https://robinoptimizer.com/

Make your website faster by reducing the weight of images. Our WordPress image optimizer plugin can cease image weights on 80% without any loss of quality. Robin image optimizer is a smart and advanced image optimizer that really stands out among other WordPress plugins. Robin image optimizer is a WordPress free image optimizer plugin with zero limitations in terms of number of images and optimization quality. The only thing that you may stumble across is the image weight, which shouldn’t exceed 5 MB.