PowerShell URL Encode/Decode Quick Start: Encoding
Example
$url1 = [uri]::EscapeDataString("http://test.com?test=my value")
# url1: http%3A%2F%2Ftest.com%3Ftest%3Dmy%20value
$url2 = [uri]::EscapeUriString("http://test.com?test=my value")
# url2: http://test.com?test=my%20value
# HttpUtility requires at least .NET 1.1 to be installed.
$url3 = [System.Web.HttpUtility]::UrlEncode("http://test.com?test=my value")
# url3: http%3a%2f%2ftest.com%3ftest%3dmy+value
Note: More info on HTTPUtility.
