A free app for Android, by Mobsnake.

Vertical Gallery combines the features of a phone gallery and a photo-editing app. With this app, you can crop photos to your desired size and use filters to beautify your snapshots. You can also copy or move files for easy organization and even hide certain folders for your privacy. 

Interestingly, It is also a video editing application, though it only lets you trim or mute video files. Hence, it may not be ideal for full-blown video editing. But if you want to play videos, you may do so in the app. This tool is not ad-free unless you purchased an item from Vertical Gallery,