Gzip

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|mimetypes={{mimetype|application/x-gzip}}
 
|mimetypes={{mimetype|application/x-gzip}}
 
|pronom={{PRONOM|x-fmt/266}}
 
|pronom={{PRONOM|x-fmt/266}}
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|wikidata={{wikidata|Q10287816}}
 
}}
 
}}
 
'''gzip''' is a compressed file format and command line utility used primarily on Unix-style operating systems, but available cross-platform. It uses [[DEFLATE]] compression.
 
'''gzip''' is a compressed file format and command line utility used primarily on Unix-style operating systems, but available cross-platform. It uses [[DEFLATE]] compression.
  
 
== Identification ==
 
== Identification ==
gzip files begin with two signature bytes: <code>0x1F 0x8B</code>. The third byte indicates the compression method, and is normally <code>0x08</code> (meaning DEFLATE).
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gzip files begin with two signature bytes: {{magic|0x1F 0x8B}}. The third byte indicates the compression method, and is normally <code>0x08</code> (meaning DEFLATE).
  
gzip 0.5 apparently used [[Freeze/Melt]] 1.x format, with signature bytes <code>0x1F 0x9E</code>.
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gzip 0.5 apparently used [[Freeze/Melt]] 1.x format, with signature bytes {{magic|0x1F 0x9E}}.
  
 
== Specifications ==
 
== Specifications ==
 
* RFC 1952
 
* RFC 1952
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== Sample files ==
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* {{DexvertSamples|archive/gz}}
  
 
== Software ==
 
== Software ==
* [http://www.gzip.org/ Original gzip]
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* [http://www.gzip.org Original gzip]
* [http://www.gnu.org/software/gzip/ GNU gzip]
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* [https://www.gnu.org/software/gzip/ GNU gzip]
 
* [[7-Zip]]
 
* [[7-Zip]]
* [http://zlib.net/ zlib]
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* [https://zlib.net zlib]
* [https://code.google.com/p/zopfli/ zopfli] (Gzip-compatible, better compression, but very slow compression)
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* [https://github.com/google/zopfli zopfli] (Gzip-compatible, better compression, but very slow compression)
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* [http://pastebin.com/kYKpfUjd Tiny gzip decompressor without using zlib] (C++)
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* {{Deark}}
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* {{XAD}}
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See also [[DEFLATE#Software]].
  
 
== Links ==
 
== Links ==
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* [http://www.infinitepartitions.com/cgi-bin/showarticle.cgi?article=art001 Dissecting the GZIP format]
 
* [http://www.infinitepartitions.com/cgi-bin/showarticle.cgi?article=art001 Dissecting the GZIP format]
 
* [https://twitter.com/angealbertini/status/534817626342436864/photo/1 Chart of format]
 
* [https://twitter.com/angealbertini/status/534817626342436864/photo/1 Chart of format]
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* [https://stackoverflow.com/questions/20762094/how-are-zlib-gzip-and-zip-related-what-do-they-have-in-common-and-how-are-they/20765054#20765054 How are zlib, gzip and Zip related? What do they have in common and how are they different?] - Response to StackOverflow question by zlib/gzip co-creator Mark Adler
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* [[GZSteg]] - hiding a file within a gzip

Latest revision as of 10:33, 12 April 2024

File Format
Name gzip
Ontology
Extension(s) .gz
MIME Type(s) application/x-gzip
PRONOM x-fmt/266
Wikidata ID Q10287816

gzip is a compressed file format and command line utility used primarily on Unix-style operating systems, but available cross-platform. It uses DEFLATE compression.

Contents

[edit] Identification

gzip files begin with two signature bytes: 0x1F 0x8B. The third byte indicates the compression method, and is normally 0x08 (meaning DEFLATE).

gzip 0.5 apparently used Freeze/Melt 1.x format, with signature bytes 0x1F 0x9E.

[edit] Specifications

[edit] Sample files

[edit] Software

See also DEFLATE#Software.

[edit] Links

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