Our album editor includes a very visible red line. The purpose of the red line is to assure that you understand the limit of the image area. Anything beyond the red line with not be printed in your album.
This is how the red line looks:
The part beyond the red line would appear grayed out to show you the part that is not going to be printed.
It appears as seen below:
So be sure not to go beyond the red line if you want to avoid your pictures being cropped.