How two-up booklet imposition works
Each duplex sheet contributes four finished pages: two on the front and two on the back. A booklet or signature therefore needs a page count divisible by four. For an 8-page left-to-right booklet, the outer sheet is front 8 | 1 and back 2 | 7; the inner sheet is front 6 | 3 and back 4 | 5. After duplex printing, nesting, and folding, the pages read in normal order.
Adobe’s current InDesign booklet documentation distinguishes one nested 2-up saddle-stitch signature from 2-up perfect-bound work split into signatures. It also notes that incomplete pagination needs blank pages. This tool follows that page-pairing model, but outputs a planning table rather than modifying or printing your source file.
Single saddle stitch versus fixed signatures
Use one saddle-stitch signature for sheets nested together and stapled through the center fold. For a longer book assembled from several folded sections, choose fixed signatures and the section size your bindery or production method requires. The calculator pads the entire saddle booklet to the next multiple of four; fixed mode pads the last section all the way to the selected signature size.
Automatic blanks normally go after the final source page, matching common imposition software behavior. If your source’s last page is specifically the outside back cover, placing blanks before it keeps that page in the final logical position. Confirm blank handling in the program that will produce the actual print stream.
Frequently asked questions
Does this rearrange my PDF?
No. It generates a page-order plan, preview, copyable report, and CSV. Use appropriate layout or PDF software to impose the actual pages, and compare its preview with this plan.
Why were blank pages added?
A folded duplex sheet always supplies four page positions. Saddle mode rounds up to a multiple of four. Fixed-signature mode also completes the final signature to the chosen section size.
Which duplex flip setting should I use?
That depends on page orientation, printer driver, feed path, and how the paper is reloaded. The table describes both finished faces as viewed face-on; it cannot safely prescribe a universal “long edge” or “short edge” setting. Print and fold a labeled test sheet first.
Does this calculate creep, bleed, or trim marks?
No. Paper thickness, fold method, trimming, bleed, marks, and binding equipment require a production-specific imposition workflow. This calculator focuses on pagination and physical sheet counts.