Kraken – Fast & Online Image Optimizer
Minimizing the size of images is an important part of the process for creating faster loading web pages.
We usually play with various variables while saving images to make sure they are optimized like the colors used, file type or quality but there can still be some bytes hidden.
Kraken, a free to use web application, finds those bytes and optimizes the images with a user-friendly interface.
It has support for adding multiple images (up to 20, max 1mb each) via drag 'n' drops, selecting from disk or getting from a URL and quickly uploads + optimizes them.
P.S. The application accepts .JPEG and .PNG files