So I have a folder which contains around 300 png files and I want to convert all of them to jpg files

Question

i have a access to a Ubuntu server and a macOS installation

I've searched only but haven't found anything

Answer 1

install imagemagick and rename

sudo apt install imagemagick rename

go in the folder to be safe

cd /dir/with/pngs

convert them all in a for/do/done loop

for png in $(ls -1 *.png); do
   convert "$png" "${png/png/jpg}"
done

You win one million fire emojiis.