File Management Compression UPX (Ultimate Packer for eXecutables) for Windows

UPX (Ultimate Packer for eXecutables) for Windows 3.04 for Windows

by Markus & László

Avg. Rating 4.7 (121 votes)

File Details

File Size 0.3 MB
License Open Source
Operating System Windows 2000/9x/Server 2003/XP
Date Added
Total Downloads 16,958
Publisher Markus & László
Homepage UPX (Ultimate Packer for eXecutables)
Other Versions

Publisher's Description

UPX is a free, portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks because of in-place decompression.

Latest Reviews

KAK

KAK reviewed v3.04 on Jan 27, 2011

i use UPX! since 2001 and after 10 years i have found
no other packer with this PERFECT compressing results.

Big Thanks to the Developer for this nice peace of work!

Joseph A

Joseph A reviewed v3.03 on Jul 29, 2008

To "therube" below:

You are right on this. That is why I suggested that they include it in FileForum yesterday night.

You can contribute too: whenever you find that there is a program or a new version of an existing program which was not posted in FileForum, suggest it to the Forum. They usually act fast on your suggestion.

To do this, click on "List a Program" at the top of the page, whose address is
http://fileforum.betanews.com/addprogram

therube

therube reviewed v3.03 on Jul 29, 2008

Just to point out, though this is is just (7-29-08) appearing in betanews, the 3.03 version has been out for 3 months now.

anomoly

anomoly reviewed v3.01 on Aug 1, 2007

My portable Alpx folder has these files:
COMDLG32.OCX
LZOP100 & 101.EXE
upx.1, .doc, & .html
UPX291.EXE (upx.exe)
Must have for portable standalone aps.

brusco

brusco reviewed v3.01 on Aug 1, 2007

best exe packer out there. been using it since 1.02 and has successfully compressed exe,ocx,dlls for me about 99% of the time.

I love it.

guti

guti reviewed v3.0 on May 1, 2007

Yeah, the old good boy, is still the best!

Kal-El

Kal-El reviewed v2.92 Beta on Mar 6, 2007

LZMA FTW! faster and better compression than --best

anomoly

anomoly reviewed v2.92 Beta on Jan 25, 2007

By replacing the exe in alpx (UPX291.EXE) and renaming it exactly I see no problem with alpx's gui either.
http://fileforum.betanew...etail/Alpx/1110410043/1

reets

reets reviewed v2.92 Beta on Jan 24, 2007

Absolutely the best. Used a LOT of other exe packers and this one is far above any other. Just waiting for .NET support then I am all set. (hopefully they add support for it)

[deXter]

[deXter] reviewed v2.91 Beta on Nov 30, 2006

Well, about time that someone submitted the 2.9x beta series to FileForum :)

The biggest change in the 2.9x series is the implementation of the LZMA algorithm. What this means is that your files have a MUCH better compression (even better than the --best option).

For testing purposes, I compressed the AutoHotkey compiler executable (AutoHotkeySC.bin) with the --best and --lzma options:

Original Size: 391 KB
--best option: 205 KB
--lzma option: 193 KB

Another important point to note is that the --lzma option is much more faster and efficient than the --best option. Check out the ratios for Firefox 2 executable:

Original size: 7,604,331
--best option: 3,246,592
--lzma option: 2,867,200

Truly, this is quite a significant improvement and brings UPX at par with other compressors that have already implemented lzma. But what seperates UPX from the competitors is the fact that UPX is rock solid and the exes are always working. I haven't come across a single exe that stopped working because of UPX. On the other hand, I've seen plenty of corrupted exes from the competitors.

UPX also supports a wide range of executables including *nix binaries, device drivers, 16 bit executables.. and.. even atari and PSone exes!

It's this stability and portability that makes UPX the prefered choice.

Avg. Rating 4.7 (121 votes)
Your Rating
KAK

KAK reviewed v3.04 on Jan 27, 2011

i use UPX! since 2001 and after 10 years i have found
no other packer with this PERFECT compressing results.

Big Thanks to the Developer for this nice peace of work!

Joseph A

Joseph A reviewed v3.03 on Jul 29, 2008

To "therube" below:

You are right on this. That is why I suggested that they include it in FileForum yesterday night.

You can contribute too: whenever you find that there is a program or a new version of an existing program which was not posted in FileForum, suggest it to the Forum. They usually act fast on your suggestion.

To do this, click on "List a Program" at the top of the page, whose address is
http://fileforum.betanews.com/addprogram

therube

therube reviewed v3.03 on Jul 29, 2008

Just to point out, though this is is just (7-29-08) appearing in betanews, the 3.03 version has been out for 3 months now.

anomoly

anomoly reviewed v3.01 on Aug 1, 2007

My portable Alpx folder has these files:
COMDLG32.OCX
LZOP100 & 101.EXE
upx.1, .doc, & .html
UPX291.EXE (upx.exe)
Must have for portable standalone aps.

brusco

brusco reviewed v3.01 on Aug 1, 2007

best exe packer out there. been using it since 1.02 and has successfully compressed exe,ocx,dlls for me about 99% of the time.

I love it.

guti

guti reviewed v3.0 on May 1, 2007

Yeah, the old good boy, is still the best!

Kal-El

Kal-El reviewed v2.92 Beta on Mar 6, 2007

LZMA FTW! faster and better compression than --best

anomoly

anomoly reviewed v2.92 Beta on Jan 25, 2007

By replacing the exe in alpx (UPX291.EXE) and renaming it exactly I see no problem with alpx's gui either.
http://fileforum.betanew...etail/Alpx/1110410043/1

reets

reets reviewed v2.92 Beta on Jan 24, 2007

Absolutely the best. Used a LOT of other exe packers and this one is far above any other. Just waiting for .NET support then I am all set. (hopefully they add support for it)

[deXter]

[deXter] reviewed v2.91 Beta on Nov 30, 2006

Well, about time that someone submitted the 2.9x beta series to FileForum :)

The biggest change in the 2.9x series is the implementation of the LZMA algorithm. What this means is that your files have a MUCH better compression (even better than the --best option).

For testing purposes, I compressed the AutoHotkey compiler executable (AutoHotkeySC.bin) with the --best and --lzma options:

Original Size: 391 KB
--best option: 205 KB
--lzma option: 193 KB

Another important point to note is that the --lzma option is much more faster and efficient than the --best option. Check out the ratios for Firefox 2 executable:

Original size: 7,604,331
--best option: 3,246,592
--lzma option: 2,867,200

Truly, this is quite a significant improvement and brings UPX at par with other compressors that have already implemented lzma. But what seperates UPX from the competitors is the fact that UPX is rock solid and the exes are always working. I haven't come across a single exe that stopped working because of UPX. On the other hand, I've seen plenty of corrupted exes from the competitors.

UPX also supports a wide range of executables including *nix binaries, device drivers, 16 bit executables.. and.. even atari and PSone exes!

It's this stability and portability that makes UPX the prefered choice.

[deXter]

[deXter] reviewed v2.03 on Nov 28, 2006

You guys should try out the new UPX 2.90 (Beta). It's got LZMA compression atlast! And it knocks the socks off all other options (--best/--force/--brute, etc).

Das mod

Das mod reviewed v2.03 on Nov 27, 2006

sweet prog.

The MAZZTer

The MAZZTer reviewed v2.03 on Nov 27, 2006

I use this tool to compress programs for use on my USB thumb drive. Works excellently! It can even compress linux binaries from within Windows!

--brute is fun to use to get those last few bytes out, but it usually doesn't give you a better size than --best, so that is my recommended option. If you run across a binary already compressed, you can -d it to decompress it and recompress it with --best to see if you can squeeze any more out of it. :)

VictorAnderson

VictorAnderson reviewed v2.03 on Nov 27, 2006

hey eblade - uhhh I don't think you're using the program properly because this thing does work.

I use it mostly to compress stuff for my pocketpc and it has made a HUGE difference in how many apps I can load into main memory on it - plus it runs a bit faster too.

eblade- what I do is copy the .exe I want to compress to a working folder - compress it - then overwrite the orginal with my compressed one. Obvisouly you're not ever removing the orginal, uncompressed file.

pluto2se

pluto2se reviewed v2.01 on Jun 21, 2006

ignore eblade's comment all together, it's not true, upx is great!

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