Trezor Bridge

Local bridge for secure hardware communication

v1.0 • Updated Oct 2025
Minimal Guide

Trezor Bridge is a tiny local helper that allows your browser or desktop software to talk to a Trezor hardware wallet. It presents a secure, OS-native bridge to avoid complex WebUSB permission flows while keeping signing and key operations strictly on-device.

Key benefits: simple installation • predictable local API • protects private keys by design

Get Bridge

Install & Verify

Installation is simple and quick. Below are concise steps and checks to ensure Bridge runs properly on your machine.

1

Download from official site

Always use trezor.io/bridge. Avoid third-party downloads or attachments.

2

Run installer

On Windows allow the service; on macOS accept helper permissions; on Linux use AppImage or package. Admin permissions may be required.

3

Confirm detection

Open Trezor Suite or your web app and confirm it detects your device. If not, check cables and restart Bridge.

4

Check processes

Run simple process checks to ensure bridge daemon is active (examples below).

Quick terminal checks

# macOS / Linux
ps aux | grep trezord

# Windows (PowerShell)
Get-Process -Name *trezor* -ErrorAction SilentlyContinue

Privacy & Security

Bridge is intentionally local-only. It does not transmit your keys or seed over the internet. However, you should be aware of the following:

  • Local access: Any local app can attempt to communicate with Bridge; always authorize only trusted applications.
  • Browser threats: Malicious pages may try to invoke the Bridge — close suspicious tabs and avoid untrusted sites.
  • Firmware model: Key operations require explicit on-device confirmation — the bridge cannot sign without your approval on the Trezor device.
Why Bridge instead of WebUSB?
WebUSB provides direct browser access but can be unpredictable across browsers and OS. Bridge standardizes communication and reduces permission friction. It is especially useful when browser support for USB is limited.

Developer Notes

Use the official libraries (trezor-connect) which abstract transport layers and provide a safe integration surface. Below is a simple example to fetch address info.

// Example (trezor-connect)
TrezorConnect.getAccountInfo({
  path: "m/44'/0'/0'",
}).then(res => console.log(res));

Tips:

  • Register and provide a manifest if using trezor-connect to avoid rate limits and improve trust.
  • Implement user-friendly flows — always show the user what they will sign and why.
  • Graceful error-handling: detect Bridge absence and prompt clear install instructions.

FAQ & Troubleshooting

Bridge is not detected — what next?
Restart the bridge service, reconnect the device, try a different USB cable, and ensure your browser isn't blocking localhost. Reinstall Bridge as a last resort.
Can Bridge leak my seed?
No. The bridge is a transport; seed and private keys never leave the device. Signing requires explicit on-device confirmation.
Is Bridge required for all Trezor devices?
Not always — some platforms support native USB transports, but Bridge provides a consistent experience across OS and browser combinations.