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Ultimate Packer for eXecutables


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This package was approved by moderator AdmiringWorm on 11/3/2017.

UPX achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks for most of the formats supported, because of in-place decompression.

To install Ultimate Packer for eXecutables, run the following command from the command line or from PowerShell:

C:\> choco install upx --version 3.94

To upgrade Ultimate Packer for eXecutables, run the following command from the command line or from PowerShell:

C:\> choco upgrade upx --version 3.94


  • tools\chocolateyInstall.ps1 Show
    $packageName = 'upx'
    $url = ''
    $checksum = '74308DB1183436576D011BFCC3E7C99C836FB052DE7B7EB0539026366453D6E8'
    $checksumType = 'sha256'
    $toolsDir = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
    Install-ChocolateyZipPackage -PackageName "$packageName" `
                                 -Url "$url" `
                                 -UnzipLocation "$toolsDir" `
                                 -Checksum "$checksum" `
                                 -ChecksumType "$checksumType"

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


This package has no dependencies.

Package Maintainer(s)

Software Author(s)

  • Markus Oberhumer
  • Laszlo Molnar
  • John Reiser


© 1996 Markus Franz Xaver Johannes Oberhumer, László Molnár, John F. Reiser


Release Notes

Version History

Version Downloads Last updated Status
Ultimate Packer for eXecutables 3.94 16286 Tuesday, October 31, 2017 approved
Ultimate Packer for eXecutables 3.91 8391 Wednesday, July 8, 2015 approved
upx 3.09 1191 Wednesday, June 12, 2013  
upx 3.08 675 Friday, February 15, 2013  
Ultimate Packer for eXecutables 3.07 248 Monday, May 16, 2016 approved

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