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12 pages → 3 sheets (duplex)
Sheet 1 — Front
Lay out a print-ready PDF
Imposer rearranges the pages of an input PDF onto larger sheets so they can be printed, folded, and bound. Pick a layout, choose a paper size, set margins and gutters, then export a new PDF that prints in the right order. The PDF is processed locally with pdf.js and pdf-lib; nothing is uploaded.
1. Source PDF
- Drop zone. Drag a PDF onto the dashed area, click to browse, or paste a copied PDF file. The page count appears once it is parsed.
- Blank mode. When no PDF is loaded, the tool generates blank pages so you can rehearse a layout. Switching back to a loaded PDF uses the real pages.
- Inferred paper size. The tool measures the first page and offers an "Infer from PDF" entry in the paper-size selector when you want the output sheet to match the source.
2. Layout configuration
- Layout. Saddle-stitch, perfect-bind, step-and-repeat, four-up booklet, gang-run, and custom n-up. The combobox shows a one-line use case for each.
- Paper size and orientation. Pick a standard size, infer from the PDF, or enter a custom width and height. Two-up booklet layouts auto-suggest landscape so two source pages fit side by side.
- Margins and gutter. Margin is the empty band around the sheet edge; gutter is the space between adjacent slots, used to keep ink off folds or trim lines.
- Creep. A small per-sheet inward offset for booklets that compensates for outer pages drifting away from the spine when sheets are folded together.
- Scaling. Fit shrinks pages to fit, Fill scales to cover (may crop), Actual size keeps source dimensions and centres them.
- Crop marks. Adds short trim lines at the outer page corners for cutting after print.
- Blank handling. Auto inserts blank slots where the page count does not divide evenly into a signature; Leave empty leaves the slot truly empty.
- Duplex flip. For booklet layouts, sets whether the printer expects long-edge or short-edge flipping during double-sided printing.
- n-up and custom grid. Gang-run takes a single N value (2/4/6/8/9). Custom n-up takes explicit rows and columns.
3. Preview, export, and print guide
- Sheet stack. Cycles through the imposed sheets with the previous and next buttons. The flip control toggles front and back of duplex layouts.
- Download Imposed PDF. Generates the new PDF in the configured paper size, with the chosen pages, gutters, scaling, and crop marks.
- Print Guide. Expands a step-by-step list for manual duplex printers, telling you which PDF pages to print first and which paper edge to flip on between passes.
What does each layout do?
Saddle-stitch and four-up booklet impose pages so they can be folded into a booklet and stapled along the spine. Perfect-bind orders pages for a glued spine. Step-and-repeat duplicates a single artwork across the sheet. Gang-run packs N copies of the same page on one sheet, and custom n-up uses a free row-by-column grid.
Why is creep only useful for booklets?
Creep compensates for the way folded sheets push outer pages further from the spine as the booklet thickens. It only matters when pages are nested and folded together, which is why it appears for saddle-stitch and four-up booklet layouts.
Does the imposer scale or crop my pages?
It depends on the Scaling option. Fit shrinks each source page to fit its slot without cropping, Fill scales to cover and may crop, and Actual size keeps the source dimensions and centres the page in its slot.
What are the crop marks for?
Crop marks show where each page should be trimmed after printing. They are essential for offset and copy-shop workflows; turn them off when printing on home equipment that cannot trim.
Is anything uploaded?
No. The PDF is read with pdf.js, imposed with pdf-lib, and the new file is generated entirely in your browser. The page thumbnails and the output never leave the tab.