Compression Algorithm

This is a simple implementation of the famous LZW algorithm.

YAWICA stands for Yet Another Wavelet based Image Compression Algorithm, it is the result of my diploma thesis. This source code is for educational purposes only and not for any commercial application. So it is neither optimized for speed nor does it accept other image material than PGM images...

LZ77 is a compression algorithm upon which most popular compression formats are based; PKZIP, GZIP, LHA, RAR, etc. This script allows you to compress blocks having the size of maximum 256 bytes.


Platforms: Windows, Mac, *nix, Python, BSD Solaris

PowerPAQ will be GUI application that will use strenght of GPL-licensed PAQ compression algorithm. This algorithm is slow but extremely powerful.First, windows version will be out. Next step is Linux GUI version.


Platforms: *nix

HTMLZip is a utility to creating compressed and protected html pages. True compression algorithm provides a size reducing to 20%-70% of original. JavaScript is used for extracting in the browsers (no third-party software). It is a simple tool to protect source of your html pages. See example at:...

WillowTree Data Safe is a zip tool that incorporates 256 bit AES encryption into it's compression algorithm. With it you may archive entire folders and encrypt them using the built in encryption algorithm. Also compatible with standard zip archives. Plus, it can convert its own or other zip...


Platforms: Windows

WDP is a kind of image format for Windows Media Photo or Microsoft HD Photo created by Microsoft to improve compression algorithm based on JPG/JPEG. WDP Converter is a tool to convert, resize, rotate, flip, preview wdp format (Windows Media Photo or Microsoft HD Photo). It can convert WDP to...


Platforms: Windows

IMA ADPCM is an extremely simple audio compression algorithm that achieves pretty good sound quality at 4-bits per sample (352kbps for 44100khz CD audio). It was used in a lot of games up until the year 2000. Full source is included, and it has a straight-forward API. Maybe someone will find it...


Platforms: Mac

Ext2 compression extension (E2compr) is a small patch against the ext2 filesystem that allows on-the-fly compression and decompression. It compresses only regular files; the administrative data (superblock, inodes, directory files etc.) are not compressed (mainly for safety reasons). Access to...


Platforms: *nix

Samplify for Matlab allows sampled data users (those capturing real-world samples from A/D converters, or sending samples to D/A converters) to compress these samples in one of three compression modes:a) SignalZIP (TM) lossless mode,b) Samplify fixed-rate mode (users specify the desired...


Platforms: Matlab

Lzip is a lossless data compressor based on the LZMA algorithm, with very safe integrity checking and a user interface similar to the one of gzip or bzip2. Lzip decompresses almost as fast as gzip and compresses better than bzip2, which makes it well suited for software distribution and data...


Platforms: Mac, Linux

The lzlib compression library provides in-memory LZMA compression and decompression functions, including integrity checking of the uncompressed data. The compressed data format used by the library is the lzip format. The variables and functions forming the interface of the compression library...


Platforms: Mac

HTML Compact is a powerful HTML compression tool created for webmasters and website owners. Its effective compression algorithm can reduce the size of your pages by as much as 80% while keeping the appearance of the pages the same. When implemented, the documents will be uncompressed in the...


Platforms: Windows

XZ Utils is free general-purpose data compression software with high compression ratio. XZ Utils were written for POSIX-like systems (GNU/Linux, *BSDs, etc.), but also work on some not-so-POSIX systems like Windows. XZ Utils are the successor to LZMA Utils. The core of the XZ Utils compression...


Platforms: *nix

LZMA Utils are legacy data compression software with high compression ratio. LZMA Utils are no longer developed, although critical bugs may be fixed as long as fixing them doesn't require huge changes to the code. Users of LZMA Utils should move to XZ Utils. XZ Utils support the legacy .lzma...


Platforms: *nix

The zziplib library is intentionally lightweight, it offers the ability to easily extract data from files archived in a single zip file. Applications can bundle files into a single zip archive and access them. The implementation is based only on the (free) subset of compression with the zlib...


Platforms: *nix

PhotoSite contains two editing feature sets in one program. The primary application is a web-publishing tool with batch processing capabilities. Users have the ability to create groups of resized digital images as well as a database of albums and categories. PhotoSite's features include: ASP...


Platforms: Windows

Compress PDF file and reduce the actual size of PDF document with this completely free PDF Compressor. Free PDF Compressor removes duplicate PDF objects, optionally takes advantage of new compression features of latest PDF specifications that for many classes of documents compresses 30 - 60%...


Platforms: Windows

The initial view of a PDF document can be tweaked. Is it a secret of PDF file? Well, we are not sure about this, and very few pieces of software can tweak PDF files. With the freeware utility Tweak PDF, you are allowed to set the initial view preferences of a PDF document, such as whether to...


Platforms: Windows

J7Zip handles 7-zip archives. It can lists the contents of the archive, test the archive files, and extract files from the archive to their full paths in the current directory. This version supports only unencrypted archives, and archives with the Copy or LZMA codec. J7Zip can list, test and...


Platforms: *nix