A free app for Android, by Palmera Labs.

This application allows you to choose and apply any sticker to your pictures and selfies, including the flags of the world’s countries. The app also offers you the chance to choose a photo from your camera roll or take one with your phone’s camera. The sticker will then appear on the photo, ready for you to drag and zoom in or out as you wish.

This application is useful for people who want to share a particular photo or pose with their friends. The stickers are available in 4 different sizes, and you can change the position of each one by simply dragging it. The app also offers you the option to save the stickers in the photo, so you can use them later on.