What are soma apps to crop something out?

I need to crop something out of a picture. Any free apps for iphones?

Added (1). NOt to make the picture smaller, but to take something out of the center of it

Go to your photo gallery, click edit and you'll see some thing like a square on the most bottom right hand corner, that's for cropping.
Other apps:
Photoshop
Typic
Pic collage

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