Color Converter
Convert colors between HEX, RGB, and HSL formats instantly.
Color Formats: HEX, RGB, and HSL explained
In web development, colors are represented in multiple formats, each with specific advantages. Understanding when to use each format improves both the readability of your code and the visual experience of the end user. The three main formats are HEX (hexadecimal), RGB (Red, Green, Blue), and HSL (Hue, Saturation, Lightness).
HEX is the most compact and popular format in CSS, representing colors with 6 hexadecimal digits (#RRGGBB). RGB defines colors by the intensity of red, green, and blue light (0-255 per channel). HSL is the most human-intuitive, defining colors by their hue (0-360°), saturation (0-100%), and lightness (0-100%), making it easy to create variations of a base color.
Practical use cases
CSS variables: Use HSL in CSS variables to create dynamic palettes. Changing the lightness of a base color is as simple as modifying a single value: hsl(220, 80%, 50%) for the main color and hsl(220, 80%, 70%) for a light variant.
Accessible design: The HSL format makes it easy to check contrast between colors. The lightness (L) directly tells you how light or dark a color is, helping you meet WCAG accessibility guidelines.
Dynamic themes: With HSL you can automatically generate light and dark themes by adjusting only the lightness, keeping the same hue and saturation for visual consistency.
Frequently asked questions
Which format is best for CSS?
HEX for static colors (most compact and universally supported). HSL for dynamic colors and CSS variables (more intuitive for creating variations). RGB when you need transparency with rgba(). Modern browsers support all formats.
What is the alpha channel (transparency)?
The alpha channel defines the opacity of a color (0 = transparent, 1 = opaque). In HEX it's added as #RRGGBBAA, in RGB as rgba(r,g,b,a), and in HSL as hsla(h,s%,l%,a). Modern CSS allows using the syntax rgb(r g b / 0.5) without commas.
How many colors can each format represent?
6-digit HEX and RGB can represent 16,777,216 colors (256^3). 3-digit HEX (#RGB) represents 4,096 colors. HSL can theoretically represent infinite colors, but in practice it rounds to the same 16.7 million.
What are web-safe colors?
The 216 web-safe colors were important for 256-color monitors in the 1990s. Today, with screens displaying millions of colors, they are no longer relevant. Use any color you need without worrying about the web-safe palette.
Quick conversion between formats
| Color | HEX | RGB | HSL |
|---|---|---|---|
| Red | #FF0000 | 255, 0, 0 | 0°, 100%, 50% |
| Green | #00FF00 | 0, 255, 0 | 120°, 100%, 50% |
| Blue | #0000FF | 0, 0, 255 | 240°, 100%, 50% |
| Black | #000000 | 0, 0, 0 | 0°, 0%, 0% |