Color Converter

Convert between HEX, RGB, and HSL color formats with live preview.

Understanding Color Models

Digital colors are represented using mathematical models that define how colors are stored and displayed. The three most common models in web development are HEX, RGB, and HSL. Each model describes the same set of colors but uses different parameters, making some models more intuitive for certain tasks. HEX is the most compact notation, RGB maps directly to how screens produce color, and HSL aligns with how humans naturally perceive and describe color relationships.

HEX (Hexadecimal) colors use a six-character code preceded by a hash symbol, such as #2563EB. Each pair of characters represents the Red, Green, and Blue channels respectively, with values ranging from 00 (0) to FF (255). HEX is the most widely used color format in CSS and HTML because of its compactness. The shorthand notation (e.g., #FFF for #FFFFFF) is available when both characters in each pair are identical.

RGB (Red, Green, Blue) defines colors by specifying the intensity of each primary color channel as a value between 0 and 255. The notation rgb(37, 99, 235) tells the browser to mix those specific intensities of red, green, and blue light. This additive color model directly corresponds to how LCD and LED displays work: each pixel contains red, green, and blue sub-pixels whose brightness levels combine to produce the perceived color.

HSL (Hue, Saturation, Lightness) describes colors in terms that humans find intuitive. Hue is the color angle on the color wheel (0-360 degrees), where 0 is red, 120 is green, and 240 is blue. Saturation controls how vivid or muted the color appears (0% is grayscale, 100% is fully saturated). Lightness controls how bright or dark the color is (0% is black, 100% is white, 50% is the pure color). HSL makes it easy to create color variations: you can lighten a color by increasing lightness or create a muted version by reducing saturation.

When to Use Each Format

  • HEX for CSS: Most common in stylesheets because it is compact. Works everywhere in CSS properties like color, background-color, and border-color.
  • RGB for Transparency: Use rgba() when you need alpha transparency. Example: rgba(37, 99, 235, 0.5) for 50% opacity.
  • HSL for Design Systems: Ideal for creating consistent color palettes. Adjust lightness to create shades and tints without changing the base hue.
  • HEX in Design Tools: Figma, Sketch, and Adobe tools use HEX as the default color input format, making it the standard for design-to-code handoff.

CSS Color Tips

  • CSS Custom Properties: Define colors as --primary: #2563eb; and reference them with var(--primary) for easy theme management.
  • Modern CSS Color: CSS Color Level 4 supports oklch() and oklab() for perceptually uniform color spaces.
  • Contrast Ratios: WCAG 2.1 requires a minimum 4.5:1 contrast ratio for normal text. Use tools to verify your color combinations.
  • Dark Mode: Use HSL to create dark mode palettes by reducing lightness values while keeping hue and saturation consistent.

Frequently Asked Questions

What is the difference between HEX and RGB?

HEX and RGB represent the exact same colors using different notation. HEX uses base-16 (hexadecimal) numbers in a compact 6-character string, while RGB uses decimal values from 0-255 for each channel. #FF0000 and rgb(255, 0, 0) are identical (pure red). Choose HEX for brevity in stylesheets or RGB when you need alpha transparency via rgba().

Why is HSL useful for designers?

HSL separates color identity (hue) from its visual properties (saturation and lightness). This makes it intuitive to create variations: want a darker shade? Reduce lightness. Want a muted version? Lower saturation. With HEX or RGB, achieving the same effect requires changing multiple values simultaneously, which is less predictable.

Are all colors available in all three formats?

Yes. HEX, RGB, and HSL can all represent the full sRGB color space of approximately 16.7 million colors (256 x 256 x 256). Every color expressible in one format has an exact equivalent in the other two formats. Our converter performs lossless mathematical transformations between them.

Is my data processed on a server?

No. All color conversions happen entirely in your browser using JavaScript. No color values are sent to any server, stored, or logged. The tool works completely offline once the page is loaded, making it safe to use with proprietary brand colors or design tokens.