PowerShell base64 profile function

profile.ps1

function base64 {
    param (
        [Parameter(Mandatory=$true, ValueFromPipeline)]
        [string] $Value,

        [Parameter(Mandatory=$false, ValueFromPipeline=$false)]
        [Switch] $Decode
    )
    if ($Decode) {
        return [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($Value))
    }
    else {
        return [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($Value))
    }
}

usage.ps1

# Encode
"foo" | base64
base64 -Value "foo"

# Decode
"Zm9v" | base64 -decode
base64 -Value "Zm9v" -decode