A free app for Android, by Solution Cat Ltd.

Cut Out Cut Photo Background is an app that allows you to change the background of your photos, remove unwanted objects from your images, or cut them out completely. This is done in an easy and convenient way, without having to learn how to use a photo editor. 

All you have to do is download this app and use it as you see fit. You can choose from a variety of different backgrounds, including the ones you have on your device, as well as some that you can download from the app’s settings. You can remove any photo background you want, or replace it with a new one.