What is pngquant?
Pngquant is a library for compressing PNG images. It is used by many tools and websites to compress and optimize PNG files. PNGShrink for OS X uses this same library so you can optimize batches of PNG files in an easy and fast way without having to upload them to somewhere.
Do I need to upload my PNG files?
No. The optimization is done on your own Mac. This means optimization is not only much faster, it also guarantees privacy, security and non-disclosure of your (or your customers) content.
Does PNGShrink overwrite my original files?
No. You select a target folder and the optimized files will be stored there. Your original images will remain the same.
What does this app do?
PNGShrink for OS X can batch process PNG images, decreasing their file sizes, keeping transparency and quality. More information.