The following attached zip file is a base64 encoder/decoder.
Unzip the following base64.zip
The data to encode must be in a file called EncodeThis.txt (case sensitive), so if you have a Picture.pdf, then make a copy of this file and rename the copy to EncodeThis.txt then run the Encode.bat file. A file called Encoded.txt will be created.
The data to decode must be in a file called DecodeThis.txt (case sensitive), then run the Decode.bat file. A file called Decoded.txt will be created. Apply the appropriate extension to the generated Decoded.txt to properly access it in its native form.