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Can you recommend the best or all of the best executable (EXE) compressors out there? It can either be free or paid. Also it can be publicly well known or even just a new compressor but seem to offer quite a punch.

I'm aiming for file size as I'm asking this question. Meaning the smaller the file size it can produce, the better.

Feel free to list as many as you want (with links please). I'll be more than happy to try each of them. :)

A: 

My favorite is UPX

*   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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RRUZ
I'm quite familiar with UPX as well but I find it rather concerning that most malware / viruses gets compiled using UPX which in turn raises false positives on some of my apps compressed by it. Now of course, computer savvy people can incur if the file being detected is malware or not but sadly, not all people are like that. Some people who receives a flag from their antivirus, be it just a warning or not, tend to think that that file/program is already malware. :(
Shedo Chung-Hee Surashu
+1  A: 

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.

Forget any other. "There is" just UPX, don't waste time seeking for other.

clrod
A: 

Well, Obviously UPX.

Other Alternatives include ASPack (pretty good.)

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