Compression

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== Stream compression formats ==
 
== Stream compression formats ==
  
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A stream format takes a stream of bytes, and outputs a different, hopefully smaller, stream of bytes. These compression formats are often used internally in other data structures to compress data, as well as in network protocols, such as http. Used stand-alone, a stream compression format does not offer archiving capability, however in the UNIX doctrine, an archiver like [[tar]] can be combined with an archive format to produce a proper compressed archive.
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A stream format takes a stream of bytes, and outputs a different, hopefully smaller, stream of bytes. These compression formats are often used internally in other data structures to compress data, as well as in network protocols, such as http. Used stand-alone, a stream compression format does not offer archiving capability, however in the UNIX doctrine, an archiver like [[tar]] or the more archaic variant [[shar]] can be combined with an archive format to produce a proper compressed archive.
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* [[gzip]] (.gz)
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* [[bzip2]] (.bz2)
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* [[LZ4]]
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* [[LZMA Alone|LZMA_Alone]] (.lzma)
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* [[pack (Unix)]] (.z)
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* [[XZ]] (.xz)
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* [[Zstandard]] (.zstd)
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** [[Zstandard dictionary]]
  
 
== Compression algorithms and compressed data formats ==
 
== Compression algorithms and compressed data formats ==
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* [[InstaCompOne]]
 
* [[InstaCompOne]]
 
* [[Lempel–Ziv–Stac]] (LZS)
 
* [[Lempel–Ziv–Stac]] (LZS)
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* [[LZ4]]
 
 
* [[LZ77]]
 
* [[LZ77]]
 
* [[LZ77 with Huffman coding]]
 
* [[LZ77 with Huffman coding]]
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* [[Snappy]] (Google-created compression also used by Apple in iWork formats)
 
* [[Snappy]] (Google-created compression also used by Apple in iWork formats)
 
* [[zlib]]
 
* [[zlib]]
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* [[Zstandard]] (Zstd)
 
−
** [[Zstandard dictionary]]
 
  
 
=== Graphics compression ===
 
=== Graphics compression ===
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* [[BWTC32Key]] (.B3K)
 
* [[BWTC32Key]] (.B3K)
 
* [[bzip]] (.bz)
 
* [[bzip]] (.bz)
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* [[bzip2]] (.bz2)
 
 
* [[BZip3]] (.bz3)
 
* [[BZip3]] (.bz3)
 
* [[CAZIP]]
 
* [[CAZIP]]
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* [[DitPack]]
 
* [[DitPack]]
 
* [[DUPA]] (Amiga FileImploder Clone)
 
* [[DUPA]] (Amiga FileImploder Clone)
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* [[EBZ|EBZip]] (.ebz)
 
* [[EDI Install archive]]
 
* [[EDI Install archive]]
 
* [[EDI Install packed file]]
 
* [[EDI Install packed file]]
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* [[FlySpeed st/exp]]
 
* [[FlySpeed st/exp]]
 
* [[Freeze/Melt]] (Unix) (.F)
 
* [[Freeze/Melt]] (Unix) (.F)
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* [[gzip]] (.gz)
 
 
* [[Hammer (compression)|Hammer]]
 
* [[Hammer (compression)|Hammer]]
 
* [[HAP]] (v2.x)
 
* [[HAP]] (v2.x)
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* [[JCalG1]] (.jc, Commodore Amiga)
 
* [[JCalG1]] (.jc, Commodore Amiga)
 
* [[Kboom11]]
 
* [[Kboom11]]
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* [[Logitech Compress]]
 
* [[lrzip]] (.lrz)
 
* [[lrzip]] (.lrz)
 
* [[LZ5 and Lizard]]
 
* [[LZ5 and Lizard]]
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* [[LZHUF]]
 
* [[LZHUF]]
 
* [[Lzip]] (.lz)
 
* [[Lzip]] (.lz)
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* [[LZMA Alone|LZMA_Alone]] (.lzma)
 
 
* [[lzop]] (.lzo)
 
* [[lzop]] (.lzo)
 
* [[LZS221]]
 
* [[LZS221]]
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* [[NRV (Not Really Vanished)]]
 
* [[NRV (Not Really Vanished)]]
 
* [[Oodle Data Compression]]
 
* [[Oodle Data Compression]]
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* [[pack (Unix)]] (.z)
 
 
* [[PGNPack]]
 
* [[PGNPack]]
 
* [[PowerPacker]] (.pp)
 
* [[PowerPacker]] (.pp)
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* [[sfArk]]
 
* [[sfArk]]
 
* [[SFDN Packer]]
 
* [[SFDN Packer]]
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* [[SFPack]]
 
* [[SHARC]] (density)
 
* [[SHARC]] (density)
 
* [[Softdisk Text Compressor]] (.ctx)
 
* [[Softdisk Text Compressor]] (.ctx)
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* [[WWPACK]]
 
* [[WWPACK]]
 
* [[XPK]]
 
* [[XPK]]
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* [[XZ]] (.xz)
 
 
* [[Yaz0]]
 
* [[Yaz0]]
 
* [[zchunk]]
 
* [[zchunk]]
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* [[DIET (compression)|DIET]]
 
* [[DIET (compression)|DIET]]
 
* [[Diet Disk]]
 
* [[Diet Disk]]
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* [[DiskDoubler]]
 
* [[Pack-Ice]]
 
* [[Pack-Ice]]
 
* [[SLIM (Dominic Herity)|SLIM]]
 
* [[SLIM (Dominic Herity)|SLIM]]
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(Transparent disk compression software and the like, excluding filesystem formats.)
 
(Transparent disk compression software and the like, excluding filesystem formats.)
  
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* [[DiskDoubler]]  
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* [[DoubleDisk]]
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* [[DriveSpace]] and DoubleSpace
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* [[DoubleSpace and DriveSpace]]
 
* [[JAM (disk compression)]]
 
* [[JAM (disk compression)]]
 
* [[Stacker]]
 
* [[Stacker]]
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* [[SuperStor]]
  
 
For filesystem formats that feature compression, see [[Filesystem]] (especially [[Filesystem#Compressed filesystems]]).
 
For filesystem formats that feature compression, see [[Filesystem]] (especially [[Filesystem#Compressed filesystems]]).
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== Links ==
 
== Links ==
 
* [http://boingboing.net/2014/03/04/data-compression-with-playing.html Data-compression with playing cards]
 
* [http://boingboing.net/2014/03/04/data-compression-with-playing.html Data-compression with playing cards]
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* [http://www.quora.com/What-is-the-most-compressed-file-ever/answer/Kelly-Martin?srid=uejz&share=1 What is the most compressed file ever?]
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* [https://web.archive.org/web/20201108101659/https://bestofquora.wordpress.com/2014/06/14/what-is-the-most-compressed-file-ever/ What is the most compressed file ever?]  
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* [http://ieeeghn.org/wiki/index.php/History_of_Lossless_Data_Compression_Algorithms History of Lossless Data Compression Algorithms]
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* [https://ethw.org/History_of_Lossless_Data_Compression_Algorithms History of Lossless Data Compression Algorithms]
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* [https://www.mattmahoney.net/dc/dce.html Data Compression Explained - Matt Mahoney]

Latest revision as of 08:37, 16 August 2025

File Format
Name Compression
Ontology

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Contents

[edit] Stream compression formats

A stream format takes a stream of bytes, and outputs a different, hopefully smaller, stream of bytes. These compression formats are often used internally in other data structures to compress data, as well as in network protocols, such as http. Used stand-alone, a stream compression format does not offer archiving capability, however in the UNIX doctrine, an archiver like tar or the more archaic variant shar can be combined with an archive format to produce a proper compressed archive.

[edit] Compression algorithms and compressed data formats

(excluding formats usually used as file formats)

[edit] Graphics compression

See Graphics#Compression for compression formats used primarily with graphics.

[edit] Specific file formats/programs

(multi-file compressors are in Archiving)

[edit] Transparent file compression

(A mostly-obsolete technique in which a background process hooks into the OS and decompresses files transparently when they are read. Compression might be done manually. The line between this and Disk compression can be blurry.)

[edit] Disk compression

(Transparent disk compression software and the like, excluding filesystem formats.)

For filesystem formats that feature compression, see Filesystem (especially Filesystem#Compressed filesystems).

[edit] Executable compression

See Executable compression.

[edit] See also

[edit] Links

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