Trezor Bridge

Overview

Trezor Bridge is (or historically has been) a small local application that acts as a secure intermediary between a Trezor hardware wallet and your desktop environment — mainly the Trezor Suite app and supported web wallet integrations. It runs locally and makes device communications reliable across different browsers and operating systems without exposing private keys to the web.

Important: in recent product updates the standalone Bridge installation has been phased out in favor of the Trezor Suite which bundles device connectivity. If you use modern Trezor Suite builds, a separate Bridge installation is often unnecessary.

How it works (high level)

Instead of relying solely on direct browser USB APIs, Bridge acts like a local server on your machine. When you connect the Trezor device and open Trezor Suite or a compatible web app, the app talks to Bridge over a secure local channel. Bridge then forwards encrypted commands to the device. The device signs transactions on-device; private keys never leave the hardware wallet.

• Local daemon: runs on your computer and accepts requests from allowed apps.
• Encrypted channel: commands are proxied so the hardware signs or approves actions without exposing secret data.
• Compatibility: provides consistent connectivity across browsers and OS versions.

Download & installation

If you need a standalone Bridge (legacy setups or certain integrations), the official Trezor site has installers for macOS, Windows and Linux. However, newer Trezor Suite releases include the necessary connectivity, so most users who run the Suite do not need a separate Bridge installation.

Troubleshooting tips

If your browser or desktop app doesn't detect your Trezor device:

• Try a different USB cable or USB port (preferably a direct port, not a hub).
• Restart the browser and, if Bridge was installed standalone, restart the Bridge service (or reinstall if needed).
• Ensure you use the official Trezor Suite or verified third-party wallets — never install random browser extensions promising Bridge functionality.
• If you previously installed an old standalone Bridge and you use the modern Suite, consider removing the standalone Bridge to avoid conflicts.

Security best practices

Bridge's job is only to relay messages — it does not, and cannot, read your recovery seed or private keys. Still, follow these rules:

• Download installers and updates from the official Trezor website or verified package managers.
• Verify checksums or signatures if provided for installers before running them.
• Keep firmware and Trezor Suite up to date to benefit from the latest security fixes and compatibility improvements.
• Never enter your seed into a computer or online form — seed entry belongs only on the device (or paper kept offline).

FAQ

Notes for developers

For integration with third-party wallet apps, Trezor provides developer tools (Trezor Connect) and documentation to ensure interactions are secure and consistent. If you ship a web wallet, follow the guidelines so users can safely connect their devices and sign transactions.

// Example: detect Bridge (pseudo)
// In production use the official Trezor Connect libraries and docs
if (window.TrezorConnect) {
  TrezorConnect.getInfo().then(info => console.log(info));
}