Official Trézor® Bridge® | Introducing the New Trezor®

What is Trezor Bridge?

Trezor Bridge is a dedicated background service developed by SatoshiLabs that enables seamless communication between your Trezor hardware wallet (such as the Trezor Model One or Trezor Model T) and supported web browsers. Running silently on your operating system, Trezor Bridge translates messages between your browser’s web interface and the physical USB protocol used by hardware devices.

Unlike traditional browser extensions, Trezor Bridge operates as a standalone daemon. This design isolates cryptographic actions from the web environment, protecting sensitive seed phrases and private keys from online exposure or browser-based exploits.

Secure Communication

Acts as an isolated intermediary, routing hardware calls without exposing cryptographic keys to vulnerable browser spaces.

Zero Browser Extensions

Eliminates reliance on Chrome or Firefox extensions, reducing risk exposure to malicious web store add-ons.

Cross-Platform Support

Runs natively as a lightweight background service across Windows, macOS, and Linux operating systems.

Why You Need Trezor Bridge for Cold Storage

Managing digital assets via cold storage requires strict separation between your offline private keys and online networks. When you connect a hardware wallet to a computer via USB, web browsers cannot natively interact with raw USB interfaces safely without standardized protocols.

Trezor Bridge resolves this issue by acting as a local HTTP server (running on 127.0.0.1) that accepts secure API calls from authorized crypto applications. When you initiate a transaction on a web application, the application sends a request to Trezor Bridge. The Bridge translates this into a USB command, prompts you for physical confirmation on your Trezor screen, and sends the signed transaction back to the web app.

Localhost Routing

All data transfers occur strictly between your browser and local system port 21325, preventing external interception.

Physical Signatures

Every outgoing transaction approved via Trezor Bridge still requires physical press verification on your Trezor device.

How to Install and Setup Trezor Bridge

Follow these steps to safely configure Trezor Bridge on your computer:

1
Download from Official Sources Only: Always ensure you are on the verified official domain (trezor.io) before downloading any software or driver binaries.
2
Run the Installer: Execute the setup file for your operating system (.exe for Windows, .dmg for macOS, or .deb/.rpm for Linux).
3
Grant System Permissions: Allow the background service installer to register local communication ports on your system firewall.
4
Connect Your Trezor: Plug your Trezor device into your computer via a direct USB cable and open your preferred web interface or wallet dashboard.
5
Verify Connection: Your browser will automatically detect the device through Trezor Bridge, prompting you to enter your PIN.

Trezor Bridge vs. Trezor Suite

Users often confuse Trezor Bridge with Trezor Suite. While both are developed by SatoshiLabs, they serve distinct operational roles in your hardware wallet workflow.

Feature	Trezor Bridge	Trezor Suite (Desktop App)
Primary Function	Background communication middleware.	Full-featured wallet management interface.
User Interface	No GUI; runs invisibly in system services.	Rich graphical user interface (GUI).
Necessity	Required when using web wallets or third-party dApps.	Bundles its own communication drivers internally.
Supported Applications	Web-based apps (MetaMask, Web Suite, Third-party dApps).	Standalone native desktop dashboard.

Troubleshooting & Security Recommendations

If your web browser fails to detect your Trezor hardware wallet, check the following common resolution steps:

Check Service Status

Ensure the trezord background process is running in Windows Task Manager or macOS Activity Monitor.

Avoid Phishing Scams

Trezor Bridge will NEVER ask for your 12-word or 24-word recovery seed. If a prompt requests your seed phrase, close the window immediately.

Use Direct USB Connections

Avoid using unpowered USB hubs or extension cables, which can interrupt communication or power stability during signature generation.