Instagram…. Squaready… android

I want to add a few pics to instagram that I dont wont to be square. I have been told iphone users can use squaready to fill in areas so that a 16:9 or 4:3 image is square. Like this…

But I have a GS2 and squaready is only for iphone.

I have googled and googled to no avail… are there any android apps that will make my rectangular image square? Or how can I do it on windws (quickly and easily)

Many thanks

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