Animated GIF's can be lossless optimized with GIFsicle. I went looking for something similar for APNG and found apngopt. http://sourceforge.net/projects/apng/f

Animated GIF's can be lossless optimized with GIFsicle. I went looking for something similar for APNG and found apngopt. http://sourceforge.net/projects/apng/files/APNG_Optimizer/ http://sourceforge.net/projects/apng/files/APNG_Optimizer/ Think of it as pngcrush for each animation frame. Also, it can leverage Google's Zopfli implementation of DEFLATE, which produces much smaller output than zlib's implementation. I haven't seen any other lossless optimization tools using Zopfli, so that's pretty cool. (update: actually it looks like recent versions of advpng can use Zopfli) Also, some good comparisons of APNG vs. GIF vs. WebP animations are here: http://littlesvr.ca/apng/gif_apng_webp1.html http://littlesvr.ca/apng/gif_apng_webp1.html