About Virtual Printer

Virtual Printer is a hosted thermal printer emulator that lets developers test receipt and label printing without physical hardware.

What is Virtual Printer?

Virtual Printer speaks ESC/POS and EPL over a network socket, the way a real receipt or label printer does. Instead of purchasing physical network printers, you can create virtual thermal printers that emulate real hardware for testing POS printing applications.

Send print commands over a raw TCP socket exactly as you would to a network printer — the same JetDirect/AppSocket stream physical thermal printers accept on port 9100 — and view the rendered documents in real-time through our web interface. Test ESC/POS and EPL commands without requiring physical devices.

The hosted service listens on real, public raw TCP ports. virtual-printer.online is always online, and every printer you create is given its own permanent port in the 9100 block. There is no HTTP wrapper to work around, no browser extension, and nothing to install locally: open a socket to virtual-printer.online:<your port>, write your ESC/POS bytes, close the connection, and the receipt appears in the browser.

Create printers with different paper widths and configurations to test how your documents render across various printer models and hardware specifications. Perfect for developers building point-of-sale systems, receipt/label printing APIs, or any application requiring thermal printer testing.

Key Features

Public Raw TCP Port — Always Online

Each virtual printer gets its own raw TCP listener on the public internet, the same way a network thermal printer listens on port 9100. Ports are assigned from the 9100 block and belong to the printer permanently, so your POS application can keep a fixed host:port in its configuration.

Real-Time Document Preview

View print jobs as they're processed with accurate rendering of text, images, and formatting.

Printer Protocol Emulation

Virtual printer simulator supporting printer command languages:

• ESC/POS Emulator - Test receipt printer commands
• EPL Emulator - Test Eltron label printer commands
• TSPL Emulator - (In development) TSC printer command testing

ESC/POS thermal printer emulation includes:

• Text formatting (bold, underline, alignment)
• Character sizing and spacing
• Image printing
• Paper cutting commands

Multi-Printer Management

Create and manage multiple virtual printers per workspace with individual configurations.

Workspace Sharing

Share your entire workspace across devices and team members, enabling collaborative development and document review.

Buffer Emulation

Simulate real printer behavior with configurable buffer capacity and drain rates.

Perfect For

• POS Development: Test receipt printing without physical thermal printers
• API Testing: Develop and test printing integrations without hardware
• ESC/POS Development: Debug receipt printer commands and formatting
• Label Printer Testing: Test EPL and other label printing protocols
• Mock Printer Testing: Simulate network printers for development environments
• Remote Development: Share virtual printers with distributed teams
• Demo Environments: Showcase printing functionality without hardware setup
• Controlled Conditions: Reproduce, on demand and through the API, what is awkward to stage on real hardware — a full input buffer, a slow drain rate, paper out mid-receipt, an open cover, an offline printer — and check how your POS application behaves

Where to go next

• Quick start — workspace, printer, and first receipt in about five minutes
• Raw TCP port 9100 — what the port is, how it is assigned, how long it lasts
• How it works — what happens between your socket and the rendered receipt
• Choosing a test printer — whether this is the right tool for your case
• CI/CD and automated tests — driving the printer from test code

Support

Questions or issues? See the FAQ, the troubleshooting guide, or email support@virtual-printer.online.