The missing link between your browser and your Trezor
Trezor Bridge is a compact, secure helper application that runs on your computer and enables modern web browsers to detect and communicate with your Trezor hardware wallet. Because browsers restrict direct access to USB devices for security reasons, Bridge provides a controlled, authenticated channel so that the official web applications can request and receive cryptographic operations from your device — while ensuring your private keys never leave the hardware.
How Bridge works (in plain language)
When you open the official Trezor web interface, the site needs to send commands to the hardware (request public keys, ask for signatures, etc.). Bridge runs locally and listens for these requests from the web page only if they originate from trusted Trezor domains. It translates those browser requests into the USB protocol your device understands, forwards them securely, and returns signed responses. The hardware insists on on-device confirmations — everything that matters cryptographically is performed on the Trezor device screen and buttons.
Core security principles
Why you should (and shouldn't) trust Bridge
You should trust Bridge when you obtain it from official sources and verify installers where available. It is designed so that even if an attacker controlled your browser, they cannot extract private keys — because private keys never leave the Trezor device. However, always treat local software with caution: keep your OS updated, install only signed installers, and verify checksums if provided.
Installation & quick start
Download the official installer for your platform and run it. After Bridge is running, visit the Trezor Start page to initialize or unlock your device:
- Download Bridge: https://trezor.io/bridge
- Official start page: https://trezor.io/start
- Firmware & updates: https://trezor.io/firmware
Common troubleshooting
If your browser doesn't see the device: ensure Bridge is running; try a different USB cable or port; restart your browser and Bridge; check for updates. Official support guides and articles can help diagnose platform-specific issues.
Privacy & network behaviour
Bridge is local-only: it does not upload your seed or private keys. Network calls you see during wallet interactions usually come from the web interface (for example when fetching current balances or broadcasting transactions) and may contact block explorers or backend services. To limit exposure, use privacy-preserving backends or run your own node when possible.
Advanced & developer guidance
Developers can integrate Trezor support into web apps using the official libraries and SDKs. Detailed docs and protocol descriptions are available for contributors and integrators.
// Minimal detection example
if (window.TrezorConnect) {
TrezorConnect.getFeatures().then(f => console.log('Device features:', f));
}
Developer resources: GitHub · Learning center
Compatibility and integrations
Bridge works with many wallets and integrations that support Trezor devices. For a compatibility overview, check the official list and third-party integrations that follow recommended security practices.
Compatibility: https://trezor.io/compatibility
When to update or reinstall Bridge
Install updates when the official site or support announces them, especially when they include security fixes. If you experience persistent detection issues, reinstalling from the official bridge page can often resolve corrupted installs.
Best practices checklist
- Always download Bridge from the official page. Bridge download
- Verify installer signatures or checksums when provided.
- Keep device firmware and Bridge up to date. Firmware
- Prefer official web UIs or vetted third-party integrations.
- Use strong physical security for your device and seed backup.
For official purchases and to avoid counterfeit hardware, use the official store: Trezor Shop.