Tiny SEO Speed Image Optimizer

Julia was very nice and helpful in responding to questions. She also kindly pointed out an issue with my alt text. A nice experience.
The app has functionality that enables you to see the before and after you've optimized to reassure that the quality looks the same. You need to run the optimization to see this and then if you don't like you can easily rollback. I didn't notice any loss of quality so I used the photos with the smaller file size.