You can fit a photo to square with this app and blur background with the photo.

-- How to use.
1. Select a photo.
2. Tap the photo to show editing menu.
3. Drag & Pinch the photo to move and change size.
4. Tap Backdrop to show editing menu and blur it.

-- Blur type
- Blur
- Black & White
- Black & White with Blur
- Blue Print
- Blue Print with Blur
- Dots

Usually SooPic iOS app used & searched for

squareready for video, sqaure ready, blur background, blur background video, square blur, sqare ready, blur text, square size, image sizer, image size, video sizer, square fx, sqaure size, square size video, and other. So, download free SooPic .ipa to run this nice iOS application on iPhone and iPad.