RGB to Hex Color Converter
Convert RGB color values to a hex color code instantly. Free, no signup.
How to use this tool
- Enter red (0-255), green (0-255) and blue (0-255) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your hex color and the full breakdown beneath it.
Convert red, green, and blue channel values (0-255) to a CSS hex color code for use in stylesheets and design tools.
How it works
RGB to Hex Color Converter takes three numeric color components -- red, green, and blue, each between 0 and 255 -- and converts them to a six-digit CSS hexadecimal color code. This is the reverse of hex-to-RGB conversion and is needed whenever you have raw RGB values from a design tool, image picker, or API and need them in CSS hex format.
Enter the integer values for each channel (0 to 255) in the three input fields and click Convert. The tool converts each decimal number to a two-digit hexadecimal string, zero-pads single-digit results, and concatenates them into a standard #rrggbb color code.
Typical use cases include converting colors sampled with an eye dropper tool, translating color values from image processing libraries, or generating hex codes programmatically and wanting to verify the result visually.
Worked example
Convert a sampled color to a CSS hex code
- Use your OS color picker to sample a color and note: R=255, G=87, B=34
- Enter 255 in Red, 87 in Green, 34 in Blue.
- Click Convert.
- Copy the output: #ff5722
#ff5722 -- a CSS-ready hex color code representing a deep orange.
Common mistakes to avoid
- Entering float values (like 0.5 for 50%) instead of integers (0-255): RGB in this tool uses the 8-bit integer scale, not the 0.0-1.0 float scale used in some graphic APIs.
- Confusing the red and blue channels: some systems (like Android) use BGR order; if your converted color looks wrong, try swapping the red and blue values.
- Forgetting to include the # when using the output in CSS: the color property requires #rrggbb format; omitting the # will cause the browser to ignore the color declaration.
Key terms
- Channel value
- The intensity of a single color component (red, green, or blue) expressed as an integer from 0 (absent) to 255 (maximum intensity).
- Zero-padding
- Prepending a 0 to a single-digit hex result so that each channel always occupies exactly two hex digits (e.g., decimal 5 becomes 05 in the hex color code).
- CSS color code
- A color format accepted by CSS, including hex codes (#rrggbb), rgb() functions, and named colors. Hex is the most widely used format in web design.
Frequently asked questions
- How do I convert RGB to hex?
- Convert each channel (0-255) to a two-digit hex number and concatenate them with a # prefix. For example rgb(255,0,0) becomes #ff0000.