The "Blurry Photo Editor" is a wonderful app to post full-size pictures on Instagram. It makes your photos look great by blurring the background. And you can do it in no time.

It’s easy to use. First, choose a photo from your device. Then, just tap on the "Blurry Photo Editor" icon, and it will automatically blur the background. You can choose any blur level you want. And you can also change the blur style.

It has a simple interface, so you won’t have to spend much time learning how to use it. And it’s free. So, there’s no need to spend any money.