UPX (Ultimate Packer for eXecutables) for Windows 3.04

4.7 out of 5 stars 4.7 (121 votes)

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Windows 2000/9x/Server 2003/XP / Open Source / 16,270 downloads

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.

  • Homepage

    UPX (Ultimate Packer for eXecutables)

  • Latest Changes

    - New format Mach/AMD64 supports 64-bit programs on Apple Macintosh

    - New formats Dylib/i386 and Dylib/ppc32 support shared libraries

    - Init function (LC_ROUTINES command) is required

    - New format vmlinuz/armel for Debian NSLU2 (etc.) linux kernel

    - Bvmlinuz boot protocol 2.08 for 386 Linux kernel

    - Extended ABI version 4 for armel-eabi ARM Linux ELF

  • Other Versions

    UPX (Ultimate Packer for eXecutables) for Linux

Reviews

Discussions

Reviews of UPX (Ultimate Packer for eXecutables) for Windows

  1. 5 out of 5 stars
    KAK

    Reviewing 3.04 (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!

  2. 5 out of 5 stars
    Joseph A

    Reviewing 3.03 (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

  3. 5 out of 5 stars
    therube

    Reviewing 3.03 (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.

  4. 5 out of 5 stars
    anomoly

    Reviewing 3.01 (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.

  5. 5 out of 5 stars
    brusco

    Reviewing 3.01 (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.

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