Format PDFs Into Imposed, Print-Ready Sheets for Bookbinding
Folio arranges your pages into printer-ready signatures — right in your browser. Your PDF never leaves your device.
Imposition, Calibration & Assembly Tools
Precision imposition
Pages are reordered and positioned with sub-millimeter accuracy for folio and multi-section layouts, so your signatures fold perfectly.
Calibrated to your printer
Every printer clips margins differently, and duplex rarely lines up on the first try. Folio's setup wizard prints a test sheet with built-in rulers, walks you through what you measure, and compensates for your specific printer — so the imposition you see is the imposition that prints.
Sewing templates & assembly marks
Generate sewing station templates, fold marks, and collation marks. Everything you need to go from printed sheets to a bound book.
Page prep tools
Add or remove pages, detect and strip existing page numbers, or add new ones in your preferred style. Get your PDF ready for binding before imposition even starts.
How It Works
Upload your PDF
Drop any PDF into Folio. Everything stays in your browser — nothing is uploaded to a server.
Choose your binding
Pick a binding style and paper size. Folio arranges pages into signatures automatically.
Export your print-ready PDF
Download imposed sheets ready for your printer, complete with fold marks and sewing guides.
Three Ways to Work
Three modes for every skill level — from first-timers to experienced binders.
Print & Fold is always free. Guided Binder includes 5 free exports with a free account.
Pricing
Start free. Pro from $4/month, billed annually.
Frequently Asked Questions
Is my PDF uploaded to a server?
No. Folio runs entirely in your browser. Your files never leave your computer — there is no server upload, no cloud processing, and no account required to get started.
What binding styles does Folio support?
Folio supports saddle-stitch booklets (single-section), multi-section sewn bindings, and perfect binding. The Print & Fold mode handles simple booklets; Guided Binder walks you through multi-section books; Expert Layout gives full control over any imposition.
Do I need a special printer?
Any home or office printer that handles your chosen paper size will work. Folio includes a built-in calibration tool to compensate for your printer's margin and duplex quirks.
Does Folio need an internet connection?
You need a connection to load the app, but all PDF processing happens in your browser — nothing is sent to a server. Once loaded, imposition and preview work without further network requests.
What does "5 free exports" mean for Guided Binder?
You can use Guided Binder to configure and preview your book as many times as you want. Your first 5 Guided Binder exports are free after creating an account, counted by unique source file. After that, exporting new Guided Binder books requires a Pro subscription.
Can I print on both sides of the paper?
Absolutely. Folio supports automatic duplex (if your printer has it) and manual duplex with step-by-step instructions. The calibration tool ensures front and back align correctly.
Upload a PDF and start imposing
Upload a PDF and start binding — no account required.
Try It FreeFrom the Blog
Calibration & Printing: Why Your PDF Looks Wrong
Why an imposed PDF prints shrunk, shifted, or upside-down on the back — and the exact driver settings that fix each one, including actual-size scaling, borderless printing, and the Linux, macOS, and Windows equivalents.
Page Numbering in Bookbinding
Why imposition lands page numbers on the wrong edge or upside-down, and how Folio detects pagination by sequence, crops or white-fills the old numbers, and re-stamps from the original index.
How to print a PDF as a book
The whole path from a flat PDF to a bound book: why pages print out of order, what imposition and signatures are, and how to choose a binding style and print it at home.
How to bind your creation
Turn a novel, comic, poetry collection, RPG rulebook, or any creative work into a real book: how to choose between a single booklet and sewn signatures, and keep page numbers and creep under control in a long book.
How to print a zine at home
Print a saddle-stitch zine on a home printer: why a zine never prints in plain 1, 2, 3 order, how many pages it needs, what paper to use, and how to fold and staple it.
How to turn fanfiction into a bound book
The full path from an AO3 download to a book on your shelf: getting the fic as a clean PDF, why the raw export won't print as a book, choosing between a stapled booklet for a oneshot and sewn signatures for a longfic, and the print settings that keep it all true to size.
What Is PDF Imposition? A Beginner's Guide for Bookbinders and Zine Makers
Imposition is the step between a finished PDF and a printable book: rearranging pages onto sheets so folding puts them back in reading order. Where the word came from, why the shuffle changes with the binding, and how much of it you still do by hand.
Free PDF Imposition Tools Compared: Which One Should You Use for Bookbinding?
A feature-by-feature look at pdfimpose.it, PDF Snake, Acrobat’s Booklet option, InDesign, Montax, pdfjam, and pdfpress.app — measured against a real prepress handbook’s own criteria for imposition software, creep handling included.
Signature Size Guide: How to Choose 4, 8, 16, or 32-Page Signatures for Your Book
Concrete, sourced guidance on choosing how many sheets go in each signature — why 3–5 sheets is the normal range, how paper thickness changes that answer, and how to set signature length and creep compensation in Folio.