UPX the Ultimate Packer for eXecutables

UPX the Ultimate Packer for eXecutables git-75a2cc

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Edit: 24.01.2020
UPX has finally released an update after 1,5 years.

This build has become deprecated therefore.

Get the official release on upx/upx

If someone needs a git beta build hit me up and i update the resource.

This is a beta build of upx !

It allows to pack binaries build with Visual Studio 2019 (vc142)

UPX is a free, portable, extendable, high-performance executable packer for several executable formats.

The last official build of upx for win32 is v3.95 found on UPX: the Ultimate Packer for eXecutables - Homepage


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. UPX strengths in a nutshell:
  • excellent compression ratio: typically compresses better than WinZip/zip/gzip, use UPX to decrease the size of your distribution!
  • very fast decompression: ~10 MB/sec on an ancient Pentium 133, ~200 MB/sec on an Athlon XP 2000+.
  • no memory overhead for your compressed executables because of in-place decompression.
  • safe: you can list, test and unpack your executables. Also, a checksum of both the compressed and uncompressed file is maintained internally.
  • universal: UPX can pack a number of executable formats.
  • portable: UPX is written in portable endian-neutral C++.
  • extendable: because of the class layout it's very easy to add new executable formats or new compression algorithms.
  • free: UPX is distributed with full source code under the GNU General Public License v2+, with special exceptions granting the free usage for commercial programs as stated in the UPX License Agreement.
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