Instantly remove the background from your photos, free. This free tool from StickerMule does pretty much the same thing as the tool above, but it has slightly different functionality for dealing with the result of removing the background. This is a fairly new release, so the fun social features around it may improve over time. Also worth noting, as with the next StickerMule tool, you will need to create an account to use it. It is free though. And while you are at it you can order some amazing custom stickers.