Versions tested: 0.36c
Optimal parameters: -mx -a -15m
Authors: Damien Debin
Algorithms: BWT+MTF
Notable peformances: -


Zzip, a new compression tool still under development, can compress files with a very high compression ratio. Compared to WinZip 7.0, you can gain, at least, 15 %. Zzip has a lot of useful features (like support for file integrity tests, built-in multimedia detection/compression...).

With Zzlib, you can also use Zzip as a library (dll) in one of your program.

Source code of Zzip/Zzlib is released under the GNU LGPL.

Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developed by Mike Burrows and David Wheeler. Here are the different steps :

former website

  Switch picks:

-mx gives the best compression ratio but compression is 15% slower

-a is useful with binary or tar files, it reduces the block size adaptively to give a better compression ratio, but compression is 5% slower

-mm enables a special algorithm for image and wav files, use it only for multimedia files since it can give a worse compression ratio for regular files

the program documentation


The program has following filters (quotes from the source code):

* Some phrase replacements.
This replaces the following phrases with single byte codes: the, you, for, and, hav, he, nd.
* some ASCII transformations: alphabet reordering, carriage-return tagging, upper-case letter tagging

The compressor is featured in the BWT comparison.

(Have info that should be added here? E-mail.)

Configuration '-a -16m' fails verify check on Game2.

Qualified configurations
Ver Rating CPR DPR S.E. R.E. Ratio C. kB/s D. kB/s
-mx -a -15m
0.36c 4 5 1 19 0 3.009 1375 5403

Version info

0.36c, tar: no, mode: 32-bit, crc32: ca859398, decoder: 23 kB, tested: 2010 Apr 21
compression: zzip.exe a -r <args> <cfile> <src>
decompression: zzip.exe x <cfile>