ByteArray - decode and encode from Base64

'Convert a string to a Base64
Dim ByteArray
Set ByteArray = CreateObject("ScriptUtils.ByteArray")

'Put some characters to the bytearray.
ByteArray.String = "Put some characters to the bytearray."

'Write the characters in original (windows-1250) charset
Dim Base64String
Wscript.Echo "Source data:" & vbCrLf & _
  ByteArray.String 

Base64String = ByteArray.Base64.String
Wscript.Echo "Base64 encoded string:" & vbCrLf & _
  Base64String

Base64String = ByteArray.Base64(30).String
Wscript.Echo "Base64 encoded string with short lines:" & vbCrLf & _
  Base64String

Wscript.Echo "Part of data encoded to base64:" & vbCrLf & _
  ByteArray.Mid(3,3).Base64.String

'Convert a File to a Base64
ByteArray.ReadFrom "F:\data\vbs\del.vbs"

Base64String = ByteArray.Base64.String
Wscript.Echo "Base64 encoded file:" & vbCrLf & _
  Base64String

ScriptUtils.ByteArray

Works with safearray binary data - save/restore binary data from/to a disk, convert to a string/hexstring, codepage/charset conversions, Base64 conversion, etc.
     ByteArray is a COM class specially designed to work with Microsoft Windows Scripting engines - VB Script and JScript in Active Server Pages or WSH and in CHM or HTA applications. It also works with VB Net, Visual basic (VBA - VB 5, VB 6, Word, Excel, Access, …), C#, J#, C++, ASP, ASP.Net, Delphi and with T-SQL OLE functions - see Use ByteArray object article. You can also use the object in other programming environments with COM support, such is PowerBuilder.
     Source code for ByteArray is available within distribution license, please see License page for ASP file upload and ScriptUtilities.

ScriptUtils

Huge ASP upload is easy to use, hi-performance ASP file upload component with progress bar indicator. This component lets you upload multiple files with size up to 4GB to a disk or a database along with another form fields. Huge ASP file upload is a most featured upload component on a market with competitive price and a great performance . The software has also a free version of asp upload with progress, called Pure asp upload , written in plain VBS, without components (so you do not need to install anything on server). This installation package contains also ScriptUtilities library. Script Utilities lets you create hi-performance log files , works with binary data , you can download multiple files with zip/arj compression, work with INI files and much more with the ASP utility.