Trezor Bridge is a lightweight, secure communication application that connects your Trezor hardware wallet to desktop browsers and apps. It acts as the trusted messenger between the device and host software, ensuring that transaction data, confirmations, and firmware operations remain confidential and verifiable.
Why Trezor Bridge exists
Trezor hardware wallets are built to isolate private keys from internet-exposed devices. To interface safely with desktop environments, a minimal, secure, and auditable bridge is necessary. Trezor Bridge fills that role by providing:
- Reliable USB communication across browsers and operating systems.
- Minimal attack surface — Bridge only exposes what is required to interact with the device.
- Automatic updates and cryptographic signing for integrity.
How it works (high level)
When you connect a Trezor device, the browser talks to a local Bridge service using secure endpoints. The Bridge forwards requests to the device over USB and returns signed responses or prompts back to the host application. Crucially, all signing operations occur on the device itself; Bridge only transports messages.
Security model
Trezor Bridge follows a least-privilege design. It enforces access control to attached devices, uses code signing for releases, and isolates network access so that signing operations cannot be exfiltrated through the Bridge.
Key safeguards
- Signed installers and binaries
- Minimal local API surface
- No private keys stored outside the device
- Transparent release notes and auditability
Best practices for users
To keep your Trezor ecosystem secure:
- Install Bridge only from official sources.
- Keep Bridge and Trezor firmware updated.
- Verify installer signatures where offered.
- Use official wallet software (e.g., Trezor Suite) for critical operations.
Troubleshooting common issues
If Bridge is not connecting:
- Confirm the device is unlocked and screen prompts accepted.
- Restart the Bridge service or reinstall from the official page.
- Check OS permissions for USB access and browser flags that block local connections.
Governance, transparency & updates
Trezor publishes Bridge releases with changelogs and security notes. The project encourages community review and provides official channels for reporting vulnerabilities and receiving support.
Where to learn more
Below are curated official resources to download, verify, and learn about Trezor Bridge and related tooling.