Overview
Trezor Bridge is a small communication daemon developed by SatoshiLabs that historically let web pages talk to your Trezor hardware wallet through USB. It acted as a secure intermediate layer so legacy browsers and web apps could access the wallet’s APIs without relying on experimental browser features. For many years Bridge enabled reliable connections between devices, web wallets, and desktop apps.
Why Bridge existed
Browsers limit direct USB access for security and compatibility reasons. Bridge provided a consistent, signed, and maintainable host-side program that exposes a local endpoint for the Trezor Suite web interface and older integrations. It handled device detection, protocol negotiation, and ensured the host machine and the device could exchange protobuf messages safely.
Important change — deprecation
Trezor’s product team has deprecated the standalone Trezor Bridge and shifted users toward the modern Trezor Suite (desktop or web) and native WebUSB/WebHID flows where supported. If you rely on old Bridge installers, remove them and prefer the latest Suite for ongoing compatibility and security — this is the recommended path going forward.
Installing or removing Bridge (short)
If you still need Bridge: download only from official hosts, verify signatures when available, and follow OS-specific instructions. If you migrate to Trezor Suite, the desktop app bundles modern connectivity and usually removes the need for separate Bridge installs. For troubleshooting, check firewall/antivirus settings, try different USB ports/cables, and consult official support channels.
Security & best practices
Always download software from official sources and verify signatures. Physical confirmation on the Trezor device is required for sensitive operations (PIN entry, transaction signing), so an attacker would generally need physical access to bypass that layer. Report vulnerabilities via Trezor’s security channels and follow official advisories for updates.
Quick recommendation
For most users today: use Trezor Suite (desktop) or the Suite web app with WebUSB if you’re on Chrome. Only use the standalone Bridge when a legacy integration absolutely requires it, and prefer official downloads and verification checks.