Trezor Bridge® | Official: Secure Your Access

Welcome to the official setup guide for Trezor Bridge® — the trusted communication tool that connects your Trezor hardware wallet to supported browsers and applications. This document will walk you through what Trezor Bridge is, why it’s necessary, how to install it, and how to ensure your connection is always secure.

What Is Trezor Bridge?

Trezor Bridge® is a background service (or software interface) that enables secure, encrypted communication between your Trezor hardware wallet and web-based wallets or apps (like Trezor Suite or third-party integrations).

Without Trezor Bridge, browsers may not be able to detect or communicate with your wallet, especially on systems that do not support WebUSB or where native communication is blocked.

Why You Need Trezor Bridge

Securely connects Trezor wallet to web applications
Works as a lightweight background tool
Acts as a middleware for legacy browsers or OS configurations
Maintains secure local communication without exposing private keys

Important: Trezor Bridge does not access your funds or read your recovery seed. All sensitive data stays inside your hardware wallet at all times.

Before You Install

Ensure you’re downloading from the official site: https://trezor.io/bridge
Make sure your Trezor device is ready and functional
Unplug your device before starting installation
Disable any fake or pirated Trezor apps

How to Install Trezor Bridge

Go to the official Bridge download page: trezor.io/bridge
Download the installer for your OS (Windows, macOS, Linux)
Run the installer and follow on-screen prompts
After installation, restart your browser
Plug in your Trezor device
Visit Trezor Suite Web to test connectivity

Supported Operating Systems

Trezor Bridge supports most major OS platforms:

Windows 10/11+
macOS 10.14+
Linux (Ubuntu, Debian, Arch)

How It Works

Trezor Bridge runs quietly in the background. When you launch a compatible application like Trezor Suite Web or MetaMask (with Trezor integration), the app sends commands to the Bridge via a secure local connection (typically localhost).

Bridge then communicates directly with your Trezor hardware wallet through USB, allowing cryptographic operations (like transaction signing) to happen entirely on the device.

Localhost Interface

You may notice Bridge running at http://127.0.0.1:21325 – this is normal. It does not connect to the internet and only listens to your computer’s internal apps.

Security Features

Local-only communication (never transmits over internet)
Encrypted USB traffic
Authenticates signed messages
Prevents key extraction or spoofing

Verifying You’re Using the Real Bridge

Here’s how to ensure your Bridge is genuine:

Download only from trezor.io
Verify the digital signature of the installer
Check that the running process is signed by SatoshiLabs (on Windows/macOS)
Use system tools to monitor the service: e.g. Activity Monitor or Task Manager

⚠ WARNING: Never install browser extensions or “Bridge alternatives” that claim to connect Trezor. These can be phishing attempts designed to steal funds.

Troubleshooting Common Issues

1. Bridge Not Detected

If your browser says “Trezor Bridge not installed”:

Ensure it's running (check processes)
Restart your computer
Disable browser extensions interfering with USB

2. Device Not Recognized

Try:

Switching USB ports
Using a different cable (data + power)
Verifying that your system sees the device

3. Bridge Keeps Asking to Reinstall

This may be caused by:

Old browser cache or cookies
Multiple users on the same PC
Antivirus blocking the port

Try clearing browser cache and ensuring Bridge is running as administrator.

Bridge vs WebUSB

Some browsers (like Chrome) support WebUSB, which can connect to Trezor devices directly without Bridge. However, Bridge remains necessary for:

Firefox and Safari compatibility
Legacy system support
Stability and fallback if WebUSB fails

Keeping Bridge Updated

Periodically check for new versions at trezor.io/bridge. Older versions may lack support for new Trezor Suite features or updated OS compatibility.

When updating:

Uninstall the old version
Restart your system
Install the new version from the official site