Thread:Undella/@comment-36590121-20200105164142/@comment-36590121-20200105233001

Basically, when an image is uploaded to Fandom, the original image is cached and a new image is made in WebP format, allowing for high-detailed but low-data images to be used on the wiki, and allowing for consistent file format across wikis.

This makes it so that you don't need to convert images from JPG to PNG. You can, but it's not necessary anymore.