Board Thread:JS Development/@comment-36009152-20190417205533/@comment-27345308-20191020005308

If the only action to be done on an image was converting it to PNG, you would have the option of: However, if you intend to remove the backgrounds of these images alongside converting them, that might be a trickier job. How would the converter know what exactly is the background? If it just turns a specified color transparent, how are you sure the same color doesn't appear in the actual image?
 * Using a batch downloader to download the images you need converted (one probably exists somewhere)
 * Using an image batch converter to convert the images from one format to another (there seem to be many available online)
 * Using a batch uploader to upload the converted images (for example, Wiki-Up)
 * Using a batch delete tool to delete the old images (for example, AjaxBatchDelete)