Yesterday I mentioned I was looking for a way to optimize images for posting via iOS. This morning I discovered that ImageOptim has an API and a corresponding WordPress plugin
Couple that with the S3 offload for images I’m already doing, it’s looking like a nice path towards serving responsible image file weight without a lot of manual twiddling.
Caveat is there is a $9 a month fee, but that coves 1000 optimizations a month. I won’t be posting anywhere near that many images, even if I do it across multiple sites. I’m on the free trial but it’s a bit vague what the trial length is or if there is a certain number of optimizations before the fee kicks in. Then I’ll decide if the efficiency is worth a couple of cups of coffee a month.
Michael, if all you want to do is optimize already uploaded images then I recommend you look at the free tiers of EWWW Image Optimizer (https://wordpress.org/plugins/ewww-image-optimizer/) and Optimus (https://wordpress.org/plugins/optimus/).
Both of these should stand you in good stead. I use EWWW and Optimus’ manual mode to deal with the images on my image heavy site.