What are valid RGB values?

Each channel — Red, Green, and Blue — accepts an integer from 0 to 255. A value of 0 means none of that channel's light is present; 255 is full intensity. Values outside that range are not valid RGB and will be clamped.

What is the hex equivalent of pure red, green, and blue?

Pure red is rgb(255, 0, 0), which converts to #FF0000. Pure green is rgb(0, 255, 0) = #00FF00. Pure blue is rgb(0, 0, 255) = #0000FF. Black is #000000 and white is #FFFFFF — every channel at minimum or maximum respectively.

Can RGB values be decimals?

No. The standard CSS rgb() function and hex notation both require integer channel values from 0 to 255. If you have a normalized fractional value (0.0–1.0), such as from a shader or design tool that stores color as floats, multiply by 255 and round before converting.

Why does my hex code have 8 characters instead of 6?

An 8-character hex code includes an alpha (transparency) channel as a fourth two-digit pair, for example #FF5733CC. This tool converts standard 3-channel RGB, which produces a 6-character hex code. If your source color includes alpha, that channel needs to be handled separately in CSS as rgba() or an 8-digit hex.

Is hex or RGB better to use in CSS?

Neither is objectively better — they render identically. Hex is more compact and common in design tools and style guides; the rgb() function is more readable when you need to see the individual channel values at a glance, and it more naturally extends to rgba() when you need transparency.

What does the HSL output actually tell me that RGB doesn't?

HSL separates hue (the actual color, 0-360°) from saturation (vividness) and lightness (how close to black or white it is). This makes it far easier to create a lighter or darker version of a color — just change the lightness value — without the trial-and-error of adjusting three interdependent RGB channels.

Can I convert a hex code back to RGB with this tool?

This tool converts RGB to hex, HSL, and CSS rgb() format. For the reverse direction, use the dedicated Hex to RGB tool, which accepts a hex string and outputs the equivalent RGB channel values.

Why do the RGB values from Photoshop's eyedropper not match what I see on another monitor?

This is usually a color profile or gamut difference between displays and applications, not a conversion error. The RGB-to-hex math itself is exact and lossless — any visual mismatch comes from how different screens or color-managed applications render the same numeric RGB value, not from the conversion formula.

RGB to Hex Converter — Convert RGB Colors to HEX and HSL Online Free

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What is RGB To Hex?

RGB to Hex is a free online color-conversion tool that turns RGB values (0–255 per channel) into the hexadecimal color code CSS and design tools actually expect, along with the equivalent HSL representation and a live swatch preview. Drag three sliders or type exact channel numbers and every output format updates together, so you always have HEX, HSL, and CSS rgb() available at once instead of running the conversion three separate times.

RGB and hex describe the exact same color space — they are not different colors, just different notations for the same three-channel data. RGB expresses each channel as a base-10 number from 0 to 255, which is how color pickers, image editors like Photoshop and GIMP, and canvas/WebGL code typically report values. Hex expresses the same three numbers in base-16, two digits per channel, packed into a single six-character string prefixed with #. The conversion is pure arithmetic — each 0–255 channel value becomes a two-digit hexadecimal pair — but doing that math by hand for anything other than a handful of round numbers (0, 255, 128) is error-prone and slow, especially when you are translating a color sampled from a screenshot, a brand guideline PDF listing RGB triplets, or a data visualization library that only accepts RGB arrays.

HSL (hue, saturation, lightness) is included alongside because it describes color in a way that is often more intuitive to adjust than either RGB or hex: hue is the position on the color wheel (0–360°), saturation is how vivid versus gray the color is, and lightness is how close to black or white it is. If you need to programmatically generate a set of related colors — five shades of the same hue at different lightness levels, for instance — HSL makes that trivial in a way RGB and hex do not, since you only need to vary one number.

This tool is aimed at the everyday translation work of frontend development and design handoff: converting a color a designer specified in RGB (common when sampled directly from an image or design tool color picker) into the hex notation used throughout a CSS codebase, verifying that a brand color guide's RGB and hex values actually match, or getting an HSL equivalent to build a lighter or darker variant of an existing brand color. Everything computes locally in JavaScript with no network round-trip, so results are instantaneous.

How It Works

Each RGB channel value (0–255) is converted independently into hexadecimal using number.toString(16), left-padded to two digits, then the three two-digit pairs are concatenated in R-G-B order and prefixed with #. For HSL, the RGB channels are first normalized to a 0–1 range; lightness is the average of the maximum and minimum normalized channel values; saturation is derived from the difference between max and min relative to the lightness; and hue is computed based on which channel holds the maximum value, using the standard piecewise RGB-to-HSL formula. All three representations — HEX, HSL, and CSS rgb() — are recalculated from the same source values whenever you adjust a slider or number input, so they never drift out of sync with each other.

How to Use

Enter or drag RGB values

Type exact Red, Green, and Blue values (each 0–255) into the number fields, or drag the corresponding sliders for quick visual adjustment.

Convert

Click "Convert" and the hex color code, HSL value, and CSS rgb() string are all generated instantly — for example #FF5733.

Preview the color

Check the full-width color swatch to visually confirm the result matches the color you intended before using it.

Copy the format you need

Click Copy next to HEX, HSL, or CSS rgb() individually — each format has its own copy button so you grab exactly what your project requires.

Paste into your CSS or design tool

Use the copied hex code in a CSS property, an HTML color attribute, or paste it into a design tool's color field for exact color matching.

Who Uses This Tool

🎨

CSS & HTML Color Codes

Convert the RGB values from a color picker or design tool into a compact hex code for use in HTML attributes and CSS.

🖼️

Image Sampling to CSS

Translate an RGB color sampled from a photo editing tool into a hex code to match brand colors in a website stylesheet.

🕹️

Game & Graphics Development

Convert RGB color values generated programmatically into hex strings for use in SVG fill attributes or canvas contexts.

📐

Design Token Creation

Build design system tokens by converting RGB values defined in a style guide into the hex codes expected by CSS frameworks.

🛠️

Terminal Color Output

Convert RGB color codes from ANSI escape sequences or terminal themes into hex for use in web-based code editors.

📊

Spreadsheet Chart Colors

Convert RGB values provided by a data visualization library into hex codes compatible with chart configuration objects.

Why Choose This Tool

Interactive RGB Sliders

Drag the red, green, and blue sliders to tune each channel visually, with the hex output updating live as you adjust.

Three Output Formats

Provides the HEX code, HSL string, and CSS rgb() function all at once so you have every format ready to use.

Live Color Preview

A full-width color swatch renders the exact color defined by your RGB values so you get instant visual feedback.

Channel Number Input

Type precise 0–255 values directly into the number fields alongside the sliders for exact color specification.

One-Click Copy Per Format

Each output (HEX, HSL, rgb()) has its own copy button so you grab only the format your project needs.

Fully Browser-Based

All calculations happen locally in JavaScript — no server required, no data sent, results are instantaneous.

Key Benefits

Interactive sliders plus precise numeric input for R, G, B channels

Live color preview swatch updates instantly as you adjust values

Shows HEX, HSL, and CSS rgb() output simultaneously

Independent copy button for each output format

Accurate standard RGB-to-HSL conversion formula, not an approximation

No rounding errors — exact 0-255 channel values in, exact hex pair out

100% browser-based — no server round-trip or upload needed

Useful for verifying brand color guides and design-to-code handoff

Frequently Asked Questions

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RGB To Hex

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