UPX is a free, portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks because of in-place decompression.
Reviewing 2.91 Beta (Nov 30, 2006)
Well, about time that someone submitted the 2.9x beta series to FileForum :)
The biggest change in the 2.9x series is the implementation of the LZMA algorithm. What this means is that your files have a MUCH better compression (even better than the --best option).
For testing purposes, I compressed the AutoHotkey compiler executable (AutoHotkeySC.bin) with the --best and --lzma options:
Original Size: 391 KB
--best option: 205 KB
--lzma option: 193 KB
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