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Color Theory for Developers: HEX, RGB, and HSL Explained

Colors are fundamental to web design. Understanding different formats helps you work efficiently and communicate with designers.

HEX Colors

Most common in CSS. Uses hexadecimal: #RRGGBB

Example: #667eea = Red:102, Green:126, Blue:234

When to use: CSS, HTML, most web contexts

RGB Colors

Additive model: rgb(red, green, blue) where each is 0-255

Example: rgb(102, 126, 234)

RGBA adds alpha: rgba(102, 126, 234, 0.5) for 50% opacity

When to use: JavaScript manipulation, transparency

HSL Colors

Human-friendly: hsl(hue, saturation%, lightness%)

• Hue: 0-360 degrees on color wheel
• Saturation: 0% (gray) to 100% (full color)
• Lightness: 0% (black) to 100% (white)

When to use: Creating variations, accessibility

🎨 Convert Colors Now →

Choosing the Right Format

• HEX: Compact, designer-friendly
• RGB: JavaScript calculations
• HSL: Creating shades/tints

Accessibility

Ensure sufficient contrast:

• Normal text: 4.5:1 minimum
• Large text: 3:1 minimum

Our Color Picker converts between all formats with live preview.

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