A free program for Android, by Appwallet Technologies.

Pic Merger is an amazing app to create the best photo collage for your Android device. It is a very simple and easy-to-use tool that combines multiple photos into a single image. 

First of all, you need to install the app and open it. You can select the images you want to combine and then choose the layout you want to create. 

After you are done editing, you can save the image or share it on social media. You can also crop it to make it the exact size you want. This is an amazing tool for making collages and photos.