The Vital Link for Your Digital Security
Trezor Bridge is the essential background application that securely connects your Trezor hardware wallet to your web browser, enabling seamless interaction with the blockchain ecosystem.
Connection Secure
Trezor Bridge is active
✓ trezord.service started
✓ listening on 127.0.0.1:21325
✓ device detected: Model T
➜ ready for commands...What is Trezor Bridge?
Trezor Bridge is a lightweight communication tool designed by SatoshiLabs to facilitate the interaction between your Trezor hardware wallet and modern web browsers. Unlike traditional USB peripherals that might require specific drivers for every application, Trezor Bridge creates a standardized local server.
Historically, browsers used plugins or extensions to communicate with hardware devices. However, as browser security standards evolved (phasing out NPAPI and other technologies), a more robust and independent solution was needed. Trezor Bridge fills this gap by running as a background process on your operating system (Windows, macOS, or Linux).
When you visit a compatible website—such as Trezor Suite for Web, MyEtherWallet, or MetaMask—the site sends requests to the Bridge via a local network call. The Bridge then translates these requests into USB commands that your Trezor device understands, ensuring a seamless and secure flow of data without exposing your private keys to the internet.
Browser Independent
Works with Chrome, Firefox, Brave, and more.
Lightweight
Runs silently in the background with minimal resource usage.
Encrypted
All local communication is strictly verified.
Local Host
Operates entirely on your machine (127.0.0.1).
Why You Need Trezor Bridge
Enhancing your hardware wallet experience with stability and security.
Enhanced Security
By isolating the communication layer from the browser's internal processes, Trezor Bridge reduces the attack surface. It ensures that only authorized domains can communicate with your device, preventing malicious websites from probing your hardware wallet.
Universal Compatibility
Whether you are using the latest Trezor Model T, the Safe 3, or the classic Model One, the Bridge provides a unified driver interface. This means you don't need to install separate drivers for different wallet applications.
Seamless Updates
The Bridge software is designed to be low-maintenance. While it doesn't auto-update to prevent unauthorized changes, it notifies the Trezor Suite interface when a new version is available, ensuring you always have the latest security patches.
Browser Request
Web wallet sends a signal to localhost:21325.
Bridge Verification
Bridge checks if the origin is allowed (whitelist).
USB Communication
Bridge translates signal to USB protocol for Trezor.
User Confirmation
You confirm the action physically on the device.
Under the Hood
At a technical level, Trezor Bridge (process name trezord) acts as a local HTTP server. It listens on port 21325 on your local machine (127.0.0.1). This architecture allows it to bypass the limitations of browser sandboxes that typically prevent direct hardware access.
When you initiate a transaction on a website, the site makes an AJAX call to the local Bridge server. The Bridge then takes over the USB Human Interface Device (HID) or WebUSB protocol to talk to the Trezor. Crucially, the private keys never leave the Trezor device. The Bridge only transports the transaction data to the device for signing and returns the signed transaction back to the browser.
Tech Note: The communication is encrypted via HTTPS, even though it is local, to prevent other local processes from sniffing the data.
Installation Guide
1. Download
Visit the official Trezor website and navigate to the Wallet or Suite section. The site will automatically detect your OS and offer the correct Bridge installer (.exe, .dmg, .deb, or .rpm).
2. Install
Run the installer file. On Windows, you may need to grant administrator permissions. On Linux, ensure you also install the required udev rules for USB permission handling.
3. Refresh
Once installed, the Bridge runs as a background service. You must restart your browser or clear your cache to ensure the web wallet detects the new connection method.
4. Connect
Plug in your Trezor device. The web interface should now show "Device Connected" without asking for additional permissions.
Troubleshooting Common Issues
Device Not Detected
If your device isn't showing up, first try a different USB cable and port. Ensure you are not using a USB hub. If the issue persists, check if the trezord process is running in your Task Manager.
Bridge Connection Error
Sometimes antivirus software or firewalls block the local connection to port 21325. Add an exception for Trezor Bridge in your firewall settings. Also, disable any VPNs temporarily as they might interfere with localhost routing.
Linux Permission Denied
Linux users often forget the udev rules. Without these rules, the OS won't allow the browser/bridge to access the USB device. Download the 51-trezor.rules file from the official GitHub and place it in /etc/udev/rules.d/.
Frequently Asked Questions
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Ensure your connection is stable and secure with the official Trezor Bridge software.
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