HEX: Web Color Codes
Hex web color code (HEX) is a hexadecimal notation for specifying colors in digital design, commonly used in CSS and design systems.
HEX codes represent RGB channel values in base-16. They are a standard way to communicate UI colors between design and development. For accessibility and consistency, pair HEX codes with usage rules, contrast targets, and token naming.
Example
#FF0000 equals RGB(255, 0, 0). Short HEX like #F00 is a compact form of #FF0000.
Frequently Asked Questions
They encode the same channel values. HEX is just a different notation for RGB used in code and documentation.
It often includes alpha (transparency), for example #RRGGBBAA. Support depends on the environment, but modern CSS supports it.
If color management differs, the same numeric RGB can be displayed differently. Keep your working space consistent, usually sRGB for web.
Yes for digital. Also include CMYK and Pantone when print is involved, plus usage context and contrast guidance.
Use semantic tokens like Primary/Accent/Surface instead of color names. Then map those tokens to HEX values per theme.
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