OptiPNG: Advanced PNG Optimizer
is a PNG optimizer that recompresses image files to a smaller
size, without losing any information. This program also converts external
formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity
checks and corrections.
If you wish to learn how PNG optimization works, or to know about other
similar tools, see the PNG-Tech article
A guide to PNG optimization
See the Security Information section below.
You are strongly encouraged
to upgrade to the latest version
Here is a list security-sensitive issues that affect the previous versions:
Henri Salo and Hans Jerry Illikainen reported two vulnerabilities in the
compressed BMP decoder, discovered by using the
American Fuzzy Lop.
All versions prior to 0.7.6 that support compressed BMP files
(i.e. from version 0.6
to version 0.7.5) are affected.
Gynvael Coldwind and Mateusz Jurczyk reported a use-after-free vulnerability
in the palette reduction code, affecting the versions
partially fixed in version
and fully fixed in version
OptiPNG is open-source software, released under the zlib license.
The contributing authors, i.e. the people who contributed source code to OptiPNG.
The program revision history and the acknowledged contributors.
Last updated: 2016-Apr-04