Gzip
file compression program
gzip is a file format and a file compression program. The program uses the Deflate algorithm to compress and decompress a single file using the gzip file format.
gzip was released in 1992 as a free software replacement for the compress program because its compression algorithm, LZW, was covered by patents from Unisys and IBM, which did not expire until 2003 and 2004. Jean-Loup Gailly designed the gzip file format, which was later specified by RFC 1952, and originally wrote the gzip program. Mark Adler wrote the decompression part. gzip is now developed by the GNU project.
As the file format can be decompressed via a streaming algorithm, it is commonly used in stream-based technology such as Web protocols, data interchange and ETL (in standard pipes).
File format
A gzip file (described in the table below) consists of a 10-byte header, optional extra header fields, Deflate-compressed data, and an 8-byte trailer.
Although multiple streams may be concatenated (gzipped files are simply decompressed concatenated as if they were originally one file), normally only a single file is compressed. Compressed archives are typically created by assembling collections of files into a single tar archive (also called tarball), and then compressing that archive with gzip.
The public source identifies “Gzip” as file compression program. This brief keeps that definition visible, then builds a research path around Gzip, file and compression.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Gzip”, the useful work is to connect “file compression program” to the records capable of establishing context and consequence.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 4, 2026. The linked authority identifier is Q283647. 2 of 3 selected statements include explicit references; 2 carry qualifiers and 1 use preferred rank. The first chronological checks are 1992, 2003, 2004 and 1952.
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This entry incorporates text from “Gzip” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.