Free Color Converter Online: HEX, RGB, HSL — Convert Any Color Format
Colors on the web are expressed in several different formats. CSS accepts HEX codes, RGB values, HSL notation, and named colors. Design tools often use their own representations. When you copy a color from Figma and need it in CSS, or extract an RGB value from an image editor and need the HEX code, you need a color converter.
This guide explains the three main color formats used in web development, when each is appropriate, and how to convert between them instantly using a free online tool.
The Three Color Formats You Need to Know
#3B82F6A 6-digit hexadecimal code. Each pair of digits represents red, green, and blue (00–FF). The most common format in CSS and design systems. Compact and easy to copy.
Best for: CSS stylesheets, design tokens, brand color documentation.
rgb(59, 130, 246)Three integers from 0 to 255 representing red, green, and blue. RGBA adds a fourth value (0–1) for opacity. More readable than HEX for understanding color composition.
Best for: When you need to adjust individual channels or add transparency via RGBA.
hsl(217, 91%, 60%)Hue (0–360°), Saturation (0–100%), Lightness (0–100%). The most human-readable format — you can reason about the color without needing to decode numbers.
Best for: Programmatically generating color variations, theming, and accessible color palettes.
How to Convert HEX to RGB
A HEX code like #3B82F6 breaks into three pairs: 3B, 82, F6. Each pair is a hexadecimal number. Convert each to decimal:
In practice, you never need to do this by hand. Use the ToolzGo Color Converter to convert any color instantly.
How to Convert RGB to HSL
Converting RGB to HSL involves normalizing the RGB values to 0–1, finding the maximum and minimum channel, then computing hue, saturation, and lightness from those values. The math is involved — here's the practical approach:
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Divide each R, G, B value by 255 to get values between 0 and 1.
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Find the max and min of the three normalized values.
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Lightness = (max + min) / 2.
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Saturation = (max − min) / (1 − |2L − 1|), or 0 if max === min.
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Hue is computed from which channel is max and the difference between the other two.
Again, use the converter — that's why it exists.
Which Format Should You Use in CSS?
How to Use the ToolzGo Color Converter
- 1
Open the Color Converter at toolzgo.com/tools/developer-tools/color-converter
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Enter your color value in any supported format: HEX, RGB, HSL, or RGBA.
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The converter instantly shows the equivalent value in all other formats.
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Click any output field to copy the value directly.
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Use the color preview swatch to visually confirm the color before pasting.
Frequently Asked Questions
Is HEX the same as hexadecimal?
Yes. A HEX color code uses the hexadecimal (base-16) number system, where digits go 0–9 then A–F. Each color channel (R, G, B) is represented by two hex digits, giving values from 00 (0) to FF (255).
What is the difference between RGB and RGBA?
RGB has three channels: red, green, and blue. RGBA adds a fourth channel for alpha (transparency), ranging from 0 (fully transparent) to 1 (fully opaque). For example, rgba(0, 0, 0, 0.5) is a 50% transparent black.
Why does HSL make colors easier to work with?
Because the hue, saturation, and lightness channels map to human intuitions. To make a color lighter, increase lightness. To make it less saturated, decrease saturation. With RGB or HEX you would need to adjust all three channels simultaneously.
Can CSS use all three formats?
Yes. Modern CSS accepts hex (#3B82F6), rgb(), rgba(), hsl(), hsla(), and named colors (blue, red, etc.) interchangeably. The browser renders them identically.
Related tools: CSS minifier, HTML formatter, and the full color converter.
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