Folder Compression Through FTP?

I was wondering if it is possible to compress a folder already on a FTP from my PC. The problem is I am trying to transfer the folder from FTP/1 to FTP/2. Problem is FTP/2 dosent allow anything that isnt compressed using .TAR methods or .ZIP.
I have tar.exe in the folder already. I have tryed basic commands such as tar -cvf filename.tar filename/. And or !compress filename.tar. Im not familliar with FTP commands but as far as I know there isnt a command to compress a folder through FTP. I only have FTP access and cant access it any other way.
If any help is out there it would be greatly appreciated, agian just want to know how to compress a folder through FTP.