||This article needs additional citations for verification. (November 2010)|
|Initial release||August 1992|
|Stable release||3.00 / 7 July 2008|
|Preview release||3.1c / 29 June 2010|
|Original author(s)||Samuel H. Smith|
|Initial release||3 March 1989|
|Stable release||6.0 / 29 April 2009|
|Preview release||6.10b / 10 December 2010|
|Stable release||5.03 / 11 March 2005|
|Operating system||Windows 3.1 and later|
|Platform||Intel x86 - 32-bit; Alpha AXP (Windows NT series only)|
|Stable release||1.06 / 22 February 2001|
|Operating system||Mac OS Classic 7 or later|
|Platform||Motorola 68020 or later; PowerPC|
Info-ZIP is a set of open-source software to handle ZIP archives. It has been in circulation since 1989. It consists of 4 separately-installable packages: the Zip and UnZip command-line utilities; and WiZ and MacZip, which are graphical user interfaces for archiving programs in Microsoft Windows and classic MacOS, respectively.
Info-ZIP's Zip and UnZip have been ported to dozens of computing platforms. The UnZip web page describes UnZip as "The Third Most Portable Program in the World", surpassed by Hello World, C-Kermit, and possibly the Linux kernel. The "zip" and "unzip" programs included with most Linux and Unix distributions are Info-ZIP's Zip and UnZip.
In addition to the Info-ZIP releases themselves, parts of Info-ZIP, including zlib, have been used in numerous other file archivers and other programs. Many Info-ZIP programmers have also been involved in other projects closely related to the DEFLATE compression algorithm, such as the PNG image format and the zlib software library.
The UnZip package also includes three additional utilities:
- fUnZip extracts a file in a ZIP or gzip file directly to output from archives or other piped input.
- UnZipSFX is software to make a ZIP file into an executable self-extracting archive.
- ZipInfo outputs, in a variety of formats, information about ZIP files and their contents.
The Zip package includes three additional utilities:
- ZipCloak adds or removes password encryption from file in a ZIP archive.
- ZipNote allows the modification of comment fields in ZIP archives.
- ZipSplit splits a ZIP archive into sections for separate disks or downloads.
UnZip 2.0 (September 1989) was released by Samuel M. Smith. It included support for the "unimploding" (method 6) introduced by PKZIP 1.01. George Sipe created Unix version.
UnZip 2.0a (December 1989) was released by Carl Mascott and John Cowan.
UnZip 3.0 (May 1990) became the first public release by Info-ZIP group.
UnZip 4.0 (December 1990) adds support of "central directory" within .ZIP archive.
In 1994 and 1995 Info-ZIP turned a corner, and effectively became the de facto ZIP program on non-MS-DOS systems. A huge number of ports were released that year, including numerous minicomputers, mainframes and practically every microcomputer ever developed.
UnZip 5.41 (April 2000) was relicensed under Info-ZIP License.
Zip 3.0 (2008-07-07) supports ZIP64 .ZIP archive, more than 65536 files per archive, multi-part archive, bzip2 compression, Unicode (UTF-8) filename and (partial) comment, Unix 32-bit UIDs/GIDs
WiZ 4.0 (November 1997) was released by Info-ZIP.
WiZ 5.01 (April 2000) was relicensed under Info-ZIP License.
MacZip 1.05 (July 2000) was released under Info-ZIP License.
MacZip 1.06 was released in February 2001. It was written by Dick Hasse.
See also 
- Roelofs, Greg (2008-07-08). "Info-ZIP Home Page". Retrieved 2010-11-16.
- Hasse, Dirk (2006-04-25). "Zip for Macintosh". Retrieved 2010-11-16.
- Roelofs, Greg (2009-09-10). "Info-ZIP's UnZip". Retrieved 2010-11-16.
- Roelofs, Greg (2008-10-04). "Info-ZIP: More Stuff". Retrieved 2010-11-16.
- Spieler, Christian (2002-02-17), "UnZip, version 5.5, 17 February 2002", UNZPHIST.ZIP (Info-ZIP)
- "README", Zip, 6.10a (Info-ZIP), 2010-08-13
- "WHATSNEW", Zip, 3.1c (Info-ZIP), 2010-06-20