StringToZip

 <Extension()> _
    Public Function toZip(text As String) As String
        Dim buffer As Byte() = System.Text.Encoding.Unicode.GetBytes(text)
        Dim ms As New MemoryStream()
        Using zipStream As New System.IO.Compression.GZipStream(ms, System.IO.Compression.CompressionMode.Compress, True)
            zipStream.Write(buffer, 0, buffer.Length)
        End Using

        ms.Position = 0
        Dim outStream As New MemoryStream()

        Dim compressed As Byte() = New Byte(ms.Length - 1) {}
        ms.Read(compressed, 0, compressed.Length)

        Dim gzBuffer As Byte() = New Byte(compressed.Length + 3) {}
        System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length)
        System.Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4)
        Return Convert.ToBase64String(gzBuffer)
    End Function
Example:
  Dim IMG_64 As String = PictureBox1.Image.toBase64
  Dim Zip64 As String = IMG_64.toZip

Description

Compactação de string utilizado geralmente para compactar Base64

Details

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