Step one: Install the Morphin app on your Android or iOS smartphone and then sign-up by using either your Facebook or Google account. Once you have signed up you’ll find some pre-exixsting GIF options that are available, along with a hamburger menu on the top right of the app, click on that menu.
Step two: click on the faces icon, and then tap on the “+” icon you see below. Then, find a well-lit environment with white a background and click a selfie of yours, just ensure that your niether smilling nor frowning. Now, go to the mainscreen of the app and select the Avenger GIF which you want to put your face on. While the GIF is being processed, the app will engage you by asking some trivial questions.
Step three: Once the GIF has been sucsessfully processed, you will be able to download your GIF which you can easily save on your phone or directly share on some of your social networking accounts.
The app also lets you add text to your GIFs, Also in this app you can make lots of GIFs other than just Avengers characters.
You can download the android version of the app here