Where N-up saves the most paper
N-up shines when the goal is fewer physical sheets rather than perfect legibility. Print lecture slides four to a page so students can annotate beside each one, run drafts 4-up to review a long document without a thick stack, or lay out a 9-up contact sheet to eyeball every page of a report at once. It is also useful for proofing a booklet's flow before committing to a full print run. If a reader truly needs to read every word comfortably, keep the original one-page-per-sheet layout; choose N-up when the value is compactness, overview or saving toner and paper.