You may want to warn that your "convert a folder of images from JPG to PNG in parallel" might crash your machine. I didn't try it myself because I'd rather not

You may want to warn that your "convert a folder of images from JPG to PNG in parallel" might crash your machine. I didn't try it myself because I'd rather not have 230 convert processes running at once … https://www.gnu.org/software/parallel/ https://www.gnu.org/software/parallel/ is the typical solution to this kind of task.