I love it when I post a reply and Weasyl's servers decide not to post it... Attempt #3.
Yes, JPG or JPEG is a lower quality image compression file type. I save all my work in PNG, which is a much higher quality and thus had to convert over 300 images to JPG format before I could upload to WebToon.
Link
Something-wild-inside
what is JPG? as in the file type?