QZ Tray Alternative

A lighter way to print from browser web apps.

If you're evaluating QZ Tray for browser-to-printer communication, the BrioLabel Desktop Agent solves the same core problem — letting a web app print to local label and receipt printers — without a Java runtime, without paid certificates, and without a warning dialog on every print.

Download the Agent View the BLPD specification on GitHub

BrioLabel Desktop Agent vs. QZ Tray

A side-by-side look at the two approaches to browser printing.

Aspect	QZ Tray	BrioLabel Desktop Agent
Runtime	Bundles a full Java runtime (JRE)	Native app — no Java, no bundled runtime
Install size	Well over 100 MB, due to the bundled JRE	Around 3 MB
Idle memory use	Typically well over 100 MB, JVM overhead	Single-digit MB
Silent printing	Requires a paid certificate from QZ Industries	Free, no certificate purchase required
Pairing & trust		Requests are cryptographically signed; the Agent asks for manual approval the first time a site connects, and you can view paired clients and revoke access anytime
Print format	Raw, printer-specific commands (ZPL, ESC/P) sent by your app	BLPD — one open, printer-independent document format
What your app builds	Printer-specific command strings, by hand	A single BLPD document — the Agent handles translation to ZPL, TSPL or Brother Raster
License	Free tier available; paid tiers for certificates and support	Free, always

Why teams look for a QZ Tray alternative

QZ Tray runs on a bundled Java Virtual Machine, which means a heavier install and more background memory use than a small native app needs.
Silent, prompt-free printing requires purchasing and installing a signing certificate from QZ Industries.
Without that certificate, browsers show a permission dialog on every single print — a rough experience at a checkout counter or a busy warehouse pack station.
QZ Tray sends raw, printer-specific commands — your application still has to generate correct ZPL, TSPL, or ESC/P for every printer model you support.
Antivirus software sometimes flags or contains the bundled Java runtime, adding IT overhead for teams deploying to many machines.

The format underneath

BLPD: one document, any printer.

The BrioLabel Desktop Agent doesn't invent a new proprietary protocol. It renders BLPD (BrioLabel Print Document) — an open, printer-independent specification. Your application generates one fully-resolved BLPD document; the Agent translates it to ZPL, TSPL, or Brother Raster depending on the target printer.

Fully resolved — the generator has already measured, wrapped, and positioned everything. The Agent never makes layout decisions, it only prints.
Printer-independent — the same document prints correctly on a Zebra, a TSC, or a Brother printer.
Open — the specification is public. Other renderers besides the BrioLabel Desktop Agent are welcome to implement it.

What sending a print job looks like

A minimal example: connect to the local Agent over WebSocket and send a BLPD document.

JavaScript — browser to Agentconst socket = new WebSocket("wss://localhost:9443/agent");

socket.onopen = () => {
  socket.send(JSON.stringify({
    printerId: "printer-001",
    copies: 1,
    document: blpdDocument // a fully-resolved BLPD document
  }));
};

socket.onmessage = (event) => {
  const result = JSON.parse(event.data);
  console.log("Print job status:", result.status);
};

BLPD — the document being sent{
  "specVersion": "1.0",
  "document": {
    "unit": "mm",
    "pages": [
      {
        "width": 101.6,
        "height": 152.4,
        "layers": [
          {
            "id": "default",
            "nodes": [
              {
                "type": "text",
                "frame": { "x": 10, "y": 10, "width": 80, "height": 10 },
                "text": "John Doe",
                "style": { "font": { "family": "Arial", "size": 12 }, "color": "#000000" }
              },
              {
                "type": "barcode",
                "frame": { "x": 10, "y": 30, "width": 80, "height": 20 },
                "data": "123456789",
                "symbology": "code128"
              }
            ]
          }
        ]
      }
    ]
  }
}