A free app for Android, by Blur Image Studio.

Blur Background Image – Square instant Fit is an application that allows you to blur the background of your photos and adjust the color and contrast to make them more interesting. It can be used to create square photos and blur the background for Instagram, Facebook, Twitter, and other social media.

If you don’t know how to use this application, it is very easy to use and understand. First, you need to take a photo or choose one from your camera roll. Then, select a photo size that you want to use (the default is the highest resolution). Next, select the blur level and choose the background color.

You can adjust the settings to create the best background blur effect.