Trezor Bridge serves as a controlled communication layer between host applications (web interfaces or desktop wallets) and the Trezor hardware wallet. Rather than giving web pages or apps raw USB access to the device, Bridge exposes a constrained API that forwards structured requests. The device itself remains the authority for any sensitive operation: it verifies transaction details on its secure screen and produces cryptographic signatures inside the hardware. This separation keeps private keys offline and significantly reduces the attack surface presented by a compromised host.
How Bridge protects your keys
When you create a transaction or sign a message, your browser constructs a request that Bridge relays to the Trezor device. The hardware displays the relevant details — such as amounts, recipient addresses, and any critical metadata — and requires you to confirm via physical buttons or touch. Signing occurs inside the device, so the private keys never touch the host computer. Even if the computer is compromised by malware, it cannot produce valid signatures without your explicit on-device approval.
Private keys remain sealed in the hardware; Bridge only forwards requests and responses.
All signing actions require manual confirmation on the device to prevent silent approvals.
Bridge works with major desktop platforms and integrates with Trezor Suite and many third-party wallets for a smooth user experience.
Installation & maintenance
Download Bridge only from official Trezor channels. Installers are provided for Windows, macOS, and Linux and typically set Bridge to run as a background service. After installation, supported browser wallets and desktop apps should detect the device automatically. Keep Bridge and device firmware updated — updates include security patches, bug fixes, and compatibility improvements, so installing them promptly is a recommended practice.
Best practices
- Download official builds: Avoid third-party mirrors or community builds that may be tampered with.
- Confirm on-device: Always verify the address and amount shown on the device before approving transactions.
- Use trusted hosts: Prefer your personal computer over public or shared machines for managing funds.
- Secure backups: Keep your recovery seed offline, in a physically secure location; Bridge does not handle backups.
- Stay updated: Regularly update Bridge, your wallet apps, and device firmware.
Troubleshooting quick steps
If a browser doesn't detect your device: first ensure Bridge is installed and the service is running. Try a new USB cable or a different port, unlock the device, and reload the page. Browser extensions, strict privacy settings, or alternative USB drivers can interfere — try a different browser or temporarily disable extensions. Restarting the Bridge service or rebooting the machine often resolves transient issues. If problems persist, verify firmware compatibility and consult official support resources for deeper diagnostics.