Print Utility · Imposition Tool · Operate Surface · 2026 · Solo — booklet imposition algorithm, folio naming, reading-direction support, print-room ticket generation, JSON export, Operate surface design, Vercel production deployment
Folio Fold
Browser-local booklet imposition engine: given a page list and reading direction, computes the duplex sheet layout for saddle-stitch folding — tracking front/back face assignments, sheet count, and print-room instructions for any 4–64 page extent (multiples of four).
The problem
Preparing a zine or short-run booklet for duplex printing requires knowing exactly which pages share each physical sheet face. Getting this order wrong wastes paper and requires reprinting. Print imposition software is either expensive or complex. Folio Fold solves this for the common saddle-stitch case: name your pages, pick a reading direction, and get the exact sheet order and print-room ticket in seconds — no document upload required.
Architecture
Key decisions
Browser-local only
No document upload or server-side parsing — the imposition algorithm operates purely on page count and reading direction, making the tool instant and private.
Saddle-stitch constraint
The tool targets the common saddle-stitch case (4–64 pages, multiples of four) rather than attempting perfect-bound or wire-bound layouts, keeping the algorithm bounded and the output trustworthy.
Source availability caveat
This case study was added via transparent Vercel-only recovery: the product is live and functional, but the source repository was not recoverable during reconciliation. Architecture is inferred from live behavior. Implementation notes available on request.