in web design. A HEX color looks like #FF5733: a hash followed by six characters. Each pair of characters (FF, 57, 33) represents the red, green, and blue channel respectively, in base 16 (0–FF, or 0–255 in decimal).

HEX is compact, copy-paste friendly, and accepted by every browser, CSS preprocessor, Figma, Adobe XD, and design tool. It is the de-facto standard for brand color palettes and design systems.

RGB — Precise Channel Control

RGB expresses color as three decimal numbers (0–255) for red, green, and blue. The CSS function looks like rgb(255, 87, 51). When you need transparency, use rgba(255, 87, 51, 0.5) where the fourth value is opacity from 0 (invisible) to 1 (opaque).

RGB is also the native format for working with colors in JavaScript Canvas, SVG filters, and image processing. If you are generating colors programmatically or animating them, RGB is often the most convenient.

HSL — Human-Friendly Color Thinking

HSL stands for Hue, Saturation, Lightness. It maps more closely to how humans think about color. The hue is a degree on the color wheel (0–360), saturation is the intensity (0% = grey, 100% = vivid), and lightness is the brightness (0% = black, 100% = white, 50% = full color).

The power of HSL becomes obvious when you need to create color variations programmatically. To make a color lighter, just increase the lightness:

Quick Comparison

Convert Between Formats Instantly

You can convert between HEX, RGB, and HSL without any math using these free tools:

• HEX to RGB — paste a HEX code, get RGB values instantly.
• RGB to HEX — enter R, G, B values and get the HEX code.
• HEX to HSL — useful when moving from a design file to CSS custom properties.