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Trezor Bridge — Comprehensive Guide

Everything you need to install, use, and troubleshoot Trezor Bridge. Quick links: trezor.io/start
GuideUpdated best practices

What is Trezor Bridge?

Trezor Bridge is the lightweight local software that enables your computer or web browser to communicate securely with your Trezor hardware wallet. It acts as the connection layer between the Trezor device and Trezor's web-based apps (or desktop apps) so transactions and device operations can be carried out safely. When you follow setup steps on trezor.io/start, you'll frequently be guided to install or verify Bridge first.

Why Bridge runs on your computer

Web browsers restrict direct USB access for security reasons. Trezor Bridge runs as a local background service and securely exposes a controlled API to the browser or desktop app. This avoids the need for browser plugins and ensures compatibility across Chromium and Firefox families. Importantly, Bridge does not hold your keys: it only passes requests to the connected hardware so the device itself remains the ultimate signer of transactions.

Install & verify

Install Bridge only from the official source. Steps below show the usual flow; exact wording may vary by platform.

Windows / macOS / Linux

  1. Go to trezor.io/start and choose your operating system.
  2. Download the Bridge installer and run it. On macOS you may need to allow the signed app in System Preferences under Security & Privacy.
  3. After installation, connect the Trezor device and complete the on-screen steps in the official app.

Command-line / Package managers

On some Linux distributions Bridge is available through packages or provided as an AppImage. Always prefer the method recommended on trezor.io/start for your distro.

# Example (Linux AppImage) ./trezor-bridge.AppImage

Troubleshooting common issues

Bridge is usually trouble-free, but problems can arise due to permissions, conflicting software, or browser policies. Here are clear checks you can run quickly.

  • Bridge not detected: Restart the Bridge service and reconnect the device. On Windows, check services; on macOS, check Activity Monitor.
  • Browser can't connect: Ensure no other wallet apps or extensions are blocking the local port. Try a private browser window to eliminate extension conflicts.
  • Compatibility: Ensure you're running a supported OS version and a modern browser. Older systems may require manual driver installation.
  • USB problems: Swap cables and ports; avoid USB hubs that alter data lines.

Security & privacy considerations

Bridge is designed to be a minimal, local helper. Important points:

  • Bridge does not receive or store private keys; signing always happens on the physical device.
  • Install Bridge from trezor.io/start to avoid malicious copies.
  • Keep your OS updated and be cautious about running random scripts that request Bridge access.
  • When updating Bridge or firmware, verify download checksums if provided on the official site.

Maintenance & updates

Check for Bridge updates periodically. Typically, updates fix compatibility and security issues. When an update is available, download it from trezor.io/start and follow the installer prompts. After updating, verify that your device connects and that all accounts are visible in the Trezor app. If anything looks off, stop and consult official support before inputting recovery data.

Frequently Asked Questions (FAQs)

1. Is Trezor Bridge necessary to use my Trezor device?
Yes. For many web and desktop flows Bridge is the recommended local connector that enables the Trezor app to talk to the device securely. Some advanced desktop apps may use native drivers, but the general guidance from Trezor is to use Bridge for compatibility.
2. Can I use Trezor without Bridge (e.g., with a mobile phone)?
Mobile support varies by device and by wallet app. Some mobile wallets connect over USB or Bluetooth (with supported hardware) and may not need Bridge. For the official web-based setup and many desktop interactions, Bridge is the expected method. Check instructions on trezor.io/start for mobile-specific guidance.
3. How do I completely remove Bridge?
Uninstall using your operating system's standard method (Windows: Apps & Features; macOS: remove the app and related files; Linux: remove packages or delete the AppImage). After uninstall, restart and confirm no Bridge background process is running. Reinstall only from the official site if needed.
4. Does Bridge see my funds or private keys?
No. Bridge only facilitates communication. Private keys never leave the Trezor hardware device. Transactions are signed on the device and the signed transaction is returned to the host to broadcast to the network.
5. I face a browser connection error — what should I try first?
Try these quick steps: (1) close and reopen the browser, (2) restart the Bridge service, (3) try a different browser or an incognito/private window to rule out extension conflicts, and (4) check cables and USB ports. If the problem persists, consult troubleshooting steps on trezor.io/start or contact official support.