The value ranges from 1 (lowest image quality and highest compression) to 100 (best quality but least effective compression). Image quality option only works on a few image formats such as JPG, WEBP or AVIF etc. You can use the original image size or select 'Change width and height' option and enter customized image size. Set target image format, image quality and image size.
You can also click the dropdown button to choose online file from URL, Google Drive or Dropbox. Click 'Choose Files' button to select multiple files on your computer.