RGB to Hex Color Converter — Instant Decimal ⇄ Hex Conversion
Convert RGB decimal values to hex color codes and back, instantly and for free — handy for CSS, design tools, and quick color code lookups.
Decimal (Base 10)
| R | |
|---|---|
| G | |
| B |
Hex (Base 16)
| # |
|---|
Tips
- In CSS you can specify colors in both
#RRGGBBandrgb(R, G, B)formats. - Each channel — R (red), G (green), B (blue) — ranges from 0 to 255 (00 to FF in hex).
- White is
#FFFFFF(255, 255, 255) and black is#000000(0, 0, 0). - Design tools like Figma and Adobe XD support both formats, so you can copy a value and use it directly.
- The shorthand
#FFFis equivalent to#FFFFFF(white) and is valid CSS.
FAQ
#FFFFFF and #ffffff are treated identically in CSS. Hex color codes are case-insensitive.#RRGGBB → #RGB). A value like #1DA1F2 cannot be shortened.
Side Note — The Mystery of Color: The Human Eye and 16.7 Million Colors
The human eye is estimated to distinguish about 10 million colors (individual variation applies). 24-bit RGB color (8 bits per channel) can represent 16,777,216 colors — far exceeding human perceptual limits.
Famous brand colors in RGB: Twitter Blue #1DA1F2 (29, 161, 242), Google Red #EA4335 (234, 67, 53), LINE Green #00B900 (0, 185, 0). Tiffany's iconic blue — Tiffany Blue — is close to #0ABAB5 and is one of the few trademarked colors in the world.
An interesting story: CSS has a named color called rebeccapurple (#663399). It was proposed by the CSS community as a tribute to Rebecca, the 6-year-old daughter of CSS specification author Eric Meyer, and officially adopted in 2014. It remains a deeply remembered story in the engineering community.