There are all kinds of WordPress Image optimizer plugins available in the WordPress plugin repository. They can help you compress images for the web or handle things like resizing images or lazy loading.

In this post, we’re going to look at the features of the most popular image optimization plugins. Some are all-in-one image optimizers while others have some unique strengths that make them helpful additions, but all of them will help you serve up images on your site much faster.

SmushI don’t want to brag, but Smush is the most popular free image optimization plugin for a reason. It’s the best WordPress image optimizer because it is an all-in-one solution that has lossless image compression, lazy loading, bulk smushing (so you can optimize up to 50 images at once) and more. With over 1+ million active installations, Smush has optimized literally billions of images.

Smush will process PNGs, JPEGS and GIFs on OUR superfast servers, freeing up resources on your server so your site performance will not be affected. And the best part? The free version has no daily, monthly or annual caps so you can optimize to your heart’s content. As long as your images are under 5MB we’ll Smush it.

Read the entire post on WPMU Dev's site