Cut every page down the middle
A PDF whose pages are two-up spreads — a scanned open book, an exported facing-pages layout — reads badly on screen and worse on a re-print. This cuts every page exactly in half, left half first, then right, in order. It knows nothing about imposition logic and says so: for booklets that need re-ordering as well as cutting, that's the de-imposer's job.
One clean cut per page — a guillotine, not a collator.
The scan workflow's first cut
Photograph or scan an open book and every image is a spread. Split them all at once, then if you scanned fronts and backs separately, rebuild the order next.
Designers' handoff fix
Exported spreads from layout tools are great for reviewing and useless for editing. Halve them, get single pages, hand them back.
Portrait or landscape, it cuts the width
The cut is always vertical — spreads are side-by-side by nature. Top-bottom splits are a different tool nobody has asked for yet.
Questions people actually ask
Does my PDF get uploaded anywhere?
No. Pages are copied and cropped in your browser's memory; the halves land as a download. Book scans are private by definition.
Left half then right — always?
Yes, page by page in reading order: page 1's left, page 1's right, page 2's left… That is the order an open-book scan reads in. For RTL books you'll want to swap pairs afterwards in an editor.
What about the gutter shadow in my scan?
It stays — this cuts, it doesn't clean. Descreen/deskew in your scanning software first if the scan is rough; the split preserves whatever it is given.
Can it split into quarters?
Not this tool. Run it twice — halves of halves — which is exactly what quarters are, or use it once and cut again in an editor for the rare four-up case.
Printing a chat book? The studio never makes spreads you'd need to undo.
Make the book — freeThis is one of the tools — or see everything we’ve written.