Booklet Imposition Planner – Saddle-Stitch Page Order for Every Sheet

Use the free Booklet Imposition Planner below. It runs entirely in your browser, with no sign-up and no download.

The puzzle of the folded booklet

A saddle-stitch booklet looks simple until you try to print one. You print sheets double-sided, fold them together, and staple the fold. But the pages do not land in reading order on the sheets. The first sheet carries the first page and the last page, the second sheet carries the second page and the second-to-last, and so on. Print the pages in reading order and the booklet comes out as a shuffled mess. Print them in imposition order and it falls open correctly.

This planner works out that order for you. Enter the number of pages, and it lists every sheet with the pages that go on its front and back, left and right. It also handles the awkward case where your page count is not divisible by four, by adding blank pages at the end, exactly where a printer would put them.

How imposition works

Saddle-stitch booklets are built from sheets folded in half, each sheet contributing four pages: two on the front, two on the back. With a total page count N, sheet one has N on the front left and 1 on the front right, and 2 on the back left with N minus 1 on the back right. Sheet two has N minus 2 and 3 on the front, and 4 and N minus 3 on the back. The pattern walks inward from both ends toward the middle, which is why the centre spread of the booklet is the last sheet printed.

The rule only works when N is divisible by four, because each sheet holds exactly four pages. A 10 page booklet therefore becomes a 12 page booklet with two blanks at the end. Those blanks are not wasted pages. They are the back of the last sheet, and they are where a contents page, a notes page or a deliberate blank belongs. Plan for them in your design instead of discovering them at the printer.

A worked example

Take an 8 page booklet. Sheet one front is pages 8 and 1, and its back is pages 2 and 7. Sheet two front is pages 6 and 3, and its back is pages 4 and 5. Print sheet one double-sided flipping on the long edge, print sheet two the same way, stack sheet two inside sheet one, fold once, and staple. Open the booklet and the pages read 1 through 8, with pages 4 and 5 facing each other at the centre spread.

Scale that to a 16 page booklet and you get four sheets: 16 and 1 with 2 and 15, then 14 and 3 with 4 and 13, then 12 and 5 with 6 and 11, then 10 and 7 with 8 and 9. The pattern is mechanical, which is why a planner beats working it out by hand, especially past 20 pages, where a single swapped pair ruins the whole run.

Printing and folding without tears

Print double-sided flipping on the long edge, and test with one full copy before printing the run. Check that the centre spread is the middle pages, that no page is upside down, and that the fold falls exactly between the two middle pages of each sheet. If a page is upside down, you have flipped on the wrong edge. If the order is wrong, you have stacked the sheets in the wrong sequence, not printed them wrong.

For thicker booklets, remember creep: the inner sheets are pushed outward by the fold, so their outer edges stick out further and their margins look tighter after trimming. Professional printers compensate by shifting inner pages slightly inward. For home booklets under about 40 pages, creep is small enough to ignore, but for thicker ones, trim after folding and expect the centre pages to lose a millimetre or two at the edge.

Frequently asked questions

Can I make a booklet with 6 pages? Not as a saddle-stitch booklet without blanks. Six pages becomes eight with two blanks, and you should design knowing where those blanks fall.

Does paper size matter for imposition? No. The page order is the same for any size. What changes is the sheet size, which is twice the page width, and the fold, which is always down the middle of the sheet.

What about perfect binding? Perfect bound books are not folded sheets but single pages glued at the spine, so they need no imposition. This planner is for saddle-stitch booklets only.

Spanish version

Planificador de Imposición de Folletos – Orden de Páginas Cosidas para Cada Pliego