Printing a hundred-page document uses a hundred sheets. Putting four pages on each one uses twenty-five. This builds that arrangement into the file itself, which matters because a print dialogue's own "pages per sheet" setting is unreliable — it varies by driver, gets lost when you send the file to someone else, and is often missing entirely from mobile and web print paths.
How the pages are arranged
Pages fill left to right, then top to bottom, in reading order. Two per sheet gives a landscape sheet with two portrait pages side by side. Four gives a two-by-two grid on a portrait sheet. Six and nine use two and three columns respectively, in the same reading order.
Each page is scaled to fit its cell and centred, keeping its proportions, with a small gap so adjacent pages do not run into each other. Nothing is cropped or stretched.
How small is too small
- 2-up is comfortable for almost anything. Body text stays easily readable.
- 4-up works well for slides, presentations and documents with generous type.
- 6-up is fine for reference material you will scan rather than read closely.
- 9-up produces a contact sheet. Treat it as an index, not something to read.
The arithmetic is unforgiving: 4-up halves the linear dimensions, so 11-point body text prints at about 5.5 point. That is legible for most people at close range and difficult for anyone who needs reading glasses. Trimming the margins first genuinely helps, because it lets each page occupy more of its cell.
It stays a real PDF
Pages are embedded rather than rasterised, so text remains text — selectable, searchable and printing at your printer's full resolution rather than at the resolution of an image. Vector diagrams stay sharp. That is the difference between this and screenshotting pages into a grid.
Links, annotations and form fields do not survive, since their coordinates referred to the original page positions. The file size stays close to the original, because the same content is being drawn in a different arrangement.
Order of operations
Do this last. Once pages are combined onto sheets, the page-level tools see each sheet as a single page, so deleting, reordering or numbering afterwards will not do what you expect. Merge, arrange, trim and number first, then condense. Everything runs in this tab, with nothing uploaded.
Landscape originals need thinking about
The arrangement assumes portrait pages, which is what most documents are. A landscape original — a spreadsheet, a wide diagram, a set of slides — will be scaled to fit its cell and end up with space above and below rather than filling it. For slide decks in particular, 2-up on a portrait sheet often wastes less paper than 4-up does.