Bindery is a privacy-focused PDF and booklet imposition toolkit for Android — every core tool runs entirely on your device. No cloud uploads, no account requirements, and no third-party trackers. Your documents never leave your phone.

Merging, scanning, converting, and booklet-making all run locally using your device hardware. The only feature that connects to the network is optional: importing a public PDF from a URL you explicitly provide. Everything else stays strictly on your device.

Bookbinding, Zines & Booklet Tools:

• PDF Booklet Maker & Imposition:
Turn standard PDFs into ready-to-print folded booklets, zines, and manuals. Features balanced signature distribution (including 4-page single-sheet signatures), sheet-order options for auto-folding duplex printers, configurable gutter margins, creep compensation for paper thickness, and right-to-left (RTL) binding support.

• Book Cover Studio:
Design custom book covers for paperback, flexible, or hardcover bindings (with selectable board thicknesses from 1.5 mm to 3.0 mm). Calculate spine width automatically based on page count and paper weight, choose between 2×A4 split covers or single A3 wrap jackets, apply curated craft palettes, and include precision crop marks for trimming.

• Markdown to Booklet:
Convert plain Markdown files (.md) directly into beautifully formatted, printable A5 booklet layouts with calibrated typography presets — no desktop formatting software needed.

• Assembly Guides & Collation Marks:
Print with stepped spine collation marks and center-fold guides to make multi-signature sorting, folding, and sewing effortless and precise.

PDF Editing & Utilities:

• Merge, Reorder & Organize:
Combine multiple PDF documents into a single file, rearrange page order, and remove unwanted pages with a visual organizer and memory safety guards.

• Add Page Numbers:
Insert customizable page numbers across your documents with flexible positioning, margins, and starting numbers.

• Watermark PDF:
Protect or label your documents by applying custom text or image watermarks with adjustable opacity and rotation.

• Rotate PDF Pages:
Rotate individual pages or entire documents to correct orientation before printing or sharing.

Scanning & Reading:

• Document Scanner (Image to PDF):
Capture or import images, correct perspective with edge warping, and convert photos directly into clean PDF documents without cloud processing.

• PDF Reader & Viewer:
Fast, lightweight, and smooth document viewing with landscape support and recent file history.

• System Share Target:
Open and process PDFs directly from other apps via the Android system share sheet.

Ideal For:
• Independent zine makers and self-publishers
• Traditional bookbinders and craft hobbyists
• Students, researchers, and educators printing study booklets
• Tabletop RPG rulebooks, pocket manuals, and scripts

Privacy & Open Source:
• Local On-Device Processing: Your sensitive documents, contracts, and scans are processed locally on your device.
• Zero Telemetry: No third-party tracking libraries, analytics SDKs, or data harvesting.
• Open Source: Licensed under GPL-3.0. The full source code is publicly available on GitHub for independent verification.