MelonWallet

MelonWallet is a privacy-focused PDF book imposition and binding assistant for bookbinders, independent publishers, zine creators, educators, and print enthusiasts. Turn a PDF in normal reading order into duplex-ready booklet sheets or balanced folded signatures. Your PDFs are processed on your device and are never uploaded. KEY CAPABILITIES: 1. BOOK IMPOSITION • Saddle-Stitch Booklets: Arrange sequential pages into two-page sheet sides ready for folding and stapling. • Folded Signatures: Divide longer documents into balanced signatures with a configurable sheet limit. • Reading Direction: Prepare both left-to-right and right-to-left documents. 2. PAGE PREPARATION • Automatic Blank Padding: Add the blank pages required to complete each four-page fold pattern. • Manual Blank Pages: Insert labeled blanks before or after a page, then edit or remove them at any time. • Source Inspection: Read the PDF page count and summarize consistent or mixed page dimensions. 3. PAPER & DUPLEX SETUP • Paper Controls: Choose A3, A4, A5, Letter, Legal, Tabloid, or a custom sheet size. • Layout Controls: Set margins, gutter, fit or custom scaling, auto-rotation, upscaling, trim marks, and page labels. • Creep Compensation: Apply a controlled offset for thicker folded booklets. • Duplex Calibration: Configure automatic or manual duplex output and save printer orientation settings. 4. PREVIEW & PREFLIGHT • Three Preview Modes: Review physical sheet placement, reading order, or an accessible page list. • Preflight Checks: Verify file readability, page count, sequence, dimensions, sheet geometry, trim-mark clearance, signature thickness, duplex settings, and cover status. • Binding Overview: Inspect signatures, sheet sides, automatic blanks, and source-page placement before export. 5. PRODUCTION TOOLS • Vector PDF Export: Create a complete imposed PDF or separate signature files with an optional binding checklist. • Cover & Spine Template: Calculate spine width from page count and paper thickness, then generate a printable flat-cover template. • Offline Toolkit: Create production guides, notebook pages, printer calibration sheets, reusable presets, batch projects, and portable project packages. PRIVACY & DESIGN PRINCIPLES: • 100% Offline & Private: Your PDFs, custom settings, and exported documents remain strictly within your device sandbox. • No Account Required: Instant access on launch with zero mandatory sign-in or registration barriers. • Pure Utility Focus: No advertising banners, commercial trackers, subscriptions, or locked feature gates. • Interactive Learning: Includes an instructional starter sample and step-by-step preflight checklist for instant practice.