UPX

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. News 08 Sep 2010: UPX 3.07 has been released. It is a minor 3.0x maintenance release to version 3 whose major additions were: * optional LZMA compression * support for BSD systems