How to crop a square at the exact centre of an image in Photoshop?

Question

Given a square image, how can I crop, at the exact center, of the image?

What if the image is not square itself?

What if I'm using Photoshop CS6 or some older version?
Is the procedure the same?

2015/01/02

Scott · Accepted Answer · 1/3/2015 7:10:00 AM

If your image is not square:

Choose View > New Guide then tick the Vertical option and enter 50% in the box and click OK.
Choose View > New Guide then tick the Horizontal option and enter 50% in the box and click OK.

This provides a guide intersection at the image center.

Grab the Marquee Selection Tool or the Crop Tool, hold down the Option/Alt and Shift key and click-drag starting at that center guide intersection.

This draws a square selection (crop area) at the center of the image.

Then simply choose Image > Crop, or hit the Enter to commit the crop (if using the crop tool)

If the image itself is square...

Choose Select > All from the menu.
Then choose Select > Modify > Contract
Tick the Apply effect from Canvas Bounds box and enter the amount of offset, from the canvas edge, you want and click OK.
Then simply choose Image > Crop

For versions of Photoshop where "contract" may not be available after selecting all, use the first method.