Deflate

This article is about the compression algorithm. For other uses, see Deflation (disambiguation).
Deflate
Developed byPhil Katz, PKWare
Initial release21 August 1990 (1990-08-21)
CompressionLZ77, Huffman coding
StandardRFC 1951
Open format?Yes
Free format?Yes
Websitepkware.com

In computing, Deflate (stylized as DEFLATE, and also called Flate) is a lossless data compression algorithm that uses a combination of LZ77 and Huffman coding. It was designed by Phil Katz, for version 2 of his PKZIP archiving tool. Deflate was later specified in Request for Comments (RFC) 1951 (1996).

Katz also designed the original algorithm used to construct Deflate streams. This algorithm received software patent U.S. patent 5,051,745, assigned to PKWare, Inc. As stated in the RFC document, an algorithm producing Deflate files was widely thought to be implementable in a manner not covered by patents. This led to its widespread use. For example, in the zlib data format, gzip file format, Portable Network Graphics (PNG) image file, ZIP file format for which Katz originally designed it. The patent has since expired.


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