Trezor Bridge is the official communication layer that allows your Trezor hardware wallet to connect safely with web browsers or desktop tools. It plays a key role in enabling your crypto security.
Trezor Bridge is a lightweight background application that runs on your computer and provides a secure, local API for browser-based and desktop wallet applications to communicate with your Trezor device. Instead of using old-style browser plugins, Bridge handles USB or HID access and relays messages securely — while your private keys remain on the hardware wallet.
When you plug your Trezor device into your computer, Bridge detects it and runs as a local service.
Your browser (or Trezor Suite) connects to Bridge via a secure localhost endpoint.
Bridge translates web app commands into device-level USB/HID commands.
All sensitive operations — like signing a transaction — require physical confirmation on your Trezor device.
Bridge was created to solve compatibility and security challenges:
Cross-platform support: Works on Windows, macOS, and Linux. :contentReference[oaicite:0]{index=0}
Browser compatibility: Supports browsers that may not allow direct USB access, making hardware wallet interaction more reliable. :contentReference[oaicite:1]{index=1}
Secure design: Keeps private keys on-device. Bridge only forwards messages and never stores or transmits your recovery seed. :contentReference[oaicite:2]{index=2}
Important: Trezor has officially deprecated the standalone Bridge application. :contentReference[oaicite:3]{index=3} Many newer workflows instead rely on the Trezor Suite, or use modern browser APIs like WebUSB when supported. :contentReference[oaicite:4]{index=4}
If you still have Bridge installed, Trezor provides uninstall instructions for Windows, macOS, and Linux. :contentReference[oaicite:5]{index=5}
Go to the official Trezor Bridge page: trezor.io/bridge.
Select the correct installer for your operating system (Windows, macOS, Linux). :contentReference[oaicite:6]{index=6}
Run the installer and follow on-screen instructions. If on macOS, allow Bridge in Security & Privacy settings if needed.
Restart your browser after installation so it detects Bridge.
Plug in your Trezor, open a compatible wallet or dApp, and grant Bridge permission to communicate.
Download only from the official source: Use trezor.io/bridge to avoid fake or malicious Bridge installers. :contentReference[oaicite:7]{index=7}
Verify signatures/checksums: When checksums or PGP signatures are provided, verify them to ensure authenticity. :contentReference[oaicite:8]{index=8}
Keep Bridge updated: Although it's deprecated, updates may still fix bugs or improve compatibility. :contentReference[oaicite:9]{index=9}
Uninstall if migrating: If you’re moving to Trezor Suite or a WebUSB-enabled browser, remove the standalone Bridge to avoid conflicts. :contentReference[oaicite:10]{index=10}
Trust only your device: Always verify transaction details (amount, address) on your Trezor screen before approving. Bridge does not bypass on-device confirmation.
You might need Bridge in the following cases:
You’re using a browser that does not support WebUSB (or it’s not enabled).
You rely on legacy wallet integrations or third-party wallets that specifically require Bridge. :contentReference[oaicite:11]{index=11}
You are on an operating system or configuration where Suite’s built-in transport is not preferred.
But for many users, Trezor recommends using Trezor Suite (desktop or web) rather than managing Bridge separately. :contentReference[oaicite:12]{index=12}
Here are some common problems and how to fix them:
Device not detected: Try a different USB port or cable, restart Bridge, or re-install the latest version from the official site.
Browser not connecting: Close and reopen your browser after installing Bridge; make sure it has permissions to access localhost.
Bridge conflict with Suite: Uninstall the standalone Bridge if you're switching to Trezor Suite to avoid duplicated services. :contentReference[oaicite:13]{index=13}
If you're a developer, Trezor Bridge historically provided a stable local API, often used in conjunction with Trezor Connect to integrate wallet functionality in applications. :contentReference[oaicite:14]{index=14}
However, with newer Trezor workflows, such as using Trezord or leveraging WebUSB in modern browsers, Bridge may no longer be required for fresh integrations. Check Trezor’s developer docs for the latest guidance.
Bridge was introduced to address technical limitations of older browsers and operating systems — particularly to replace deprecated browser extensions and to provide a trusted, minimal, local communication layer. :contentReference[oaicite:15]{index=15} It enabled Trezor devices to be detected reliably across platforms without compromising key security.