WebApp Hardware Bridge (Web Direct Print, Web Serial Port)

WebApp Hardware Bridge (succeeder of “Chrome Hardware Bridge / Chrome Direct Print”)

Make it possible for WebApps to perform silent print and access to serial ports.

Common use cases:

  • Web-based POS – PDF and receipt silent print
  • Web-based WMS – Serial weight scale real-time reading


  • Direct print from webpage
  • Serial read/write from webpage
  • Support all modern broswers that implemented WebSocket (Chrome, Edge, Firefox… etc)
  • JS SDK/Example included

Web Direct Print

  • 0-click silent printing in web browsers
  • Download via URL / Base64 encoded file / Base64 encoded binary raw command
  • Support multiple printers, mapped by key
  • Support PDF/PNG/JPG Printing
  • Support RAW/ESC-POS Printing

Web Serial Access

  • Bidirectional communication
  • Serial weigh scale (AWH-SA30 support in SDK)
  • Support multiple ports, mapped by key
  • Support multiple connection share same serial port

How to use?

Client Side

  1. Install and setup mapping via Configurator
  2. Start “WebApp Hardware Bridge” and it should works

WebApp Side

  1. Check JS SDK/Example

How it works?

WebApp Hardware Bridge is a Java based application, which have more direct access to hardwares.
It expose a WebSocket server on localhost which accept print jobs and serial connection.

For print jobs, PDF/Images job are downloaded/decoded and then sent to mapped printer.
Raw job are sent to mapped directly.

For serial port, serial port are opened by Java and “proxified” as WebSocket stream,
which allow bidirectional communcations.

Configurator is provided to setup mappings between keys and printers/serials.
Therefore web apps do not need to care about the actual printer names.

Source Code & Downloads

Source Code: https://github.com/imTigger/webapp-hardware-bridge

Windows Binary: https://github.com/imTigger/webapp-hardware-bridge/releases

Mac/Linux: Coming soon, or compile it yourselves

6 Replies to “WebApp Hardware Bridge (Web Direct Print, Web Serial Port)”

  1. The CPU load when running “WebApp Hardware Bridge” seems very high (constant 30%). Is this normal?

    1. I had the dame issue, Open the configurator, right click and delete the weigh Serial COM3 , sabe and close

    2. “I had the dame issue, Open the configurator, right click and delete the weigh Serial COM3 , sabe and close”
      that solution worked great

  2. Hello, thank you for this useful software! It would be helpful to have 32-bit version on Windows. Can you produce it for us?

    1. If you follow the instructions for “compile from source”, using the 32-bit version of all software and libraries involved, the result will be 32-bit. We tried it and it worked.

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