From Free Software Directory
Jump to: navigation, search


Advanced PNG optimization program

Losslessy make PNG images smaller and check their integrity.

OptiPNG can also convert BMP, GIF, PNM and TIFF to PNG.


A guide to PNG optimization

Related Projects


LicenseVerified byVerified onNotes
Zlibsyntecn21 August 2014
Please note that in addition to optipng, the source code for this program also comes with several other libraries: gifread, libpng, minitiff, opngreduc, pngxtern, pnmio, zlib. The licenses for each of these library are either zlib or a similarly permissive license; the copyright on these other libaries are different than the copyright on the optipng source files alone.

Leaders and contributors

Resources and communication

Software prerequisites

This entry (in part or in whole) was last reviewed on 21 August 2014.


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.