Now a days, due to increase in camera image quality, size of image also increases which a large space on your laptops or computer. So as to save space , you can compress images with image optimizer without any quality loss and dimensions.
Image Optimizer is a small size ( 1.22 MB) software. After Installation When ever you right click any image or a folder containing images, an option Optimize This will appear.After clicking it a new folder is created on the same location with optimized images.