How to decode a Base64 string?

Question

I have a normal string in Powershell that is from a text file containing Base64 text; it is stored in $x. I am trying to decode it as such:

$z =         


        

Answer 1

This page shows up when you google how to convert to base64, so for completeness:

$b  = [System.Text.Encoding]::UTF8.GetBytes("blahblah")
[System.Convert]::ToBase64String($b)