Saddle-Stitch Booklet Imposition - Free Online Browser Tool

Rearrange pages into 2-up spreads formatted for printing, folding, and stapling into a booklet.

Saddle-stitch imposition rearranges pages into the 2-up order a booklet is printed in: outermost sheet first, innermost last. This version produces that order with full printer marks, fold guides and bleed handling for a professional print shop rather than a desktop printer.

This saddle-stitch booklet imposition utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: Book Spine Width Calculator & Cover Generator, Mirror Pages.

How to Use the Saddle-Stitch Booklet Imposition Tool

Four steps, and the whole thing runs locally on your own device.

  1. Load the interior PDF

    Drop in the pages to be bound, in reading order.

  2. Check the sheet count

    The tool totals the pages, adds blank fillers to reach a multiple of four, and reports how many physical sheets that requires.

  3. Apply imposition with marks

    Pages are ordered into booklet sequence with crop marks and fold guides added outside the trim area.

  4. Download the press-ready file

    Save the imposed PDF and send it to the printer with your cover file and paper specification.

Frequently Asked Questions

What is 4-page imposition?

The standard saddle-stitch signature: sixteen pages on four sheets, eight on two, or four on one, folded and stapled. That grouping of four is what the fold requires.

Why does the page count need to be a multiple of four?

Each sheet carries four pages after folding, so a page count that is not a multiple of four would leave an incomplete final group. Blank fillers complete it.

What is the maximum practical page count?

Practical saddle-stitch limits sit around 64 pages — beyond that the folded spine cracks and wire binding is more appropriate.

How does this differ from the desktop Booklet Maker?

This produces press-ready output with crop marks, fold guides and bleed for a commercial print shop. The Booklet Maker is aimed at printing duplex on a desktop printer.

What does the printer need from me besides this file?

The cover artwork, the interior PDF, the final page count, the paper specification and the binding instruction. Supplying the total page count up front avoids binding to the wrong extent.