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App compressor

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Version 3.6 for Windows, English
2MB download / 5MB installed
Notes | Antivirus Scan | Details AppCompactor can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the Platform for easy installs and automatic updates.

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Description AppCompactor allows you to easily compress application to decrease size on disk and increase performance when running from a slow media (like flash drives). It features:

  • Proven UPX binary compressor
  • 7-Zip compression of archives
  • Multiple compression levels
  • Automatic testing of compressed files
  • Automatically skips <4K files (no space savings)
  • Add inclusions/exclusions using Format
  • Compression of DLL, EXE, ZIP, JAR, IRC, PYD and BINs in all directories
  • Automatically skip launcher if selecting Format apps' base directory
  • Automatically excludes Visual C++ runtimes and Qt image handlers
  • Saving up to 50% or more installed space of many apps
  • Faster application starts from flash drives
  • The same technology we formerly used in Portable, Pidgin Portable, GIMP Portable and more!

Please mention us and link back here if you use our AppCompactor in your releases as a way of saying thanks. We appreciate it!

App Notes

Helpful tips:
  • Don't compress NSIS launchers (FirefoxPortable.exe, etc), they'll break
  • It's best to have the app you're compressing reside on a hard drive (at least temporarily) rather than a flash drive to improve performance and decrease writes to your flash drive
  • You can disable the Welcome screen or have the console window stay by editing the settings.ini in the Data directory
  • Only NRV2E should be used for Releases (including development tests and pre-releases) unless it's a small app (one exe and a dll or two) and very easy for you to test every feature and function on every Windows OS.
  • Always back up your files before using this tool as it will not work with all applications.

False Positive Note: The current UPX 64-bit binary has false positives in a handful of antivirus engines. We've reported the issue to them.


For help with this app, please see the following:

Download Details

Open Source Initiative
  • Publisher:
  • Date Updated: 2021-12-27
  • Date Added: 2008-03-20
  • System Requirements: Windows XP, Vista, 7, 8, 10, 11 & WINE
  • App License: Open Source (GPL)
  • Source: UPX, 7-Zip, Launcher source included, Installer
  • MD5 Hash: 7040c366f91c18b613897a4ca1dc4782
  • SHA256 Hash: 5a5ca29a83625d95a7ccc38e773c11d213cb2ec90b74c6fde226f295e1a90b32 AppCompactor is a trademark of Rare Ideas, LLC