Frequently asked questions

Do I need a Zebra printer to use zplCloud?

No. You can design and preview labels as PNG, PDF and SVG in the browser without any hardware. Printing is available the moment you connect a printer - locally, via the Weblink relay or through a remote CLI agent.

How do remote printers work through a firewall?

A zplCloudCli agent runs on any machine in the printer's LAN (PC, Raspberry Pi, Synology, Docker) and opens a single outbound WebSocket connection to our backend - TeamViewer-style. No inbound ports, no port forwarding, no firewall changes on the customer side.

Which barcode symbologies are supported?

30+ verified symbologies including QRCode, DataMatrix, Pdf417, Aztec, MaxiCode, EAN/UPC, Code128/39/93, GS1-128, Postnet and Planet - all verified for correct ZPL output.

Does it support RFID / EPC labels?

Yes. The designer includes an RFID element for EPC Class 1 Gen 2 tags with the SGTIN-96 data structure - GTIN + serial are encoded to EPC hex with a full decode roundtrip, and output as ^RS / ^RB / ^RFW ZPL.

How does the Weblink relay keep connections alive?

The relay proactively probes every printer with ! U1 getvar "device.unique_id", tracks per-printer keepalive timestamps, cleans up duplicate connections and re-sends failed jobs from the queue.

In which languages is the platform available?

German, English and Portuguese. Light and dark themes follow your OS preference automatically and all UI strings live in a single translation dictionary.