Using the "Flag Overlay Picture Tool" you can easily overlay your picture with a country flag using the three steps below:
Once you've completed the 3rd step, you will be redirected to the download page where you will download your picture. Unlike other similar tools, Flagmypicture.com does not require you to login via Facebook, Twitter or Google+, yet you will be able to upload your flag overlaid picture to any social network or forum manually. After uploading your picture you can set it as a profile picture, cover photo or avatar as you normally would any other picture.
Note that in step 2, you can set the opacity level (flag transparency level). The opacity level determines how dark the flag should be. In other words, the higher the opacity level is, the less visible the picture behind it will be. We've tested different opacity levels and have come to the conclusion that 30% works best with all flags because if set too high, the picture that the flag lays over isn't visible enough in our opinion. However, if you feel that the flag isn't visible enough, you can adjust this level to your liking.
For more information, you can watch the video below: