The available tool options for Crop can be accessed by double clicking the Crop tool icon.

The Tool Toggle for the Crop Tool alternates between Crop mode and Resize mode.

Crop Mode is the standard mode of operation for the Crop Tool. Cropping an image or layer will change a layer by eliminating everything outside the cropping area. The cropping area can be set by either dragging the tool to form a rectangle area or manually setting the origin, width, and height. Cropping areas can also be set based on an existing selection or by using the Auto Shrink button. These options are available within the Crop And Resize Information dialog which is shown when the Crop Tool is clicked on an image or layer.

If you are cropping an image (not just a layer), then Resize Mode changes the shape of the image without altering the size or shape of the layers it contains. This may leave parts of some layers extending beyond the edges of the image, where you cannot see them, but if you move the layers, you will see that the contents still exist. If you are cropping a layer, Resize Mode does the same thing as crop mode.

You can also switch to Resize mode in two other ways: first, by using the Resize button on the dialog instead of the Crop button; second, by holding down the Ctrl key while you click inside the crop region to complete the operation.

This option will make the crop or resize affect only the active layer.

This option allows the crop or resize to take place outside the image or layer boundary.

With this option, cropping will respect a fixed ratio between Width and Height.