What is an 8-digit hex color?

It is a CSS hex color with an extra pair of digits for the alpha channel, written #RRGGBBAA. The final byte sets opacity from 00 fully transparent to FF fully opaque, so #ff000080 is red at about 50 percent opacity.

How is the alpha byte converted to a 0-to-1 value?

The two hex alpha digits form a number from 0 to 255, which is divided by 255 to get the CSS 0-to-1 alpha used in rgba(). So FF becomes 1.0, 80 becomes about 0.502, and 00 becomes 0.

Is #RRGGBBAA the same order as #AARRGGBB?

No. CSS and the web use #RRGGBBAA with alpha last. Android and some other platforms use #AARRGGBB with alpha first. This tool uses the CSS order, so do not paste Android-style values without reordering them first.

What happens if I enter a 6-digit hex?

A 6-digit hex has no alpha, so it is treated as fully opaque and an FF alpha byte is appended. The rgba() output will show an alpha of 1.0 and the normalized 8-digit hex will end in ff.

Does it accept shorthand alpha hex?

Yes. The 4-digit shorthand #RGBA is expanded by doubling each digit, so #38fc becomes #3388ffcc. Plain 3-digit shorthand #RGB is also accepted and treated as fully opaque.

Hex8 (RGBA Hex) Alpha Converter

Convert 8-digit hex colors with alpha

The #RRGGBBAA syntax lets a single CSS hex value carry an opacity in its final byte. This converter decodes any 8-digit hex into its red, green, blue, and alpha components, gives you the matching rgba() string, and round-trips back to hex. A checkerboard backing behind the swatch makes the transparency visible so you can judge how the color will actually composite.

How it works

The input is normalized first: shorthand #RGB and #RGBA are expanded by doubling each digit, and a 6-digit value gets an ff alpha appended. The three color bytes are parsed as 0–255 integers exactly as in any hex color. The alpha byte is parsed the same way, then divided by 255 to produce the CSS 0–1 alpha used in rgba(). Converting back simply reverses this: the 0–1 alpha is multiplied by 255 and formatted as a two-digit hex byte appended to the color.

Example and notes

The value #3b82f6cc decodes to rgba(59, 130, 246, 0.800) — a blue at 80% opacity. Watch the channel order: CSS uses alpha-last #RRGGBBAA, whereas Android uses alpha-first #AARRGGBB, so a value copied from Android tooling will look wrong unless you reorder it. The alpha-stripped 6-digit output is handy when you need a solid version of the same color, for instance as a fallback for older targets.