When printing from home, or using a copy center, you’ll want to download as a PDF and select bleed, trim marks and the save paper options. The bleed is an extra 1/8” of the image or background color, that extends beyond the trim area of your template.
Your template will be printed on an oversized sheet, that will then be cut down to size, with the appearance that the image is “bleeding” off the edge of the paper. We use the bleed feature to avoid strips of white paper showing on the edges of your print, when it’s cut to size using trim marks. If a document has no bleed, and the trimming is off by even 0.5mm, then you will end up with a white strip showing, which gives it an unprofessional appearance.
If you use a professional print shop, they typically request you download the JPEG and add a bleed. Most print shops do not want you to add the trim marks, as their machines calculate the sizing. You can always call or email the print company to see what their preferences are before hand.