Free UPX v2.4

billon on 13 May 2017
  • 2MB (uncompressed)
  • Released on 13 May 2017
  • Suggested by jack

Free UPX allows you to compress or decompress EXE, DLL, OCX, BPL, CPL and other files. It offers easy access to all documented and undocumented UPX parameters without the need for accessing the command-line.

The program is an advanced interface for the UPX (Ultimate Packer for eXecutables). It uses the Microsoft Portable Executable and COFF Specification.

System Requirements: WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application folder
Stealth: ? Yes
Unicode support: No
License: Freeware
How to extract: Download the "Portable" ZIP package and extract to a folder of your choice. Launch fupx.exe.
Similar/alternative apps: PortableApps AppCompactor
What's new?
  • Added support for the latest version of the UPX: 3.94.

6 comments on Free UPX  The Portable Freeware Collection Latest Entries Feed

bajaatan 2011-01-08 10:49

Free UPX as Portable Apps installer at

smaragdus 2017-01-14 15:15

I think that this program can be potentially dangerous- it has an explicit Facebook link in the tool-bar, which, if hit by mistake, will open Facebook and thus infect the system- unfortunately not many users know what is "datr" and what it is doing.
I have no respect for developers who have Facebook pages and promote them. Twitter is fine but Facebook was never, is not and will never be fine.


jack 2017-02-17 17:27

This program I wrote in 2008 and I am developing it until today. It cost me a LOT of work and time. And you write that you do not respect me and my work, only because I've added the "Facebook button" to the toolbar. Thank you very much!


smaragdus 2017-02-21 04:56

First- I do not know you and I have nothing against you. I suppose you may be a very nice guy. Nothing personal here. My sister uses Facebook and I have no respect for her because of that. The same applies to my niece and to anyone who uses Facebook, I make no difference between family, friends, acquaintances. If Jesus Christ was using Facebook I would not have any respect for him either. I make no exceptions. I believe that Facebook is evil and that anyone who uses it is an accomplice in spreading of evil. I have the same attitude towards those who use Windows 10 because I believe that it is evil as well. There are two users at the forum who I know that they use Windows 10- they are nice, they have helped me a lot, I like them, I am thankful to them for their help but I do not respect them either just because by using Windows 10 they accept evil and help evil propagate. I also had Facebook but I deleted my account because if I had kept using it would have lost respect for myself. Anyway, I appreciate your work as developer of free programs. In case some day you decide to delete your Facebook account I will provide the link I once used below:
"How do I permanently delete my account?"


webfork 2017-02-21 22:51

@smaragdus & @jack: Recommend pushing this discussion to forums.


__philippe 2017-02-22 13:39

For the Facebook-allergic crowd, might as well use directly the original Command-Line UPX engine:

Terse CLI simplicity:

upx  -l sample1.exe  (Checking whether PE is packed with UPX)
upx -d sample1.exe  (Decompressing an UPX-packed PE)
upx     sample2.exe  (Compressing a plain PE)

UPX engine additional pointers:


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