We recommend a 0.125" bleed area outside of the trim line and a 0.25" quiet area inside of the trim line. Some products have different bleed requirements, but we’ll cover those exceptions below.
While you don’t need to include visible bleed lines in the final design that you submit to be printed, they should be taken into consideration during your design process. Incorporating bleed helps to prevent unwanted white edges, keep important elements of your design from being chopped off or hidden in the folds of your books pages.
Incorporating a quiet area inside the trim line prevents important elements of your design from being placed too close to the edge of the paper