Made with GrigoraOfficial Hardware Interface Protocol
Trezor Bridge is a lightweight, background communication daemon engineered specifically to bridge the communication gap between your physical Trezor hardware wallet and modern internet browsers. Originally introduced to eliminate reliance on depreciated browser plugins and extension APIs, the Bridge operates entirely in local background memory. It establishes an encrypted, bidirectional USB communication pipeline, ensuring private keys never leave the secure enclave of the hardware wallet while authorizing legitimate web3 and Trezor Suite transactions.
Dedicated Localhost Socket
Immune to Extension Hijacks
Windows, macOS & Linux
Publicly Audited Cryptography
Decentralized finance (DeFi), NFT marketplaces, and Web3 decentralized applications require immediate, programmatic interaction with hardware keys to verify cryptographic signatures. In earlier iterations of the web, NPAPI and Chrome apps handled raw hardware access. When browsers phased out external plugins to mitigate cross-site attack vectors, Trezor developed Trezor Bridge to act as an unprivileged, sandboxed localhost daemon.
By hosting an internal server accessible solely through origin-verified localhost queries on port 21325, Trezor Bridge bypasses browser security restrictions without weakening your operating system's integrity. It ensures that neither rogue extensions nor malicious browser scripts can spoof USB hardware events or inject unverified payloads directly into the device.
• Service Runtime: trezord (C++ / Go background process)
• Supported Devices: Trezor Model One, Trezor Model T, Safe 3, Safe 5
• Communication Layer: HTTP / CORS localhost (127.0.0.1:21325)
• Native Drivers: WinUSB (Windows), LibUSB / udev rules (Linux), IOKit (macOS)
Engineered with defensive cryptographic boundaries to guard against modern vector intrusions.
Trezor Bridge transfers purely serialized protobuf messages. Your recovery seed phrase, private keys, and PIN codes never traverse into the computer memory or OS cache.
The daemon strictly regulates Cross-Origin Resource Sharing. Only approved and authenticated origin requests (such as Trezor Suite web interface) are granted handshakes with the daemon.
For modern Chromium installations, Trezor seamlessly complements the Bridge with WebUSB capabilities, ensuring fail-safe continuity if background system permissions are temporarily gated.
Download the verified installer for your operating system (available in .exe for Windows, .pkg for macOS, and .deb/.rpm for Linux distributions). Always verify hash signatures prior to package execution.
Run the installer with standard administrative privileges. On Linux, ensure appropriate udev rules are automatically written or manually placed under /etc/udev/rules.d/51-trezor.rules to permit non-root access.
Plug your Trezor Model T, Safe 3, or Model One device directly into your computer using an original, data-capable USB cable (avoid unpowered USB hubs or signal-degrading splitters).
Launch your preferred web browser and navigate to the Trezor Suite web console. The application will instantly detect the running Bridge instance and initiate device handshaking automatically.
You can confirm daemon functionality at any time by pointing your web browser to http://127.0.0.1:21325/status/. If Trezor Bridge is running smoothly in your background processes, the page will return a clear confirmation showing the running version number and active USB polling status without loading external assets.
First, verify that conflicting wallet software or competing browser extensions (such as MetaMask or other Web3 injectors) are not monopolizing the USB endpoint. Next, restart the trezord process via your system Task Manager or Activity Monitor, and ensure your anti-virus suite does not flag localhost communication on loopback port 21325.