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A collection of routines to create and manipulate PNG format graphic images. Designed as a replacement for GIF (and to a lesser extent TIFF) due to functional and patent problems, with more efficient compression (using Gzip-like DEFLATE), support for 24-bit color and alpha transparency.


Online user reference manual available in plain text format from; online user reference manual available in HTML from

Related Projects


LicenseVerified byVerified onNotes
ZlibJanet Casey9 June 2000

Leaders and contributors

Glenn Randers-Pehrson Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking VCS Repository Webview
Help E-mail
Developer,Support E-mail

Software prerequisites

Kind Description
Required to use zlib 1.0.4 (zlib 1.2.5 or later recommended)

This entry (in part or in whole) was last reviewed on 4 December 2004.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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