I regularly need to shrink a video to a target size, and this app does the job well. Pick a target size of the video, and this app will quickly produce one close to that size. That said, the app has several annoyances that keep me from giving it five stars. I wrote the developer asking how to pay to fix these annoyances. The developer did not even respond to me, which is unprofessional.
Annoyances:
1. There is no way to remove ads. Ads run well past the point where the X appears on the screen and I must watch every single ad in its entirety. If I am compressing video with people nearby (such as in the office), I must remember to turn down the volume on the iPad before the ad and then turn it back up after the ad. Sometimes there is no way to click out of an ad after it completes, forcing me to exit the app and start over. Let me pay to get rid of the ads.
2. The app forces running in portrait mode. I use an iPad Pro with a keyboard. At this point, I have become somewhat accustomed to reading text sideways and watching ads sideways. Let the app operate in landscape mode.
3. While somewhat minor, the app will not force a download of the video before attempting to compress it. If I shoot a video on the iPhone, then try to compress it on the iPad, I must remember to force a download of the video to the iPad before I try to compress it.
4. Developer will not respond to email. This is just uncool.