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gz file format

What is GZ file extension, Gzip compressed format

What is gz file format extension
What are GZ files, GNUZip Deflate compression algorithm






GZ file 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.

GZ file format specs

Deflate is obiquitously employed as fast (and light in resources) compression algorithm (as in zlib / PNG lossless compression and Zopfli project), and recently is being surpassed in speed by new actively developed projects as Google's Brotli and Facebook's Zstandard providing either superior compression ratio at high compression levels, and faster, near real time compression and extraction speed at whith lower settings, while retaining a comparable compression ratio to Deflate.

Support for GZip file format

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 vs brotli

When it is recommended to use GZ format: GZip is usually employed for compressing TAR packages (meant for distribution or backup) on Linux and other Unix-like systems.
GZip Deflate excels in fast compression but recent faster alternatives as Brotli and Zstandard are now available and increasily supported.

gzip vs zstandard

What is TAR.GZ file type

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 Brotli .BR, BZip2 .BZ2, LZMA .XZ, Zstandard .ZST...) - 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.




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

SPEED gzip vs brotli vs zstandard

GZ format features very high speed, due fast and lightweight compression algorithm, not encumbered by extra features, so it is ideal to quickly compress large packages or backup.
Modern alternatives as Brotli and Zstandard recently appeared, providing better than Deflate compression / decompression speed at comparable compression ratio.

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.

Synopsis: What is gz file format extension. What are TGZ and TAR.GZ file types. Gzip compression (Deflate algorithm) compared to Brotli, Zstandard for speed and compression ratio. GNUZip compressed files features and specifications.

Topics: GZ file extension

PeaZip > FAQ > What is GZ file extension (Gzip compressed format)


7Z file extension (7-Zip archive format)

BR file extension (Google Brotli compressed format)

BZ2 extension, BZip2 compressed file format

GZ extension, Gzip compressed file format

PAQ, LPAQ, ZPAQ file types

PEA file format specifications

RAR file extension (WinRar archive format)

What are TAR, TGZ, TBZ file types

WIM file extension, Microsoft Windows Imaging format

ZIP file extension

ZIPX file extension (WinZip archive format)

ZST file extension (Facebook Zstandard format)

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