Every color you see on screen is just a set of numbers. But different systems use different numbers to describe the same color. Understanding these systems — called color spaces — is essential for any designer or developer working with color.
HEX — The Web Standard
HEX codes like #FF6B35 are the most familiar format for web colors. They pack Red, Green, and Blue values into a 6-character string.
- Format:
#RRGGBB(each pair is 00–FF) - Best for: CSS, design specifications, quick sharing
- Limitation: Hard to adjust programmatically — changing brightness means doing math on all three channels
.button {
background-color: #FF6B35;
color: #ffffff;
}
RGB — Red, Green, Blue
RGB is the foundation. Every screen pixel mixes red, green, and blue light. Values range from 0–255 per channel.
- Format:
rgb(255, 107, 53) - Best for: When you need to manipulate channels individually
- Tip: CSS also supports
rgba()for adding transparency
HSL — Hue, Saturation, Lightness
HSL maps color to human perception. Instead of mixing light channels, you describe:
- Hue: The color angle on the color wheel (0–360°)
- Saturation: How vivid the color is (0–100%)
- Lightness: How bright or dark (0–100%)
This makes HSL the best choice for programmatic color manipulation:
/* Easy to create hover states */
.button { background: hsl(20, 100%, 60%); }
.button:hover { background: hsl(20, 100%, 55%); } /* just darken 5% */
OKLCH — The Future
OKLCH is a perceptually uniform color space. "Perceptually uniform" means equal numeric changes produce equal visual changes — unlike HSL where hsl(120, 100%, 50%) and hsl(60, 100%, 50%) look very different in brightness.
- L: Lightness (0–1, perceptually linear)
- C: Chroma (0–0.4, how colorful)
- H: Hue (0–360°, evenly distributed)
.accent { color: oklch(70% 0.2 30); }
OKLCH is already supported in all modern browsers and is the recommended color space in CSS Color Level 4.
When to Use What
| Color Space | Best For | |---|---| | HEX | Quick sharing, design specs | | RGB | Channel manipulation, Canvas API | | HSL | UI themes, dynamic color generation | | CMYK | Print design | | OKLCH | Perceptually uniform palettes, accessibility |
Try It with LangColor
You can convert between all these color spaces instantly with the Color Converter tool. Or use the AI Palette Generator to create harmonious palettes in any format.
Want to dive deeper? Check out our Contrast Checker to ensure your color choices meet WCAG accessibility standards.