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HEX vs RGB vs HSL Color Formats

Understand the differences between color formats and when to use each in your CSS.

By 📅 Updated ⏱ 5 min read
⚡ Key Takeaways (TL;DR)

HEX (#RRGGBB) is compact, best for static colors. RGB (0-255 per channel) is best for JavaScript/canvas. HSL (hue 0-360°, saturation %, lightness %) is the most intuitive — easiest to create shade variations. Use HSLA/RGBA when you need transparency. HSL is recommended for CSS design systems.

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HEX Colors

Format: #RRGGBB (e.g., #c41e1e). The most common CSS format. Compact but hard to modify mentally. Shorthand available: #RGB expands to #RRGGBB.

RGB Colors

Format: rgb(196, 30, 30). Defines red, green, blue channels (0-255). More readable than HEX. RGBA adds alpha transparency: rgba(196, 30, 30, 0.8).

HSL Colors

Format: hsl(0, 73%, 44%). Defines hue (0-360°), saturation (0-100%), lightness (0-100%). The most intuitive format — easy to create variations by adjusting one value.

Which Should You Use?

  • HEX for static colors and design hand-offs
  • RGB for JavaScript manipulation and canvas
  • HSL for CSS design systems and dynamic theming
  • HSLA/RGBA when you need transparency

Frequently Asked Questions

Can I mix color formats in CSS?

Yes. Browsers handle all formats. But pick one for consistency. HSL is best for design systems because you can easily create shades.

Which format do design tools use?

Figma and Sketch default to HEX. Photoshop uses RGB. CSS-focused designers increasingly prefer HSL.

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