Network-accessible printing for USB TSPL thermal label printers (library + REST API + web UI).
Project description
🏷️ LabelJetty
Turn a cheap, USB-only TSPL thermal label printer into a smart, network-accessible label printer - drive it from your phone, desktop, or another machine over your LAN. It talks to the printer directly over USB (no CUPS, no vendor driver) and gives you a mobile-first web UI, a REST API, and a Python library for printing PNGs, PDFs, text, markdown, barcodes and QR codes. Optional, self-contained Homebox integration is built in.
Install
pip install labeljetty
# or, with uv:
uv tool install labeljetty
This gives you three commands:
labeljetty- runs the service (REST API + web UI + background print worker)labeljetty-testbench- drives the printer library directly (real device or dry-run)labeljetty-hash-password- generates a password hash for a login user
You need Python 3.11+, libusb, and a USB TSPL printer. Set at least PRINTER_USB
(e.g. PRINTER_USB=vid:2d37:pid:62de, found via lsusb) in a .env or the environment, then
run labeljetty and open http://localhost:8888/.
Prefer Docker? The image is
motey/labeljetty.
Heads-up
- No authentication by default - fine on a trusted home LAN, but turn on
AUTH_MODE=protectedbefore exposing it to an untrusted network. - Reference hardware is a Vretti 420B (Poskey-class TSPL, ~203 dpi). It should work with any USB TSPL printer; feedback/PRs for other models are welcome.
More information
Full docs, the configuration reference, authentication, the REST API, printer/udev setup, and Homebox integration live on GitHub: https://github.com/motey/LabelJetty
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