Trezor Bridge® — The Secure Gateway to Your Hardware Wallet®

Trezor Bridge is a lightweight application that securely connects your Trezor hardware wallet® to Trezor Suite®, web wallets, and other compatible host software. It handles low-level USB communication, isolates device access from the browser, and makes interactions fast, private, and deterministic. This page explains what Bridge does, how to install and troubleshoot it, and why it’s an essential layer of secure hardware-wallet usage.

What is Trezor Bridge?

Trezor Bridge is a small background application installed on your computer that acts as a secure intermediary between your Trezor device and web-based or desktop host applications. Because modern browsers restrict direct access to USB devices for security reasons, Bridge provides a controlled, authenticated channel so web apps (like Trezor Suite) can communicate with your hardware wallet while reducing platform-specific quirks.

Why Bridge matters for security

Trezor Bridge reduces attack surface by keeping USB-level handling out of untrusted browser contexts. It performs strict device enumeration, enforces origin checks, and only grants access to approved host origins. Crucially, the private keys never leave the device — Bridge only forwards signed commands and responses. Using Bridge properly helps prevent host-based attacks like address replacement or trojanized browser extensions from silently manipulating transactions.

Key features at a glance

Cross-platform

Runs on Windows, macOS, and Linux.

Browser friendly

Enables web apps to connect safely without direct USB privileges.

Secure pairing

Ensures the host and device are authenticated before sensitive operations.

Minimal footprint

Small, auto-updating installer with low system overhead.

Install & update — quick steps

Download the installer from the official Bridge page at trezor.io/bridge.
Run the installer and follow platform prompts. On macOS you may need to allow the app in Security & Privacy settings.
After installation, open Trezor Suite or your web wallet — the suite will detect Bridge automatically.
Keep Bridge up to date; updates include security fixes and compatibility improvements. Use the official page to get the latest release.

Troubleshooting common issues

Bridge not detected? Ensure Bridge is running (check system tray or background processes) and that you have the correct permissions. Try restarting Bridge and the browser. If the device still isn’t detected, verify your USB cable (use the original cable or a data-capable cable) and try a different USB port.

Browser warning or blocked connection? Some browsers may block local connections by default. Ensure the host origin (e.g., suite.trezor.io) is permitted to connect and that no aggressive privacy extensions are blocking localhost requests.

Driver issues on Windows? Use the installer from the official Bridge page which bundles necessary drivers, or follow the driver instructions in Support.

Privacy considerations

Trezor Bridge only facilitates communication and does not collect wallet data or private keys. Telemetry, if present, is minimal and strictly opt-in. For privacy, avoid installing Bridge from third-party mirrors — always use the official download links. When connecting to web apps, verify the origin (URL) and ensure you are on the official Trezor Suite or other trusted host.

Developer notes

If you are building an integration, Trezor provides SDKs and documentation to interact with devices over Bridge. The Bridge uses a well-documented protocol and supports deterministic command patterns for signing, key derivation, and firmware operations. Refer to the developer resources and GitHub for examples, client libraries, and API details.

Compatibility matrix

Bridge supports Windows 10/11, modern macOS versions, and common Linux distributions. It works with major browsers including Chrome, Edge, and Firefox (with host permission). Mobile platforms typically rely on direct USB or OTG solutions — check the developer guide for mobile-specific notes.

Best practices for safe use

Download Bridge only from trezor.io/bridge.
Verify manifests and signatures if you are using advanced deployment or package managers.
Keep your OS, browser, and Bridge updated.
Confirm transaction details on the Trezor device screen rather than relying solely on host UI.
Use official support channels if you suspect tampering or abnormal behavior.

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Trezor Bridge — The Secure Gateway to Your Hardware Wallet®