Trezor Bridge® — Connect Your Trezor to Web Browsers

A concise, practical 700-word guide explaining what Trezor Bridge does, why it’s useful for browser-based wallets, how to install it, and simple security tips.

What is Trezor Bridge?

Trezor Bridge is a small, locally running application that acts as a bridge between web browsers (and some desktop apps) and your Trezor hardware wallet. Instead of having each web page attempt low-level USB access, the browser talks to the Bridge on localhost, and the Bridge forwards validated requests to the connected device. This centralizes connectivity, simplifies compatibility across operating systems, and preserves the core security model: all sensitive signing operations happen on the Trezor device itself.

Why use Bridge with browser wallets?

Compatibility: Provides a consistent interface for wallets and dApps across Windows, macOS, and Linux.
Security: Limits direct USB access from web pages; the device itself requires physical confirmation for signatures.
Developer friendliness: High-level SDKs like trezor-connect target the Bridge API, making integration easier.
Fallback: Works where browser-native WebUSB support is limited or blocked by policy.

Quick install & setup

Install Bridge only from official sources and follow these steps for a typical setup:

Download the Bridge installer for your OS from the official site.
Run the installer and approve any OS prompts for USB access or permissions.
Plug in your Trezor device and unlock it with your PIN.
Open your browser wallet or web app — when prompted, allow the connection to localhost and confirm actions on the device screen.

Download Trezor Bridge

Browser support & behavior

Modern Chromium-based browsers and Firefox can interact with Bridge through localhost calls or WebUSB. Browser permission prompts are expected; always verify the origin requesting access. Some browsers may prefer WebUSB (direct access) when available, but Bridge offers a more uniform experience across environments and prevents reliance on experimental browser APIs.

Security essentials

Private keys stay on-device: Bridge never exposes your seed or private keys — the Trezor signs transactions after you confirm them on the device.
Verify on-device: Always check addresses and amounts on the Trezor display before approving.
Official sources only: Download Bridge from official channels and verify checksums if provided.
Host hygiene: Keep your computer updated and avoid running untrusted software or extensions while interacting with crypto assets.

Troubleshooting tips

If a browser or wallet can’t see your device: confirm Bridge is running (system tray or process list), try a different USB cable/port, restart the browser, and ensure no other app is locking the USB device. On Linux, confirm udev rules and permissions. If problems persist, consult official support documentation — and never share your recovery phrase with anyone.

FAQ — short answers

Do I always need Bridge? Not always — some users rely on direct WebUSB or Trezor Suite which bundles connectivity. Bridge is helpful when browser or system compatibility requires it.

Is Bridge safe? Yes, when downloaded from official sources and used on a secure host. It’s a local relay; the device enforces final confirmations.