Crop marks are the small line marks in the corners of press-ready files – they mark where the trimming knife will be aligned to trim down your order to remove the additional artwork along the edge (the bleed).
Crop marks are useful in your uploaded file, but not necessary – they will be added by our prepress team (as long as you have sufficient bleed and artwork setup correctly). If you are including crop marks – please ensure they are set away from your artwork at least 0.1 inch.
Below is an example of setting up crop marks.
Too close to artwork
Marks offset from artwork
Do not include any border (or die-line) on your artwork.
The following animation shows how crop marks are used