Laydown — Print Layouts

Laydown lays PDF pages out on printing sheets. Give it a document, tell it what you're printing on, and it arranges the pages so they come out right after they're printed, folded and cut. Two-up on A3, a saddle-stitched booklet, a sheet of labels — that job.

It runs on your own machine — nothing is uploaded anywhere. Get it on the Microsoft Store for a signed, auto-updating install that supports development, or build the same open-source app yourself from the source below.

• Your pages stay sharp. Pages are embedded as vectors, never turned into pictures. What comes out is exactly as crisp as what went in.
• It reads print files properly. If your PDF has a trim box and bleed — the way a print-ready export does — Laydown uses them. Ordinary PDFs work fine too.
• The preview is the real thing. The sheets on screen are rendered from an actual imposition, and the pink outlines are the cut lines that run used. It can't show you one thing and print another.
• It tells you before the press does. Margins that don't fit, a missing trim box, pages getting shrunk — you hear about it while you can still fix it.

Install

Windows — Microsoft Store — Laydown - Print Layouts: one click, signed, and it updates itself.

Windows — download — the portable .zip from Releases: unzip, run Laydown.exe (SmartScreen warns once — More info → Run anyway). Prefer a proper install? The .msix is signed with the project's own certificate, so Windows asks you to trust it once first — grab Laydown-msix-signing.cer from the same release and, in an elevated PowerShell:

Import-Certificate -FilePath .\Laydown-msix-signing.cer -CertStoreLocation Cert:\LocalMachine\TrustedPeople
Add-AppxPackage .\Laydown-<version>-windows-x64.msix

Skipping the trust step gets you error 0x800B010A. It's one-time — releases share the same certificate. 64-bit only — see the FAQ.

macOS — download the .dmg, drag it to Applications. First launch is right-click → Open (the app isn't code-signed yet).

Linux — download the .tar.gz, extract, run ./laydown. No Python or Qt needed.

From source — any platform:

git clone https://github.com/danielmevit/laydown.git
cd laydown
pip install -e .
python -m laydown

The Windows and macOS builds aren't signed, so you'll get a "publisher unknown" warning the first time. On Windows that's More info → Run anyway. Signing costs money and isn't there yet.

How it works

1. Open a PDF — button, Ctrl+O, or drag it onto the window.
2. Pick your sheet size and how many pages go on it.
3. Look at the preview. That's your printed sheet.
4. Generate PDF — send that to the printer.

What it does

Layouts

• N-up — 1, 2, 4, 6, 8, 9 or 16 pages per sheet, or set rows × columns yourself.
• Booklets — saddle stitch (nested and stapled through the fold) or perfect binding (signatures folded separately and glued). The page order is worked out for you.
• Creep — folded booklets push out at the open edge and lose margin on the inner pages; Laydown can shift the pages to compensate.
• Right-to-left binding, blank-page placement, gutters, page ranges.
• Turn pages to fit — landscape artwork on a portrait sheet, without editing the file.

Source pages

• Choose which box gets imposed — trim, bleed, crop or media.
• Pull bleed past the cut line so a slightly-off cut still lands on ink.
• Rotate, scale or reorder pages before they're laid out.

Marks

• Crop marks, gap crop marks (cuts that run right across the sheet), trim lines, registration marks, fold marks, perforation marks, collating marks, a colour bar, and text labels.
• Custom marks — point it at any PDF and it gets stamped on the sheet. Your own bull's-eye, star target, or house colour bar.

Working with it

• Undo/redo, per-section reset, and presets you can save and reload for a repeat job.
• Millimetres, centimetres, inches or points — your choice.
• Preflight warnings before you export.

Requirements

• 64-bit Windows 10/11, macOS 11+, or a Linux desktop (X11 or Wayland)
• Nothing else — the downloads include everything
• Python 3.10+ only if you're running from source

FAQ

Does it upload my documents? No. There's no network code in it at all. It opens your file, writes a new one, and that's the whole story.

Does it cost anything? On the Microsoft Store it's a one-time purchase, with no subscription, and buying it supports development. The source code is AGPL, so you can also build it yourself for free.

Will my pages lose quality? No. They're embedded as vectors, not re-rendered. Text stays text.

My PDF has bleed. Does that work? Yes — that's rather the point. Laydown imposes the trim box by default and can carry your bleed past the cut line. If your PDF has no boxes, it uses the whole page.

What's "creep"? When you nest folded sheets inside each other, the inner pages stick out further at the open edge. Trimming the stack flush takes more off them, so their margins end up narrower. Creep compensation nudges the pages to even that out. On a thin booklet you can ignore it.

Can it do work-and-turn? Not yet. That's a press technique where both forms go on one plate, and getting it subtly wrong wastes plates and paper — so it stays out until someone who runs a press has checked it. See ROADMAP.md.

Is there a 32-bit Windows build? No, and there can't be a sensible one: PyQt6 — the toolkit the interface is built on — only publishes 64-bit Windows packages. Building it for 32-bit would mean compiling Qt itself from source, which isn't something this project can support. If you're on a 32-bit machine, sorry — that one's not on us to fix.

Contributing

Issues and pull requests are welcome. The repo has notes for anyone (or anything) working on it: start at AGENTS.md, then docs/ai/START_HERE.md. ROADMAP.md is what's next; CHANGELOG.md is what happened.

pip install -e ".[dev]"
pytest                          # the full suite, no display needed
python -m laydown --smoke    # end-to-end check, exits 0 or 1
python -m laydown impose SRC.pdf -o OUT.pdf [--preset P.json] [--set TARGET=VALUE ...] [--force]
python -m laydown preflight SRC.pdf [--preset ...] [--set ...] [--json]

The engine (laydown/engine/) doesn't import Qt, so it's testable on its own — and every setting the UI offers has to be one the engine actually honours, or the test suite fails. That's deliberate; there's a story behind it in docs/ai/DECISIONS.md.

The headless CLI never loads Qt: exit 0 ok / 1 error / 2 blocked by a preflight error.

License

GNU AGPL-3.0 — free to use, study and modify. If you pass it on, or run a modified version as a network service, your version has to stay open under the same license and keep the attribution. © Daniel Mevit.

Made by damt.xyz — freelance design & development.

Provided "as is", without warranty. Check your output before you commit a job to press.

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