I have been very impressed with this free app. It's easy to use and very helpful in reducing the storage space on my android phone. The ads are overbearing, but can be overlooked. I recommend this app for others looking for a solution to create more storage space.
Edit- I see. I am updating my rating, but I wish app description was clearer about the fact that it only converts to jpg. Also the location of compressed image should have been clearer. It was the smallest text and in white colour. I completely missed it before.
This app is certainly the best of its class, and I have used many image compressing programs intermittently over the years. I'd like to contribute to the developer's efforts, and switch off ads. However to ask AU$23 dollars per week subscription fee, or almost AU$50 once off is optimistic in the extreme given that most would be using it modestly.
This app and the compressed video app that they make are just amazing. They'll keep the screen running for you in the background. Keep the background processes running and it just gets done with no hassle and it keeps usable space on your phone open