Bleeds

Q. Does my artwork have 3mm bleeds?
A. Printers require a 3mm bleed around the perimeter of your artwork to ensure accurate cutting (e.g., artwork for a 148mm x 105mm postcard should extend to 154mm x 111mm). If your image has a white border on all four sides, bleeds are recommended but not required. If your image is not white on all four sides, you must include bleeds in print-ready files. Before submitting your artwork files.
Need more information about bleeds? see what are bleeds on my blog.