UPX iconUPX 3.91

An Open Source, versatile, extendable, free, portable, high-performance executable packer
UPX (short from Ultimate Packer for eXecutables) is a free, open source, extendable, portable, and high-performance command-line software written in portable endian-neutral C++ that can be used to pack executable files.

Ultimate Packer for eXecutables features excellent compression ratio, extendable, checksum integration, very fast decompression, allows users to list, test and unpack executables, and can pack a wide range of executable types.

UPX provides support for many executable formats, including Linux kernel, Linux shell script, Linux ELF, Windows 64-bit executable or DLL, Windows CE executable or DLL, Mac OS X executable, BSD generic, FreeBSD ELF, NetBSD ELF, OpenBSD ELF, Windows 32-bit executable or DLL, PlayStation 1 executable, Atari MiNT/TOS executable, DOS 16-bit executable, and more.

last updated on:
December 2nd, 2013, 12:26 GMT
developed by:
UPX Team
license type:
GPL (GNU General Public License) 
ROOT \ System \ Boot


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user rating 21



1 Screenshot
What's New in This Release:
  • Experimental support for Win64/PE
read full changelog

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