Photo grid is one of the best collage editor I have used. It works very well. It works on both, windows as well as android. Best thing about this editor is that it has several collections of collages. You can easily choose which one you can use to make your DP more attractive than before. One more best thing is that UPDATED VERSION of PHOTOGRID has few creative effects too. So, now you can also apply some creations to your pictures too. I’m using this software for 7 months and till now there is no problem in it. So, you can say that it’s a genuine product.
Must try it once.