If you’re printing Saddle stitched brochures and are using a paper weight over 120gsm or have anything over 12 pages, you’ll need to allow for creep in your document.
Creep is the technical name for what happens when you fold a stack of pages together; the outer pages appear shorter as they wrap around the large inner bulk. Because of this, the inner pages stick out slightly and so are trimmed by us to give a nice, straight document edge. Anything that is printed over this trim line, like text or page numbers, will be cut away.
To combat creep, we always recommend that you avoid using images or text which go over a two page spread. The best way to avoid wonky page numbers, images or text is to make sure that everything is 5 - 6mm away from the edges of your page.