base64_encode_file.ps1

# Encode file into base64
# Use to encode images into base64 string to include in html
# <img src="data:$mimetype;base64,$base64string">
# example
# <img src="data:image/png;base64,$base64string">
# <img src="data:image/jpeg;base64,$base64string">
# <img src="data:image/gif;base64,$base64string">

clear-host
Function Get-FileName($initialDirectory)
{
 [System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") | Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = $initialDirectory
$OpenFileDialog.filter = "All files (*.*)| *.*"
$OpenFileDialog.ShowDialog() | Out-Null
$FileName = $OpenFileDialog.filename
$FileName

} #end function Get-FileName
$FileName = Get-FileName
$base64string = [Convert]::ToBase64String([IO.File]::ReadAllBytes($FileName))
$base64string | set-content  ($FileName + ".b64")
Write-Host "ENCODED: `n`n" $base64string "`n`n"

#decode file from base64
#[IO.File]::WriteAllBytes($FileName, [Convert]::FromBase64String($base64string))