HEX vs RGB vs HSL — What's the Difference?

Introduction

If you have written CSS, you have almost certainly used #ff6600, rgb(255, 102, 0), or hsl(30, 100%, 50%). These three color formats — HEX, RGB, and HSL — are the primary ways to represent colors on the web. While they can all describe the same colors, each format has distinct advantages depending on the task at hand.

Understanding the differences between these formats is essential for working efficiently with color in web design and development. This guide explains how each format works, when to use it, and how to convert between them. Use our Color Converter to experiment with all three formats in real time.

HEX — The Web Standard

HEX (hexadecimal) notation is the most widely used color format on the web. A HEX code consists of a hash symbol (#) followed by six hexadecimal digits (0–9 and A–F). The six digits are split into three pairs: the first pair represents red, the second green, and the third blue.

For example, #FF6600 breaks down as: red = FF (255 in decimal), green = 66 (102 in decimal), blue = 00 (0 in decimal). Each pair can range from 00 (0) to FF (255), giving 256 possible values per channel and over 16 million total colors.

HEX also supports a shorthand notation for colors where each pair consists of the same digit: #FF6600 can be shortened to #F60. Shorthand only works when each channel has repeating digits. For alpha transparency, HEX uses an 8-digit notation (#FF660080 for 50% opacity), though this is less commonly used than the rgba() function.

HEX is compact, easy to copy from design tools, and universally supported in every browser and CSS framework. It is the default output of most color pickers and design software, making it the most common format for sharing colors between designers and developers.

RGB — The Display Standard

RGB (Red, Green, Blue) is the color model that computer monitors, phone screens, and televisions use to display colors. Each pixel on a screen is made up of red, green, and blue subpixels at varying intensities. In CSS, the rgb() function takes three values between 0 and 255, or percentages (0% to 100%).

The same orange as before is written as rgb(255, 102, 0) or rgb(100%, 40%, 0%). The first number controls red intensity, the second green, and the third blue. Unlike HEX, RGB values are decimal, which makes them more intuitive if you think in terms of 0-to-255 scales.

For transparency, CSS provides rgba(), which adds a fourth alpha parameter: rgba(255, 102, 0, 0.5) applies 50% opacity. The modern CSS Color Level 4 specification also allows the alpha channel inside rgb() directly: rgb(255 102 0 / 0.5).

RGB is ideal when you need fine control over individual color channels — for example, when programmatically adjusting brightness or creating color variations based on numeric calculations. It is the standard format for canvas, WebGL, and image processing in JavaScript.

HSL — The Human-Friendly Format

HSL (Hue, Saturation, Lightness) represents colors in a way that aligns more closely with how humans think about color. Instead of describing how much red, green, and blue a color contains, HSL describes what kind of color it is (hue), how vivid it is (saturation), and how light or dark it is (lightness).

Hue is an angle on the color wheel from 0 to 360 degrees. 0° is red, 120° is green, 240° is blue, and 360° brings you back to red. Saturation is a percentage: 0% is gray (no color), 100% is the purest version of that hue. Lightness is also a percentage: 0% is black, 50% is the pure color, and 100% is white.

Our orange example is hsl(30, 100%, 50%): hue 30° (orange on the wheel), 100% saturation (fully vivid), 50% lightness (mid-tone). To make it lighter, increase lightness: hsl(30, 100%, 70%). To make it less vivid, reduce saturation: hsl(30, 50%, 50%).

HSL is the most intuitive format for manually creating color schemes. If you have a base hue and want an analogous palette, just add or subtract 30 degrees. For a complementary color, add or subtract 180 degrees. This makes HSL the preferred format for designers who adjust colors by feel rather than by channel values.

When to Use Each Format

Choosing the right format depends on your context and workflow:

• Use HEX when copying colors directly from design tools (Figma, Sketch, Adobe XD), writing static CSS, or sharing colors with other developers. HEX is the most compact format and the universal standard for color values in code.
• Use RGB when working with Canvas, WebGL, or image data in JavaScript, or when you need to programmatically manipulate individual color channels. RGB is the native format for screen rendering and image processing.
• Use HSL when manually creating color palettes, adjusting perceived brightness, or building design systems where you need consistent saturation across different hues. HSL makes it easy to create lighter and darker variants of the same color.

In practice, most projects use a mix of all three. You might define brand colors in HEX in your CSS custom properties, use HSL in JavaScript for dynamic color generation, and use RGB when working with canvas. Use our Color Converter to switch between formats instantly.

Browser Support

All three formats — HEX, RGB, and HSL — have full browser support across every modern browser, including Chrome, Firefox, Safari, and Edge. There are no compatibility concerns when choosing between them. Internet Explorer also supports all three formats for basic color values.

The modern rgb() and hsl() syntax (space-separated values with optional alpha) is supported in all current browsers. However, if you need to support older versions, the comma-separated rgb(), rgba(), hsl(), and hsla() syntaxes work universally.

The 8-digit HEX notation (#RRGGBBAA) for alpha transparency is supported in Chrome 62+, Firefox 49+, Safari 10+, and Edge 79+. For broader compatibility, especially with older browsers, use rgba() instead of 8-digit HEX.

Practical Examples

Here are the same colors in all three formats for comparison:

• Crimson red: HEX #DC143C = RGB rgb(220, 20, 60) = HSL hsl(348, 83%, 47%)
• Royal blue: HEX #4169E1 = RGB rgb(65, 105, 225) = HSL hsl(225, 73%, 57%)
• Emerald green: HEX #50C878 = RGB rgb(80, 200, 120) = HSL hsl(140, 52%, 55%)
• Amber orange: HEX #FFBF00 = RGB rgb(255, 191, 0) = HSL hsl(45, 100%, 50%)
• Deep purple: HEX #6A0DAD = RGB rgb(106, 13, 173) = HSL hsl(275, 86%, 36%)

Use our Color Converter to convert any color between HEX, RGB, and HSL instantly. The tool also detects the format automatically when you paste a color value.