Jpeg.io is a free online application that allows you to quickly and easily convert your images into the optimized JPEG format using Kraken.io's JPEG optimization algorithms. Jpeg.io supports the most common image formats: JPG, PNG, GIF, SVG, BMP, EPS, PSD, TIFF and WEBP.
To use it, just drag and drop your images into the space provided for that purpose and a few seconds later you get compressed JPEG images in the smallest size possible, but without noticeable quality loss. You can then download the images converted individually or together in a ZIP archive.
It is also possible to import your images from online services like Dropbox, Box and Google Drive.
link : Jpeg.io