Web standards and security policies change rapidly. Browsers restrict direct native USB access for security reasons; Bridge provides an official, maintained channel that avoids fragile heuristics and keeps the device accessible to the user while staying compliant with browser policies.

Without Bridge, users faced inconsistent experiences across Chrome, Firefox, Edge, and platforms like Linux, macOS, and Windows. Bridge unifies the interface.

Trezor Bridge runs a local server (loopback). The Wallet application or web UI connects to Bridge via secure, authenticated requests. Bridge then relays commands to the Trezor device over USB. The connection uses strict origin checks and user confirmations on the device to prevent unauthorized access.

This design keeps cryptographic secrets isolated on the hardware device, while the Bridge handles only transport-level concerns.

Trezor Bridge defends against local malware trying to talk to a wallet without permission, network attackers, and browser-origin spoofing. The device itself remains the ultimate root of trust — private keys never leave it. Bridge authenticates connections, enforces policies, and logs only minimal metadata.

Users must still follow best practices: keep Bridge up to date, verify firmware, and confirm transactions on the device screen.

Bridge installers are provided for Windows, macOS, and Linux. Installers set up the local service and register it with the OS. Updates are regular — they add device support, security fixes, and performance improvements. Always download Bridge from official sources and verify download integrity where offered.

Tip: Automate updates where allowed to stay protected.

Typical problems include driver conflicts, firewall blocking the local service, or stale browser caches. Fixes: restart Bridge, allow the service through firewall, reinstall drivers, clear browser site data, and reboot the machine. For persistent issues, consult the official Trezor support pages with logs.

Advise: Collect logs before contacting support to speed resolution.

Bridge minimizes data collection. It is not a cloud service — it runs locally. It does not transmit private keys or transaction details to remote servers. Logs are primarily diagnostic and can be shared with support only when a user chooses to do so.

Encourage users to review privacy notices in the Bridge documentation if they have regulatory or corporate compliance questions.

Developers building wallet integrations should use the official Bridge protocol libraries and follow origin/CSRF protections. Testing against different OS/browser combos is recommended. Handle error codes gracefully and instruct users when device confirmation is required.

Best practice: degrade gracefully if Bridge is not present — guide users to install it.

Bridge will evolve as browsers change and as new Trezor devices appear. Security and stability are continuous goals: frequent audits, responsible disclosure programs, and open-source components help maintain trust. Organizations should include Bridge in their device lifecycle plans.

Encourage periodic reviews of installed security software and firmware.