Crop Photos in the Windows 8.1 Photos App
Change the aspect ratio if desired.
If you’re planning on printing your photo or displaying it at a certain size, click the Aspect Ratio button from the bottom menu. There, you can select your photo’s frame size. Choose Square, for example, to fit a square frame. Choose Widescreen to make your photo fill a widescreen TV. Choose Lock Screen to use a photo as your PC’s lock screen. Each choice places a differently sized square over your photo to fit your new choice’s dimensions. To compensate, drag the square’s corners inward or outward and reposition your subject in the crosshairs.