Compensate for paper thickness push-out ("creep") in folded saddle-stitched booklets directly in your browser. When multiple sheets of paper are folded in half and stapled along the spine, physical sheet thickness causes inner pages to protrude outward beyond outer cover sheets. During final three-knife face trimming, outer page borders are sheared off, potentially cutting through page numbers, captions, and text margins.

This prepress tool calculates total binding creep based on your booklet page count and paper thickness (such as 0.0045 inches per sheet for standard 24lb bond paper). The formula evaluates folded sheet count via ceil(totalPages / 4) and total creep via sheets × paper thickness. The tool progressively shifts inner page content inward toward the spine fold so trimmed margins remain visually uniform across all pages from cover to center spread.

For example, a 32-page booklet folded from 8 nested sheets of 0.0045-inch paper experiences 0.036 inches (approx 0.91 mm) of creep displacement, which this tool offsets by shingling inner page content proportionally.

All page analysis and coordinate repositioning execute locally in client-side JavaScript using pdf-lib. No booklets, personal manuscripts, or printing proofs leave your computer.