Tiny SEO Speed Image Optimizer

I really am happy with the TinyIMG app was very very easy to install and use. Simplest app I ever used on Shopify with great results - it optimized my product images and reduced 38 MB within minutes. And it was a super painless way to get Alt tags on all my product images at the same time! Also I should the customer support was very good and helpful and checked in with me to see how I was doing. Very helpful.