Trezor Bridge is the essential software component that acts as a secure and reliable messenger between your Trezor Hardware Wallet and applications like Trezor Suite, or browser‑based services. When your browser cannot directly access USB devices (due to security restrictions), Bridge provides the needed layer of communication. If you're following the setup procedure via Trezor.io/start, you’ll be guided to install it when required.
Bridge does not manage your funds or private keys — those remain firmly on the hardware wallet. Instead, it simply translates USB or WebUSB requests from browser or Suite to your device and returns approved responses when you confirm actions directly on your Trezor device.
Because browsers often restrict direct USB access, malicious scripts or rogue web pages cannot directly reach your device. Trezor Bridge runs locally and requires your explicit confirmation via the hardware device for any sensitive operation. Thus critical actions like transaction signing always require physical approval.
Whether you use Windows, macOS, or Linux, and whether your browser supports WebUSB or not, installing Bridge ensures your setup works smoothly. If your combination of browser + OS lacks WebUSB support, Bridge bridges that gap so you can still use Trezor Suite web interface or other compatible services without obstacles.
When you use the desktop version of the Suite app, often Bridge is built‑in or auto‑detected. But for web‑based interfaces, Bridge ensures Suite and other apps can detect your device reliably. This helps avoid errors like "Device not found" which are common when trying to use web apps without Bridge installed correctly.
The wizard on Trezor.io/start detects whether your system needs Bridge. It guides you through installing it only when necessary. Users who follow this flow avoid many common pitfalls.
Visit Trezor.io/start → Official Downloads → Trezor Bridge. Choose the version matching your OS (Windows, macOS, Linux). Always verify signatures or checksums if available.
Run the installer. On macOS, you may need to allow the app under Security & Privacy settings. On Linux, use the package manager or repository version. Windows may prompt a UAC notice — accept it to install Bridge as a background service.
Plug in your Trezor Hardware Wallet. Open Trezor Suite or a supported web app. If Browser shows "connect device", Bridge should enable the hardware wallet to appear. Confirm on the device using PIN as prompted.
Bridge will occasionally require updates. The Suite or browser‑interface will notify you. Install updates from official sources. Older versions may have bugs or compatibility issues.
If your device is not detected, try changing USB cables, using different ports, closing browser then reopening, or restarting your computer. Also ensure Bridge is running (check system tray / background services).
Trezor device firmware and Trezor Bridge software both receive updates to improve security. When using Trezor Suite, always accept verified firmware updates. Outdated firmware or Bridge versions can be potential vectors for vulnerability.
When you send transactions or approve addresses, always verify the display on your Trezor device itself. Even if the browser shows something, the final confirmation must come from your hardware wallet for true security.
Download only from Trezor.io/start or official Trezor sites. Never trust links from random messages. Malicious copies of Bridge or Suite may mimic layout but are dangerous.