Install gif2png by entering the following commands in the terminal:
sudo apt update sudo apt install gif2png
Description:
GIF -> PNG conversions
This program can convert GIF images to PNG images. It also contains the script "web2png" which converts entire websites from GIF to PNG and updates the HTML accordingly.
Homepage: http://www.catb.org/~esr/gif2png/
Version: 2.5.8-1build1
Section: universe/graphics