ToolPremier Logo
ToolPremier

Home  ›  Color Tools  ›  RGB to HEX Converter

RGB to HEX Converter

Convert RGB and RGBA color values to HEX format instantly. Enter your red, green, and blue channel values and get the corresponding HEX code ready to copy into your project.
✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
RGB to HEX Converter – ToolPremier

RGB to HEX Converter · supports Alpha transparency output · instant copyable strings

How it works

Convert your color in three steps

1. Enter your RGB values

Input the red, green, and blue channel values, each ranging from 0 to 255. Optionally add an alpha value between 0 and 1 if you need an 8-digit HEX output with transparency.

2. Preview the result

A live color swatch updates in real time as you type, giving instant visual confirmation of the color you are working with before you copy the output.

3. Copy the HEX code

Click the copy button to grab the 6-digit HEX code, or the 8-digit version with alpha if you entered an opacity value, formatted and ready to paste into CSS, HTML, or any design tool.

FAQ

Common questions

Each RGB channel value (0–255) is converted from decimal to a two-digit hexadecimal number, then the three pairs are concatenated with a # prefix. For example, rgb(58, 134, 255) converts as: 58 → 3A, 134 → 86, 255 → FF, producing #3a86ff. Values below 16 are zero-padded to maintain the two-character format — for example, decimal 9 becomes 09 in hex. For RGBA, the alpha value (0–1) is multiplied by 255, converted to hex, and appended as a fourth pair to produce an 8-digit HEX code.
HEX is the conventional notation in HTML attributes and is slightly more compact in CSS. If a design tool, screenshot picker, or external reference provides RGB values, converting to HEX makes them easier to paste into HTML files or stylesheet rules. Some frameworks and template systems expect HEX format specifically. The reverse is also true — HEX values are less immediately readable than RGB, so the preferred format often comes down to team conventions and which tools your workflow touches most frequently.
Each RGB channel must be an integer between 0 and 255 inclusive. Values below 0 or above 255 fall outside the valid range for the sRGB color space and are not valid color inputs. The tool will flag out-of-range inputs with a validation message. If you are working with CSS percentage-based RGB notation (e.g., rgb(22%, 52%, 100%)), multiply each percentage by 2.55 to convert it to the 0–255 integer range before entering it into this tool.
You can extract the three channel numbers from a CSS rgb() function and enter them individually into the red, green, and blue fields. For example, from rgb(58, 134, 255), enter 58, 134, and 255 in the respective fields. Depending on the implementation, some versions of this tool may also accept a pasted rgb() string directly and parse the values automatically. For frequent bulk conversions of CSS color declarations, a CSS preprocessor with built-in color functions handles this more efficiently at build time.

Keep going

Related tools

HEX to RGB Converter

Convert HEX color codes back to RGB values.

Open tool →

Color Picker

Pick colors interactively and get both RGB and HEX outputs simultaneously.

Open tool →

Color Contrast Checker

Use your converted HEX values to check WCAG accessibility compliance.

Open tool →

Color Palette Generator

Build a full harmonious palette from your base color in any format.

Open tool →

About the RGB to HEX Converter

The RGB to HEX Converter translates decimal RGB color values into hexadecimal notation for use in HTML, CSS, and design tools. It is used when moving color values between applications that output different formats, or when transitioning from programmatic color values common in JavaScript and image processing into the HEX notation expected in stylesheets. RGBA to 8-digit HEX conversion is also supported for transparent colors.

Benefits

  • Accepts individual R, G, B channel values with an optional alpha for 8-digit HEX output
  • Live color swatch gives instant visual feedback as channel values are entered
  • One-click copy of the resulting HEX code in the correct format
  • Instant browser-based processing with no server communication required

Privacy

RGB values entered into this tool are processed entirely in your browser; no inputs or outputs are transmitted to any external server.