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What is ZIP? What can ZIP do for me?
ZIP files to save storage spaceTo put it simply, ZIP allows you to compress files to save storage space. Zipped files take up much less space on hard drives, flash drives, CDs, DVDs, etc.
ZIP files to speed transmission timeIf you want to quickly send files, ZIP makes the job much easier. By compressing the file(s), sending information via email, FTP, etc. is that much easier – the smaller the file, the faster it will reach its destination.
How does ZIP work?When a file is zipped (compressed), all redundant data is replaced by a smaller reference to that data. This allows the file to be reduced in size for easier storage and/or transfer. When that file is unzipped (decompressed), the reference is replaced by the original data so it can once again be read in its original form.
ZIP is losslessZIP is a “lossless” form of file compression – this means that none of the original data is ever lost.
.ZIP file formatThe ZIP file format is a data compression and archive format. Individual files are compressed to reduce their size and then placed in a ZIP archive. ZIP files are usually labeled with a .zip or .ZIP file extension. ZIP is the most popular file format in the world and is utilized by individual users, businesses, and government agencies to efficiently handle and manage files. The .ZIP Application Note is available here.
Founder of ZIPPKWARE founder, Phil Katz , invented the .zip file format in 1986. Phil made the .zip file standard an open standard in 1989.
ZIP software from PKWAREWhile there are many products available today that will zip a file, PKWARE offers both PKZIP and SecureZIP software. PKZIP and SecureZIP will each compress files up to 95%! In addition to the file compression and management capabilities of PKZIP, SecureZIP offers all of the benefits of PKZIP plus strong encryption to protect sensitive information. To download a free 30-day evaluation of our ZIP products, click here.
Unzip softwareAfter a file is zipped, it must be unzipped to access it. PKZIP and SecureZIP will both unzip as well as zip files. For those who need to unzip and/or decrypt files. but do not need to zip them, PKWARE continues to offer its ZIP Reader for free. ZIP Reader will not zip files. To download ZIP Reader, click here.
Self-extracting ZIP filesIf there is a need for a file that can be unzipped without the use of decompression software, a self-extracting zip file can be created. A self-extracting zip file will have a .exe file extension.
Application Note Archives
This page provides a fixed location for APPNOTE reference and change history.
Specific versions of the APPNOTE named within other published specifications are posted here for reference.
To download APPNOTE version 6.2.0, Click Here or copy and paste the following URL into your browser window:
Other Archived Versions:
Thank you for your interest in the Application Note. You will receive an email when updates are made to the Application Note.
ZIP File Format Specification Publication Policy
In order to ensure the interoperability of the .ZIP file format by third party development organizations, PKWARE® remains committed to the periodic publication of the APPNOTE specification. The publication of changes and revisions to this specification will occur on the following schedule:
1 x, y, and z represent the version major, minor and step version.