If you're still printing shipping labels on A4 paper, cutting them with scissors and sticking them on (sometimes crooked, sometimes coming loose), you know the pain. It's fine for two or three orders a day. But once you're shipping twenty or thirty, that little ritual starts eating into your time. That's when the question of "ZPL" and thermal printers comes up. Here's a clear answer.
In short: PDF is for printing on a standard printer and sticking on by hand. ZPL is the format for thermal label printers (Zebra and compatibles), which print a ready-to-use self-adhesive label, no ink required. A few shipments a day? PDF is fine. High volume? A thermal printer with ZPL saves you time and money. On ParcelRush, you get both formats and use whichever fits your workflow.
What is ZPL?
ZPL stands for Zebra Programming Language. In practice, it's the "language" that Zebra thermal printers and compatible models understand. Instead of generating a PDF, opening it and sending it to print, the system talks directly to the printer in ZPL and the label comes out immediately, in the right format, without ink or toner. It's what almost everyone uses once volume starts to matter.
ZPL or PDF: the difference day-to-day
| ZPL | ||
|---|---|---|
| Printer | Standard (laser/inkjet), A4 sheet | Thermal (Zebra and compatibles), roll |
| Output | Print, cut, stick | Self-adhesive label, ready to use |
| Consumables | Ink/toner to restock regularly | No ink, only label rolls |
| Speed | Slow at volume | One click per label |
| Best for | Low shipment volumes | Dozens or hundreds per day |
The real difference isn't technical, it's about time. With PDF, every label is a mini-ritual: open, print, cut, stick. With ZPL and a thermal printer, one click and it's ready to apply. Multiply that by dozens of orders and you'll understand why no one goes back once they've made the switch.
When is a thermal printer worth it?
Honest answer: don't complicate things early on. If you're shipping a handful of parcels a day, a standard printer and PDF work perfectly fine. The thermal printer starts to make sense when the print-cut-stick routine becomes a genuine bottleneck, typically from around ten to fifteen shipments a day. You gain speed, stop buying ink cartridges, labels don't smear, and you stick far fewer things on crooked.
How to choose your printer (without overcomplicating it)
No need to research the whole market. Three or four points are enough:
- Look for a thermal label printer. Zebra is the benchmark, but there are compatibles at a much lower price point that also speak ZPL.
- Direct thermal or thermal transfer? Direct thermal prints using only heat, no ribbon or ink, cheaper and perfect for shipping labels which have a short lifespan. The print can fade over time and with light, but it doesn't matter: the parcel arrives in days. Thermal transfer uses a ribbon and lasts much longer, which only matters for labels that need to endure (warehouse labels, for example). In model names, D means direct and T means transfer (e.g. Zebra GK420D / GK420T). For e-commerce, direct thermal is enough and costs less.
- 203 dpi is sufficient. No need to pay for 300 dpi on shipping labels: 203 dpi produces clean, readable results.
- 10 x 15 cm (4 x 6 inches) is the standard size for courier labels; just check that the model supports it.
USB or network connection depending on your workstation is a minor detail to sort at setup.
How it works on ParcelRush
You generate the shipment label and choose: PDF to print and stick, or ZPL for your thermal printer. And there's an extra advantage once you switch to thermal: with a thermal printer, ParcelRush prints directly, in one click. The label comes out immediately, without having to download and open a PDF for each order. In PDF mode, you download and print by hand, as usual.
That's one more reason to move to thermal as you grow: you start with PDF and, as volume increases, you gain direct printing without changing your tool.
If you're selling on Shopify or WooCommerce, take a look at our guide to the most common shipping problems, and how to optimise your shipping operations to stop losing time on repetitive tasks.
👉 Generate your labels in PDF or ZPL and print directly to thermal. Try the platform
Frequently asked questions
What is ZPL?
It's the format used by thermal label printers (Zebra and compatibles). Instead of a PDF to cut out, the label comes out already self-adhesive, no ink required.
Do I need a special printer for ZPL?
Yes, a thermal printer. For PDF, a standard printer is enough.
ZPL or PDF: which should I choose?
PDF if you ship a small number of parcels; ZPL with a thermal printer when volume justifies the time savings, typically from around ten to fifteen shipments per day.
Can I print without downloading the PDF?
Yes, with a thermal printer: ParcelRush sends the label directly to the printer, in one click. With PDF, you download and print manually.
What label size should I use for shipping?
The standard is 10 x 15 cm (4 x 6 inches).
Maëlle Lemarchand CEO of ParcelRush. 15 years in web, UI/UX and e-commerce. Writes about shipping and logistics. LinkedIn →
