Signature planner
A sewn book is not 200 pages; it is thirteen 16-page signatures — and the arithmetic (pad to a multiple of four-times-sheets, divide, hide the blanks) is exactly the kind you want shown, not trusted. Type your page count; the planner answers with the signature count, each one's page range, and where the padding went. Pure arithmetic, on this machine.
The book as it will read — the planner adds the blanks itself.
More sheets per fold = fewer sewings, but harder folding and more creep.
- Reading pages
- 200as the book runs front to back
- After padding
- 2088 blanks hide inside the last signature's fold
- Total sheets of paper
- 52every sheet becomes four pages once folded
- Each signature carries
- 1–16 · 17–32 · 33–48 · 49–64 · 65–80 · 81–96 · 97–112 · 113–128 · 129–144 · 145–160 · 161–176 · 177–192 · 193–208reading order, signature by signature
- Print each signature as a booklet of 4 sheets — the booklet pairing puts the outermost sheet's pages on the outside, which is where they must land when it folds.
- Fold each signature through the middle as one unit, nested sheets and all — not sheet by sheet, or the fold creeps.
- Stack in order, sew through the fold, then press before casing in. The planner's ranges are the sewing order.
Pure arithmetic, on this machine — nothing to upload because there is nothing to upload.
Why four times the sheets
A signature is sheets folded together as one unit, and every sheet carries four pages once folded — two a side. So a 4-sheet signature is 16 pages, an 8-sheet is 32, and a page count that doesn't divide evenly is padded with blanks that end up inside the last signature's fold, the one place in a book where blank pages are invisible by design. The planner never rounds a signature up silently; it tells you how many blanks it added and where they sit.
| Your book | 4-sheet signatures | 8-sheet signatures |
|---|---|---|
| 100 pages | 7 signatures (112 padded, 12 blanks) | 4 signatures (128 padded, 28 blanks) |
| 200 pages | 13 signatures (208 padded, 8 blanks) | 7 signatures (224 padded, 24 blanks) |
| 320 pages | 20 signatures — exact | 10 signatures — exact |
Fewer, fatter signatures mean fewer sewings — and more creep, the inner sheets poking past the outer ones. Hand folders settle on 4 sheets; machine binderies default to 8. Past 8, you are folding with a machine or fighting paper.
Questions people actually ask
Why not one giant signature?
A signature's fold shifts inner sheets outward — creep. A 16-sheet signature creeps visibly; a 32-sheet one won't close flat. Four sheets is the hand-fold sweet spot, eight the machine's.
Do the blanks weaken the last signature?
No — they fold inside it, take the sewing like any leaf, and end up hidden against the inside back cover. Books have been padded this way for as long as books have been sewn.
Does this plan the imposition too?
It plans the folding structure — counts, ranges, sheet counts. The page-ordering within each signature is the booklet pairing; print each signature's range through the booklet imposer.
What about endpapers?
Endpapers are separate leaves tipped on before casing, not part of the sewn block. Count them out of this arithmetic — the case-making calculator is where they surface.
The studio splits a WhatsApp chat into printable signatures automatically.
See it work — freeThis is one of the tools — or see everything we’ve written.