Secure Connection for Your Digital Assets
Trezor Bridge is the essential background application that allows your Trezor hardware wallet to communicate securely with your web browser.
What is Trezor Bridge?
Understanding the critical link between your cold storage and the digital world.
Trezor Bridge is a lightweight communication daemon that runs in the background of your computer. It was designed to replace the older Chrome extension system, providing a more robust and browser-independent way for your Trezor hardware wallet to interact with web-based interfaces like Trezor Suite Web, third-party wallets (like MetaMask or MyEtherWallet), and other compatible services.
Unlike browser extensions which are limited by the browser's sandbox and update cycles, Trezor Bridge operates as a standalone system service. This architecture allows for direct, low-level communication with the USB device, ensuring that transaction data is passed accurately and securely without interference from malicious browser scripts or extensions.
- Browser Independent: Works with Chrome, Firefox, Brave, and more.
- Background Service: Runs silently without user intervention.
- Enhanced Security: Reduced attack surface compared to plugins.
Daemon Process
Runs locally on 127.0.0.1:21325, listening only to local requests.
Isolated
Operates outside the browser memory space for better isolation.
Universal
Standardized protocol for all Trezor models (One, Model T, Safe 3).
Efficient
Minimal system resource usage, active only when needed.
Why You Need Trezor Bridge
Uncompromised Security
By moving the communication logic out of the browser, Trezor Bridge minimizes the risk of browser-based attacks such as malicious extensions reading your data. It creates a direct, encrypted tunnel between the device and the authorized application.
Superior Performance
WebUSB (the alternative connection method) can sometimes be unstable or incompatible with certain OS configurations. Trezor Bridge offers the most reliable and fastest data transmission rates for signing large transactions or loading account histories.
Broad Compatibility
While modern browsers support WebUSB, many legacy systems and privacy-focused browsers do not. Trezor Bridge ensures you can access your funds regardless of your browser choice or strict privacy settings that might block USB access.
How Trezor Bridge Works
When you connect your Trezor device via USB, the Bridge detects the hardware handshake. It then opens a local WebSocket server (typically on port 21325).
When you visit a compatible website (like wallet.trezor.io), the site sends a request to this local port. The Bridge verifies the origin of the request (CORS) to ensure only authorized domains can communicate with your device.
USB Connection
Physical connection is established and detected by the OS kernel.
Bridge Handshake
Trezor Bridge claims the USB interface and prepares for commands.
Application Request
The web wallet sends a JSON payload to the Bridge via localhost.
User Confirmation
Critical actions are displayed on the Trezor screen for physical confirmation.
Installation & Requirements
System Requirements
- Windows: Windows 10 or newer (64-bit)
- macOS: macOS 10.14 (Mojave) or newer
- Linux: x86_64 (rpm/deb) or ARM (tar)
- Android: Supported via WebUSB (Bridge not required)
- iOS: Not supported due to lightning/USB restrictions
Installation Guide
- Download the installer
Always download from the official source (trezor.io/start).
- Run the executable
Double-click the downloaded file (trezor-bridge-2.0.33.exe/dmg).
- Grant Permissions
Allow the application to make changes to your device if prompted.
- Clear Browser Cache
Sometimes required to force the browser to detect the new bridge.
Security Warning
Never download Trezor Bridge from third-party file hosting sites. Always verify the URL is trezor.io. Malicious versions of the bridge can compromise your wallet security.
Frequently Asked Questions
Common questions about setting up and using Trezor Bridge.
Ready to Secure Your Assets?
Ensure seamless communication between your device and the blockchain.
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