Why Saddle-Stitch Booklets Always Require Page Counts in Multiples of 4

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Saddle-stitch binding works by mapping reader pages onto physical sheets, with each sheet holding exactly four page slots — two on the front and two on the back. Because every sheet must be fully filled before sheets can nest into a single folded signature, a booklet's total page count must always be a multiple of four. When a PDF falls short — say, five pages — a properly designed imposition tool pads the document with blank pages until the count reaches the next multiple of four, rather than dropping any authored content. The page order in the final imposed file is non-sequential by design: for an 8-page booklet, the outer sheet pairs pages 8 and 1 on the front, with pages 2 and 7 on the back. Developers building imposition tools are advised to validate their logic against known 8- and 16-page reference tables before relying on automated padding or creep adjustments.

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