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Lossy PNG compressor

Significant PNG file size reduction using quantization algorithms.

Pngquant is capable of preserving full alpha transparency.


Download version 2.3.0 (stable)
released on 11 July 2014

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LicenseVerified byVerified onNotes
License:BSDsyntecn21 August 2014
Please note that in addition to pngquant, this source code comes with the libimagequant library. The license for this library is also BSD; it is currently under the same copyright as pngquant.

Leaders and contributors

Resources and communication

Software prerequisites

Required to buildlibpng (1.5 or later)
Required to buildzlib


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.