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12 pages → 3 sheets (duplex)
Sheet 1 — Front
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.
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.
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.
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.
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.
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.