Your Online PDF proof is set up to be "press-ready". This means it includes bleed and all print marks as required. The lines in all four corners are most likely crop marks. They help our production team align trimming blades to cut your order to size. These marks will not be visible on your final product.
See: Crop marks

If the marks do not appear to be crop marks or you have further questions, please contact our Customer Service team.

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