PAQ family provides maximum compression ratio, with ZPAQ format implementing strongest compression algorithm currently available         
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paq file format

PeaZip is a free cross-platform file archiver and paq files compression utility that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX... free alternative to WinRar, WinZip and similar proprietary software.
- Create 7Z, ARC, BZ2, GZ, PAQ / LPAQ / ZPAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files
- Open and extract ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX files and more,
over 180 archive types supported
Features of PeaZip includes: paq
archives opener and extractor, batch creation and extraction of multiple archives at once, convert files, create self-extracting archives, split and join files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hash and checksum, export job definition as script.

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What is PAQ file compression format



.paq file extension



PAQ is a family lossless file compression algorithms, top ranking in data compression contests like Hutter Prize and holding several records for maximum compressio ratio in those competitions.
PAQ algorithm family is based on multiple stategies to reduce redundancies in data, including neural networks, and aims to reduce compressed size of the data as near as possible to the quantity of information enthropy contained in the input - which cannot be further reduced without loss of information.
LPAQ is a related project form same author, Matt Mahoney, and provides less computing-intensive faster compression, roughly one order of magnitude, at the cost of inferior compression compated to PAQ, but still comparable or superior to mainstream compression formats like 7Z, ARC, RAR, ZIPX at maximum copression settings.
LPAQ is a pure compression format, unlike paq and zpaq, so multiple files needs to be consolidated in a single TAR container before lpaq compression.
ZPAQ designates the current evolution of PAQ/LPAQ project, providing a backward compatible standard format supporting incremental archiving and journaling, and AES256 encryption.
ZPAQ executable is multi threaded, and features a more flexible compression mechanism, ranging from speed / compression ratio tradeoff similar to Deflate for lower compression settings up to better than PAQ for highest compression settings.
See file compression benchmark page to see how ZPAQ compares for compression ratio and speed to strongest compressor algorithms, as LZMA/PPMD employed in 7Z, ARC, RAR and ZIPX formars.

ZPAQ file format

When is PAQ compression recommended

PAQ family is unrivaled in the field of maximum compression, but it is very computing intensive; those formats are recommended when it is desired to effectively reach the best possibile copression ratio.
ZPAQ, being also capable of faster and lighter compression, in the range of Deflate-based formats (ZIP, GZip) is more eclectic and is suitable to be used as general purpose compressor, especially for user-level backup tasks due the built in capability of incremental archiving / incremental backup (add newer and modified files only) and journaling (maintaing multiple copies of modified files).

LPAQ file format

Read more about *PAQ project: PAQ family official domainPAQ data compression software domain, ZPAQ projectZPAQ Incremental Journaling Backup Utility and Archiver, PAQ page on WikipediaPAQ format wiki

PeaZip supports creation and extraction of paq, lpaq, and zpaq files: create, open, browse, test, and extract *paq archives, optionally extract all revision of files contained in the archive, convert any supported archive to paq and zpaq format and vice-versa.

what are paq files

what ia a PAQ archive


  



  

.ZPAQ

Author Matt Mahoney, 2002
2^32 max number of files
250 TB bytes max input size

SPEED paq specifications

ZPAQ is extremely flexible in terms of speed.
The algorithm is very computing intensive as compression level increases, but multithreading support, and several optimizations over its PAQ predecessor, makes it usable for general purpose at least at medium compression levels on current generation machines.
At lower compression settings speed / compression tradeoff is quite similar to Deflate, making it compete with fast archiving formats.







COMPRESSION RATIO zpaq features

ZPAQ compression algorithm provides state of art compression ratio, outperforming even high compression formats like 7Z, RAR, and ZIPX at maximum compression settings

ADVANCED OPTIONS paq specs
ZPAQ format natively supports journaling and incremental archiving / incremental backup, and natively supports AES256 encryption,
Error recovery is currently not supported.








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FAQ > Archive file types > What are Paq, Lpaq, Zpaq files

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