We last featured Image Resizer UWP here, six weeks ago.
The dark theme is forced, by the way, and not just my test phone here picking up a system theme. But dark makes a ton of sense on AMOLED-screens, and looks classier on any phone, in my opinion. Some screens of the new version in action:
The new dark theme. Note that although I've only picked one source image here (to show the last check-box active), you can pick as many images as you like as source and they'll all be manipulated in the same way - they get listed by filename in the dialog above.
Nice to see this improving, even if the UI is still quite basic. You can grab this free UWP app in the Store here.