FUPX v3.1

billon on 14 May 2020
  • 2MB (uncompressed)
  • Released on 14 May 2020
  • Suggested by jack

FUPX (formerly 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.

Alternatively, FUPX Portable is in PortableApps.com Format and includes both the 32-bit and 64-bit versions of the app.

Runs on:WinXP / Vista / Win7 / Win8 / Win10
Writes settings to: Application folder
Stealth: ? Yes
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? See:

8 comments on FUPX  The Portable Freeware Collection Latest Entries Feed

jack 2018-09-19 12:51

There was an error in the script creating the distribution files. It was my mistake, not a deliberate act.
I uploaded the corrected file FUPX_PORTABLE.7z to the server and now everything should be OK.
Hint: To set the 32-bit version of UPX, click the "Options" button on the toolbar. Then, on the "UPX version" list, select "3.95 32-bit" and click "Close".
Sorry for the inconvenience.

I removed the "Facebook" button from the toolbar.


gbrao 2018-09-18 23:40

FUPX v2.5 seems to only support UPX 3.95 64-bit ( not 32-bit).


__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:


webfork 2017-02-21 22:51

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


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?"


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 2017-01-14 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.


bajaatan 2011-01-08 10:49

Free UPX as Portable Apps installer at


Post your comment