Trezor Bridge — The Definitive Guide & Reference

What Is Trezor Bridge?

Trezor Bridge is a lightweight, local software utility developed by SatoshiLabs that enables secure communication between your Trezor hardware wallet and your computer’s web browser or desktop apps. It acts as a secure bridge (hence the name) that translates between browser requests and USB protocols, allowing Trezor Suite, Trezor Web, or compatible dApps to interact with your device without exposing private keys.

Unlike legacy browser extensions, Bridge runs in the background on your machine and provides an encrypted communication layer. Every critical action—like signing transactions or verifying addresses—must still be confirmed physically on your Trezor device, ensuring your private keys never leave the hardware.

Why Use Trezor Bridge?

Bridge offers several benefits over older connection methods. Here’s why it’s an essential component for your Trezor setup:

How to Install Trezor Bridge

Installing Bridge is straightforward. Here’s a simplified walkthrough:

1. Go to the official Trezor Bridge download page.
2. Select the correct installer for your operating system (Windows / macOS / Linux).
3. Run the installer and follow prompts—on macOS you may need to approve in System Settings / Security.
4. Once installed, reopen your browser or restart your computer if necessary.
5. Connect your Trezor device and open Trezor Suite or supported web app to confirm Bridge is active.

After installation, Bridge often runs automatically in background—no need to manually start it each time.

How Trezor Bridge Works (Under the Hood)

Understanding how Bridge functions helps you trust the tool and troubleshoot issues when needed.

• Local Server: Bridge spins up a local HTTP server on your machine. Web apps connect via localhost to communicate with the Trezor device.
• Secure Channel: All communication is encrypted and authenticated—Bridge doesn’t relay data externally.
• Device Confirmation: The hardware wallet must confirm each transaction or action. Even if a malicious site sends a request, it cannot be approved without your physical action.
• Compatibility Layer: Bridge abstracts USB/transport differences across OS and browsers to provide a unified API to apps.

Troubleshooting & Common Issues

Even with a reliable setup, users sometimes face Bridge-related issues. Here are solutions for the most frequent problems:

• “Bridge is not running” errors: Check that the background service (often called trezord) is active. If not, reinstall Bridge, restart your computer, or check for firewall/antivirus blocking.
• Browser not detecting device: Try switching browsers (Chrome vs Firefox), disable content blockers or ad blockers, or clear cache.
• USB connection problems: Use a different USB cable or port; ensure your Trezor device is properly connected and powered.
• Outdated Bridge: Always keep Bridge at the latest version. Older versions may lack patches or compatibility with newer browser protocols. :contentReference[oaicite:1]{index=1}
• Conflicts with browser updates: Some browsers are shifting toward WebUSB / WebHID APIs—Bridge might become redundant or need fallback support. :contentReference[oaicite:2]{index=2}

Community users also report recurring prompts to install Bridge even after successful installs—this often occurs when the background service isn’t running or autorun is disabled. :contentReference[oaicite:3]{index=3}

Frequently Asked Questions (FAQ)

Do I really need Trezor Bridge?
For most desktop/browser workflows, yes. Bridge ensures smooth connectivity across browsers and ensures your Trezor device is recognized reliably. :contentReference[oaicite:4]{index=4}

Is Bridge secure?
Yes. Bridge is designed with security in mind: no private keys ever leave the hardware device, communication is encrypted, and every action requires physical confirmation. :contentReference[oaicite:5]{index=5}

Which platforms are supported?
Bridge supports Windows, macOS, and Linux systems. Modern browsers like Chrome, Firefox, Brave, and Edge are compatible. :contentReference[oaicite:6]{index=6}

Can I bypass Bridge?
In some cases, WebUSB or WebHID APIs allow direct device communication without Bridge. However, compatibility varies by browser, so Bridge remains the more stable option for many users. :contentReference[oaicite:7]{index=7}

Where should I download Bridge?
Always from the official Trezor website (e.g., Trezor.io/bridge) or via verified links in Trezor Suite. Avoid third-party or suspicious sites. :contentReference[oaicite:8]{index=8}