As far as posts go, this post is relatively simple. For as far back as I can remember (since I started using my smartphone), Instasize has been my go to collage creator for Android. I have used it since before Instagram allowed larger pictures as well for posting TV and movie screenshots. I have searched for other collage creation apps but found this one to be the most simple and easy to use while getting regular updates. The app is available for Android and iOS. On the Android side, it also keeps it simple to share images to Instagram, save the image to the Gallery as well as access the Android share menu to share to other apps like Facebook, Whatsapp and whichever other app that images can be shared to.