filmwrap

A small web app that prints wrap-around labels for 35mm film canisters.

I shoot a fair amount of expired film, and a 35mm cassette doesn't tell you when it was bought or when it expires. I'd been handwriting those dates on the canisters, so I made this to print tidy labels instead. Each label is a thin strip: it prints the stuff I already know (film name, ISO, format, process, purchase date, expiry) and leaves blank lines for the things I fill in later, the event and the date I shot it. You cut a strip out, wrap it around the roll, and tuck it into the canister tube.

It's a single filmwrap.html file. No install, no build, no server. Open it in a browser and go. Your film library is saved locally in the browser, and you can export/import it as JSON.

1. Open filmwrap.html in your browser (double-click it).
2. Add your films: name, ISO, format, frames, process, purchase date, expiry, how many rolls, and a color. ("Load sample films" drops in a few examples.)
3. Tweak the strip size if you want, check the preview, and click Print sheet.
4. Cut along the guide lines, wrap a strip around each roll, and put it in the tube. Write the event and date after you've shot it.

In the browser print dialog, set Margins: None and turn on Print backgrounds (otherwise the color accent bars don't print). Scale can be 100% or "Fit to page width"; both come out at the right physical size, since the sheet is laid out in real inches.

• Film library with add / duplicate / delete. Each film tracks brand, ISO, format, frame count, process (C-41 / E-6 / B&W), purchase date, expiry, roll count, and a color accent for sorting at a glance.
• Strips auto-stretch to the page width by default; turn that off for a fixed length, or use the wrap calculator (canister diameter x wraps).
• Cut-line grid so you can cut straight lines.
• Live preview with zoom, Letter or A4, adjustable margin / strip height / gap / font / text size, and toggles for which fields print.
• Saves to the browser automatically, with JSON export/import for backups or moving between machines.

It runs entirely offline and makes no network requests. The library lives in your browser's localStorage. Export gives you a JSON backup; import restores it or copies it to another browser.

It's plain HTML/CSS/JS in one file, so just edit filmwrap.html. There's a Playwright suite (test_filmwrap.py) that drives the page in headless Chromium and checks the behavior, including generating a print PDF and asserting it's 3 pages of 8.5x11in with no blank pages.

pip install playwright pypdf
playwright install chromium
python test_filmwrap.py

MIT, Copyright 2026 Kameron Markham.