Trezor Bridge — Desktop Connector for Trezor Hardware Wallets

What is Trezor Bridge?

Trezor Bridge is the official application that runs on your computer and acts as a secure communication layer between a Trezor hardware wallet (Trezor Model T, Trezor One, and variants) and web-based or desktop wallet applications. It replaces older browser plugin models by providing a local HTTP endpoint that wallet software uses to talk to the device without exposing private keys to the internet.

How it works — the basics

Trezor Bridge listens on a local port and forwards encrypted messages to the Trezor device over USB. The device itself performs sensitive cryptographic operations inside its secure chip; Bridge merely transports signed commands and results between the device and your wallet UI. Bridge does not hold your seed or private keys.

• Local communication only — Bridge facilitates USB communication on localhost.
• Encrypted transport between the browser/app and the device is managed by the Trezor firmware.
• Bridge is lightweight and designed only to enable connectivity for wallet apps.

Installing and updating

Installation is straightforward: download the official installer from the Trezor website, run it, and follow platform prompts. Bridge runs on Windows, macOS, and Linux. Keep it up to date—updates include bug fixes, new device support, and security improvements.

1. Visit the official Trezor site (always verify the domain and SSL certificate).
2. Download the Bridge installer for your OS.
3. Run the installer and allow necessary system permissions (USB access on macOS), then reboot if prompted.
4. After installation, connect your Trezor and open your wallet app (Suite, web wallet, or compatible third-party wallets).

Compatibility and supported setups

Bridge is compatible with modern browsers and major wallet applications that support Trezor devices. Some wallet apps may embed their own connectivity layer—consult the wallet documentation. For headless or server setups, Bridge is designed primarily for desktop/local usage rather than remote server hosting.

Security considerations

The most important security points:

• Your seed/private keys never leave the Trezor device. Bridge never stores or transmits those secrets externally.
• Always download Bridge from the official Trezor website and verify site authenticity.
• Keep your OS and browser patched — local attacks rely on compromised host machines.
• When prompted on the Trezor device to confirm an action (address, transaction), verify details on the device screen — never rely solely on the computer UI.

Troubleshooting common issues

Problems often have simple fixes:

• Device not recognized: unplug and replug the USB cable, try a different USB port, confirm cable supports data (not charge-only).
• Bridge not running: check your system tray/menu bar for the Bridge icon, or restart the computer.
• Browser can't connect: ensure no other app is blocking the local port; temporarily disable aggressive firewall rules.
• Permission prompts on macOS: grant the app permission to access USB in System Settings → Privacy & Security if prompted.
• Signature/transaction mismatch: always confirm values on the Trezor device screen before approving.

FAQs

Do I need Bridge for every Trezor? Yes — if you're using desktop or web wallets that rely on the local connector, Bridge or an equivalent connectivity option is required.

Is Bridge open source? Parts of Trezor's software ecosystem are open source; check the official Trezor repositories for details.

Can I run Bridge on a server? Bridge is intended for local desktop use. Running it on exposed servers risks security and is not recommended for standard wallet workflows.