Lines printed at the corners of the page to mark the final size of the design. The page is cut along these marks.
Also referred to as: trim marks, cut marks, crop margins.
Bleed or the bleed allowance is used in printing and prepress to describe the area that is still being printed but which is outside the actual print and is cut off at the end.
Bleed is important because paper is a medium that is never exactly 100% identical in the printing press, and these fluctuations increase in every processing step such as folding and stitching. If the data were delivered in the “plain” final format alone, a white margin would often be visible at the edge – sometimes at the top, sometimes at the bottom, sometimes on the right and sometimes on the left – which is caused by the offset of the printed image during printing and further processing.
Most printing companies do well with 3mm bleed, Flyeralarm can also cope with a tolerable one millimetre, sometimes the bleed specifications are also in between or – as for large displays and mega posters – much higher, as fabric or tarpaulin warps even more easily.
If in InDesign or other layout software or in imposition software auxiliary marks are placed on the PDF or the print data, then there are also bleed marks that indicate the inner area to which the bleed is applied and the outer area to where the bleed reaches maximum.