What is an 8-digit hex code?

An 8-digit hex code is #RRGGBBAA, where the last two characters encode the alpha (opacity) channel from 00 (fully transparent) to FF (fully opaque). It is supported in all modern browsers.

How is the alpha byte calculated?

The 0-1 alpha is multiplied by 255 and rounded, then written as two hex digits. For example, an alpha of 0.5 becomes 128, which is 80 in hex.

Is anything sent to a server?

No. The conversion runs entirely in your browser — nothing is uploaded or logged.

RGBA to Hex Converter

Convert RGBA colour with alpha into an 8-digit hex code.

RGBA to hex converter

Enter red, green, blue and an alpha value and get the equivalent 8-digit hex code (#RRGGBBAA) instantly, with a live colour swatch.

The eighth pair of hex digits carries the opacity, so you can use a single hex string for semi-transparent colours in CSS. The whole conversion runs in your browser — nothing is uploaded.