How to convert GIF animations

Just for personal note.
How to convert an animated GIF in to single PNG images?

http://animizer.net/en/gif-apng-splitter

Result: a zip file with every single frame in PNG (or JPG or GIF) format.

And if you want just a single (unique) image with all the frames?

http://commins.ca/gif-to-png-tilesheet/

Then just ‘Save as image’

The online converter gif-to-png-tilesheet seems to be gone…
Now there’s another web service

https://ezgif.com/