Compress JPG Images
If you need to optimize the delivery of images to help your site load better it may specify that you need to compress jpg files. Please use Filezilla (on wordpress) to locate your images within the folder on the server.
http docs / wp-content / uploads
Then using http://compressjpeg.com/ upload the images and then compress them by the recommended amount and reload them onto the server (after deleting the existing – may be a good idea to save the previous versions just in case something goes wrong).
Note. for compressing PNG images use http://compresspng.com/