There are multiple ways to crop multiple photos at once. You can use a free desktop application or try a free online tool that lets you batch crop your images at once. In case you use an image ...
It's quite easy to crop photos on the iPhone, and you have multiple options depending on how you want to crop and edit your image. If you already have photos you'd like to crop on your iPhone ...
You will see pointers at the end of the image to crop the image. In the Picture drop-down list, click This Device. An Insert Picture window will open, choose your picture file and click Insert.