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What is Trezor Bridge?

Trezor Bridge is a small background application (or WebUSB interface) that safely relays messages between browsers or local apps and your Trezor hardware wallet. It abstracts USB, HID, and WebUSB transport details so integrations can focus on secure signing, account management, and transaction workflows. Trezor Bridge ensures messages are delivered reliably, maintains a secure session, and prevents unsolicited device access.

Trezor Bridge

WebUSB

Secure Gateway

Hardware Wallet

Device Connectivity

Why use Bridge & WebUSB?

Bridge provides a consistent, secure connection that works across browsers and desktop environments. Where WebUSB is supported, browser apps can talk directly to the device with minimal user friction. Bridge acts as the reliable fallback for broader compatibility and for operating systems that limit direct USB access. Both approaches keep your private keys safe by ensuring all signing prompts appear on the physical device.

Key benefits

Security-first transport: encrypted channels, origin checks, and explicit user approvals prevent unauthorized access.
Cross-platform support: works on Windows, macOS, and Linux; WebUSB where available.
Developer-friendly APIs: a stable transport for SDKs, browser wallet integrations, and exchange connections.
Reliable device enumeration: consistent device discovery, reconnection handling, and error recovery.

Developer quickstart

// Minimal example: connect via Trezor Bridge
import TrezorConnect from 'trezor-connect';
await TrezorConnect.init({connectSrc: 'https://connect.trezor.io/'});
const res = await TrezorConnect.getPublicKey({path: "m/44'/0'/0'"});
console.log(res);

This example uses the TrezorConnect library which transparently uses WebUSB or Bridge depending on the environment. Always check for user permission and show clear UI prompts before initiating any device action.

Security & privacy considerations

Trezor Bridge was built with security in mind: transport-level encryption, strict origin checks, and session management reduce attack surface. Bridge does not access your private keys or recovery seeds — signing operations happen exclusively on the Trezor device. Additionally, Bridge logs are minimal and never contain sensitive key material. Integrators should always request the minimal permissions necessary and surface device prompts to the end user clearly.

Best practices

Keep Bridge and device firmware up-to-date by enabling automatic updates or notifying users of new releases.
Validate the origin/domain of wallet requests before forwarding to the device.
Implement explicit user confirmations in the UI for every signing request.
Use testnets and sandbox endpoints during development to avoid accidental mainnet transactions.

Installation & compatibility

Download Trezor Bridge installers for Windows, macOS, and Linux from the official site. For modern browsers that support WebUSB, no Bridge installation may be required; the browser can talk directly to the device after explicit user permission. Always link users to the official downloads page and include checksums and signing information so users can verify the installer authenticity.

Troubleshooting

If a device is not detected, ensure Bridge is running or that the browser supports WebUSB.
On Windows, check USB drivers and permissions; restart the Bridge service if necessary.
Refer to the compatibility matrix for device models and firmware versions.

FAQs

Q: Do I need Trezor Bridge to use my Trezor device?
A: Not always — modern browsers with WebUSB support can talk directly to the device. Bridge provides broader compatibility and is the recommended fallback for desktop environments.
Q: Is Trezor Bridge safe to install?
A: Yes — Bridge is a minimal, signed application that only relays encrypted messages between your apps and device. Install from the official Trezor site and verify signatures if you want extra assurance.
Q: What data does Bridge collect?
A: Bridge collects minimal diagnostics for connection reliability but never receives private keys, seeds, or unencrypted transaction data.
Q: How does WebUSB differ from Bridge?
A: WebUSB allows browsers to communicate directly with USB devices. Bridge is a local background app that provides a consistent API across environments and works when WebUSB is not available.
Q: Where can developers find SDKs and docs?
A: Official SDKs, code samples, and API docs are available on the Trezor developer portal and GitHub repositories maintained by the Trezor team and community.