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what are gz files

PeaZip is a free cross-platform gz file archiver 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, 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:
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What are GZ files, Gzip compressed format



GZ extension



GZ extension designates a single file compression format, created for GZip (GNU Zip or "gratis Zip") project, started in 1992 by Jean-Loup Gailly and Mark Adler in order to provide a free replacement for proprietary / commercial data compression solutions.
Compression is based on DEFLATE algorithm (also used as default algorithm in PKZip/WinZip's .ZIP format), a combination of Lempel-Ziv coding (LZ77) and Huffman coding.

7-Zip (and PeaZip, which handles zip and gzip files through Open Source 7-Zip / p7Zip binary backend) use an custom optimized DEFLATE implementation producing better compression ratios than standard reference DEFLATE implementation, keeping full compatibility with other compression utilities working on .gzip files, but using more processor time (gzip compression and extraction is however very fast, and CPU/RAM-light, for today's machines capabilities).

PeaZip has full support for GZip standard, including compression, listing, testing, and extraction. Read also: how to create and open GZ files

what is a gz file

what are gzip files

gzip files

When it is recommended to use GZ format: GZip is usually employed for compressing TAR packages on Linux and other Unix-like systems.

gz files

Gzip's GZ file format lacks file archiving feature - it can compress each single file, but cannot consolidate multiple input file in a single (compressed) container archive - for that reason it is commonly used on Unix/Linux world to compress TAR archives (as well as BZip2, lzma / XZ,...) - archiving format which can consolidate multiple files in a single package and preserve filesystem information (file attributes, date/time etc), but lacks compression capabilities - producing TGZ file (if single file extension convention is used), alternatively identified by TAR.GZ extension if multiple file extension convention is used.

Read more about .gz extension: GZipGzip wiki compression program and GZ file type page on Wikipedia, and on GnuZipGzip compression program domain.

  



  

.GZ

Authors: Jean-Loup Gailly, Mark Adler, 1992
limited to 1 single file as input

SPEED gz format specifications

GZ format features very high speed, due fast and lightweight compression algorithm, not encumbered by extra features.







COMPRESSION RATIO gzip deflate algorithm

GZ compressed files features low compression ratio. GNUZip employs a classic Deflate file compressor, comparable to ZIP and PEA, but inferior to BZip2 or modern compressors as 7Z and RAR format.

ADVANCED OPTIONS GZ format features
GZip standard is meant only to provide single file compression, other features including archival are out of its scope.








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FAQ > Archive file types > What are GZ files and GZip Deflate compression

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