HEX Opacity / Alpha Calculator

Convert transparency percentages to 8-digit Hexadecimal alpha values securely

Safe conversion with no data sent to server

Input

Base Color (HEX)

Opacity50%

Preview

100% Opacity

50% Opacity

CSS Output

8-Digit HEX#3B82F680

RGBArgba(59, 130, 246, 0.5)

HSLAhsla(217, 91%, 60%, 0.5)

HEX Opacity Reference Table

What is 8-Digit HEX Color?

Traditionally, web HEX colors are 6 digits long (e.g., #FF0000 for pure red). With the introduction of CSS4, an 8-digit hex code was standardized. The last two digits represent the alpha (opacity) channel. For example, #FF000080 is exactly 50% transparent red!

RGBA vs 8-Digit HEX: Which to Use?

Both rgba() and 8-digit #RRGGBBAA are fully supported across all modern browsers (Chrome, Firefox, Safari). HEX is often preferred when storing theme colors in robust, strict databases or transferring them between native iOS/Android code and the web.

How to Compute the Alpha Hex Manually

Alpha is measured on a scale from 0 to 255. To find the Hex value of 50%, you multiply 255 by 0.5 (which is 127.5). Rounded to 128, you convert 128 to hexadecimal, which is exactly 80.