The PNG image format allows for information that is not nesaccerily relevant to the image itself. For example, some textual information might be stored in the iTXt, tEXt, and zTXt chunks. However, these text chunks do not define the image itself and can be safely deleted, and thus to reduce the file size.
PNG Optimizer removes all unnecessary chunks to reduce the image size without affecting the image quality.
PNG Optimizer is open source under the MIT LIcense.
The attached binary files are for Windows (pngc.exe) and Linux (pngc).
Please visit the project page to find out more:
http://CharmySoft.com/app/pngc
Developed by CharmySoft:
http://CharmySoft.com