GIF to Animated PNG converter
You can also use: http://ezgif.com/gif-to-apng?url=http://link/to/image.gif
Output PNG image:
GIF to APNG converter
Convert animated GIF to animated PNG with one click.
Keep in mind, animated PNG is not supported by all major browsers. It's PNG is supported by Mozilla Firefox and Apple Safari browsers. Support for Google Chrome is currently in development.