A 40-slide deck printed one slide per sheet uses 40 sheets of paper and is awkward to flip through in a meeting. The same deck at four slides per sheet uses ten, fits in a folder, and still lets you read every slide. That layout has a name in printing: n-up, where n is the number of pages placed on each physical sheet.
Most print dialogs offer a "pages per sheet" setting, but it only affects that one print job, behaves differently from printer to printer, and cannot be emailed to someone else. Building the layout into the PDF itself fixes all three problems. This guide explains what n-up means, how each layout scales your pages, how page order works, what survives the conversion, and how to make an n-up file with the N-Up PDF tool without uploading the document anywhere.
TL;DR: N-up printing places several PDF pages on one sheet: 2-up puts two side by side, 4-up makes a 2 x 2 grid, 6-up a 3 x 2 grid, and 9-up a 3 x 3 grid. The N-Up PDF tool builds a new PDF on US Letter sheets (landscape for 2-up, portrait for the rest), scales every page to fit its cell with a 10-point margin, keeps text as selectable vector content, and fills cells left to right or top to bottom. A 10-page Letter document at 4-up becomes 3 sheets with each page drawn at about 47% size. It runs client-side, free, no signup, and nothing is uploaded.
What does n-up mean for a PDF?
N-up is a page layout in which n logical pages are arranged on a single physical sheet. The term comes from commercial printing, where "2-up" or "4-up" describes how many copies or pages are imposed on one press sheet. In a PDF context it means taking an existing document and producing a new one whose pages are grids of the original pages, each scaled down to fit.
The result is a real PDF file, not a print setting. You can send it to a copy shop, attach it to an email, or print it from any device, and it will come out the same way every time.
Which n-up layouts are available?
The tool offers four grids. There is no custom grid such as 8-up or 16-up, and no booklet imposition.
| Layout | Grid (columns x rows) | Sheet orientation | Pages per sheet | Paper saved vs 1-up |
|---|---|---|---|---|
| 2-up | 2 x 1 | Landscape, 792 x 612 pt | 2 | 50% |
| 4-up | 2 x 2 | Portrait, 612 x 792 pt | 4 | 75% |
| 6-up | 3 x 2 | Portrait, 612 x 792 pt | 6 | About 83% |
| 9-up | 3 x 3 | Portrait, 612 x 792 pt | 9 | About 89% |
Every output sheet is US Letter, 8.5 x 11 inches. PDF measures page size in points, where one point is 1/72 of an inch, as defined for default user space in the PDF standard, ISO 32000-2. So 8.5 inches is 612 points and 11 inches is 792. An A4 original still produces Letter sheets; the source page size is not carried over.
The number of sheets is the page count divided by pages per sheet, rounded up. A 10-page document gives 5 sheets at 2-up, 3 at 4-up, 2 at 6-up and 2 at 9-up.
How are pages scaled to fit each cell?
Each page is scaled uniformly, keeping its proportions, by the largest factor that fits inside its cell after a 10-point margin is taken off every side. Nothing is cropped and nothing is stretched. Here is the calculation from the tool's layout code, simplified:
const cellWidth = sheetWidth / cols
const cellHeight = sheetHeight / rows
const availableWidth = cellWidth - 2 * 10
const availableHeight = cellHeight - 2 * 10
const scale = Math.min(availableWidth / pageWidth, availableHeight / pageHeight)
Worked example: a Letter page at 4-up
A 4-up sheet is portrait Letter, 612 x 792 points, split into 2 columns and 2 rows.
- Each cell is 612 / 2 = 306 points wide and 792 / 2 = 396 points tall.
- Removing a 10-point margin on each side leaves 286 x 376 points.
- The source page is 612 x 792. Width ratio: 286 / 612 = 0.467. Height ratio: 376 / 792 = 0.475.
- The smaller ratio wins, so the page is drawn at 46.7% of its size: 286 x 370 points, centered in its cell.
That is why the tool describes 4-up as "about 47%". The same arithmetic gives these figures for common source sizes:
| Source page | 2-up | 4-up | 6-up | 9-up |
|---|---|---|---|---|
| US Letter portrait (612 x 792 pt) | 61% | 47% | 30% | 30% |
| A4 portrait (595 x 842 pt) | 63% | 45% | 31% | 29% |
| 16:9 slide (960 x 540 pt) | 39% | 30% | 19% | 19% |
Two results surprise people. First, 6-up and 9-up give nearly the same scale for a portrait page, because a 6-up cell is as narrow as a 9-up cell (both are a third of the sheet width) and width is the limiting side. If you are choosing between them for readability, 9-up costs you almost nothing extra and saves more paper. Second, widescreen slides come out small on every layout, because the sheet orientation is fixed by the layout and a wide slide in a portrait-shaped cell is limited by width.
How small will the text be?
Multiply the original font size by the scale. Body text set at 11 points on a Letter page prints at about 11 x 0.61 = 6.7 points at 2-up, 11 x 0.47 = 5.1 points at 4-up, and 11 x 0.30 = 3.3 points at 6-up or 9-up. As a rough guide, 6 to 7 points is readable for most people, 5 points takes effort, and 3 points is too small to read as running text. So 2-up suits documents you need to read, 4-up suits slides and drafts, and 6-up or 9-up are for reviewing the shape of a document, like a contact sheet.
How does page order work?
Page order decides the path pages take through each sheet's grid. The tool has two options, and it helps to see them laid out. Numbers below are original page numbers; a dash is an empty cell.
Left to Right, Top to Bottom (the default) fills each row before starting the next, the way you read English text.
4-up, 10 pages Sheet 1 Sheet 2 Sheet 3
1 2 5 6 9 10
3 4 7 8 - -
6-up, 6 pages Sheet 1
1 2 3
4 5 6
Top to Bottom, Left to Right fills each column before moving right, the way newspaper columns read.
4-up, 10 pages Sheet 1 Sheet 2 Sheet 3
1 3 5 7 9 -
2 4 6 8 10 -
6-up, 6 pages Sheet 1
1 3 5
2 4 6
9-up, 9 pages Sheet 1
1 4 7
2 5 8
3 6 9
For 2-up there is only one row, so both options give the same result: page 1 on the left, page 2 on the right. There is no right-to-left order and no booklet order. If you need pages in a different sequence, rearrange them first with the Organize PDF tool, then run n-up on the result.
What happens on the last sheet?
The remaining cells are left empty. If a document has 10 pages and you choose 4-up, the third sheet holds pages 9 and 10 in its top row (or left column, with column order) and nothing else. No blank padding pages are inserted and the last pages are not enlarged to fill the space. If you want the last sheet balanced, add blank pages to the original first with the add blank page tool so the page count is a multiple of the grid size.
How to make an n-up PDF, step by step
- Open the N-Up PDF tool and drop a PDF onto the upload area, or click to choose one. The file name, size and page count appear once it loads.
- Choose a layout: 2-up, 4-up, 6-up or 9-up. Each button shows a small grid preview.
- Choose the page order: Left to Right, Top to Bottom, or Top to Bottom, Left to Right.
- Check the Output Preview line, which reads, for example, "10 pages will be arranged into 3 sheet(s)".
- Click the download button. The file is saved with the layout as a prefix, so
report.pdfat 4-up downloads as4-up-report.pdf. - Print the new file at 100% or "actual size". Letting the printer "fit to page" again shrinks the sheet a second time.
What survives an n-up layout, and what does not?
Page content survives as vector graphics. Interactive parts of the PDF do not. This follows from how the layout is built: each source page is embedded as a reusable graphic object (a form XObject in PDF terms) using the pdf-lib library, then drawn at its position on the new sheet. The page's visual content comes along; the document structure around it does not.
| Element | After n-up | Why |
|---|---|---|
| Text | Kept, still selectable and searchable | Embedded as vector content, not rasterized |
| Images and vector drawings | Kept at original resolution | Drawn from the same content stream |
| Hyperlinks | Lost | Link annotations belong to the page, not its content |
| Bookmarks and outline | Lost | The new document has a different page structure |
| Form fields | Lost as fields; some may disappear visually | Widget annotations are not copied |
| Comments and highlights added as annotations | Usually lost | Same reason as links |
| Title, author, keywords | Empty | The output is a newly created document |
| File size | Not reliably smaller | Fonts and images are still included |
If a form's filled values matter, flatten the form before running n-up so the values become part of the page content. The original file is never changed; the tool always writes a new PDF as a download.
Common problems and how to fix them
Nothing happens after choosing a file. An encrypted or password-protected PDF fails to load and the upload box stays empty without an error. Remove the protection in software you trust, then load the unlocked copy. The same silence can mean the file is damaged.
One page is much smaller than the others. A landscape page in a portrait document is scaled from its own size to fit a portrait-shaped cell, so its width limits it and it comes out smaller. It is not stretched. If that makes it unreadable, split the PDF so the landscape pages are in their own file and run n-up on each part.
Content near the page edge looks crowded. Only a 10-point gap separates cells, 20 points between neighbors. A document with very small original margins will have its content close to the next page's content.
The printout is smaller than expected. The print dialog's scaling was set to fit, or the printer added its own n-up on top. Print at actual size, one page per sheet.
The A4 printer complains about paper size. The output is Letter, which is slightly wider and shorter than A4. Many print dialogs can scale it onto A4 with a small reduction; if yours stops with a paper-size error, choose the fit or shrink-to-printable-area option for this job only.
When should you use n-up, and when something else?
N-up is one of several page-arrangement tools, and the right one depends on the goal.
| Goal | Tool | What it does |
|---|---|---|
| Save paper, make handouts, review a whole deck | N-Up PDF | Many pages on each sheet |
| Put an entire document on one tall page | Combine to single page | Stacks all pages into one long page |
| Print one large page across several sheets | Posterize PDF | The opposite of n-up: one page split over many sheets |
| Interleave two scans of front and back pages | Alternate and mix pages | Merges pages from two files alternately |
| Fix a document scanned last page first | Reverse PDF pages | Flips the page order |
Order matters when you combine steps. Merge and reorder first, then n-up last, because n-up produces fixed sheets whose pages cannot be separated again. The merge PDF guide and the organize PDF guide cover those earlier steps, and the PDF tools hub lists the full set.
Is it private, and does it work offline?
Yes to both. The PDF is read, laid out and written inside your browser tab using JavaScript. The file never leaves your device and is not stored anywhere. Once the page has loaded, the tool works with no network connection, which also makes it usable for documents you are not allowed to upload to a third-party service.
Alternatives to a browser n-up tool
- Print dialog "pages per sheet". Built into most operating systems and printer drivers. Fine for a one-off printout, but the layout is not saved as a file and results vary by driver.
- Adobe Acrobat. The print dialog's "Multiple" page sizing option arranges pages per sheet with custom grids and can print to a PDF. It needs the software.
- macOS Preview. Printing with the Layout panel set to 2, 4, 6, 9 or 16 pages per sheet and saving as PDF produces an n-up file.
- Command line. Tools such as
pdfjamon Linux (for examplepdfjam --nup 2x2 input.pdf) handle batch jobs and custom grids.
The client-side tool trades custom grids and booklet modes for zero installation, identical results on every operating system, and a document that stays on your machine.
