A lightweight, secure bridge between your Trezor hardware and the web — designed to make signing, transaction previewing, and device communication reliable and transparent.
Official companion tool · Trezor ecosystem
Why Trezor Bridge matters
Trezor Bridge is the trusted intermediary that allows the Trezor hardware wallet to communicate with web applications and desktop clients in a controlled, secure way. Its purpose is simple but essential: provide a stable communication layer that respects the device's hardware isolation while giving developers a predictable API to integrate. That means when you sign a Bitcoin transaction in your browser, the Bridge ensures the payload reaches your device intact, and that the signed result returns to the app without revealing your private key to the browser or a third party.
In practice the Bridge removes a lot of friction. Browser security models evolve and can break direct USB access; the Bridge sits between those changes and your hardware, offering a consistent experience across operating systems and browser versions. For users, that translates to fewer connection headaches, clearer signing prompts, and a smoother workflow when interacting with exchanges, custodial-free services, or DeFi apps that respect hardware-backed security.
Stable device communication
Bridge abstracts hardware quirks and provides a reliable transport for command-and-response messaging. It reduces the chance of spurious errors caused by drivers or browser changes.
Cross-platform support
Available for Windows, macOS, and Linux, Bridge helps maintain consistent behavior across environments so users don't have to chase platform-specific fixes.
Developer-friendly
Developers can target a stable API and focus on UX rather than low-level USB handling. This encourages more secure integrations and better end-user experiences.
Minimal footprint
Bridge is intentionally lightweight and does not ship with unnecessary extras — it's a focused service for device-human interaction.
Security model — what Bridge does and intentionally does not do
Security is nuanced: Bridge's goal is to be a trusted courier, not a vault. It must never handle private keys, seed phrases, or any sensitive cryptographic secrets. Those remain isolated inside the Trezor hardware. Bridge simply relays formatted requests and responses between host applications and the device. It performs minimal parsing to ensure messages are well-formed and to reduce the chance of malformed payloads causing undefined device states.
Because Bridge runs locally, it reduces exposure to remote attackers; there is no remote API that transmits your signing requests over the internet by default. Developers and power users should still adopt defense-in-depth: verify application authenticity, review transaction data on the device display, and keep Bridge up to date to receive patches for any discovered vulnerabilities.
Best practices
Download Bridge only from official channels and verify file integrity.
Always confirm transaction details on the device screen before approving.
Keep your OS and browser updated, and limit unnecessary browser extensions that may interact with web3 pages.
Use Bridge in a secure user profile or machine when dealing with large-value transactions.
Install & quick setup
Installing Bridge is straightforward: download the package for your platform, run the installer, and follow on-screen prompts. After installation, Bridge runs as a background service and exposes a local API that authorized web applications can call. Many web apps detect Bridge automatically; others may prompt you to enable it. If a web app cannot detect your device, verify Bridge is running and that your browser session is allowed to use it.
Common steps
Download the Bridge installer for Windows, macOS, or Linux from the official site.
Run the installer and follow the prompts. On some systems you may need admin privileges to install a background service.
Open a web app that supports Trezor and connect your device. When prompted, allow the app to talk to Bridge.
Follow signing prompts carefully — the device screen shows exactly what you are approving.
Troubleshooting
Connection issues can be frustrating. Start with the basics: ensure Bridge is running, try a different USB cable or port, restart your browser, and check that your OS recognizes the device. On some platforms, permission dialogs may block access — inspect your system security preferences. If problems persist, consult the official troubleshooting guide or community support channels; many issues have quick, documented fixes.
When to ask for help
Bridge installation fails repeatedly or reports corrupted files.
Device behaves inconsistently across apps (works in one but not another).
You observe unexpected prompts asking for secrets — never share your seed.
Downloads & updates
Keep Bridge updated. Official updates can include critical security fixes or compatibility improvements with new browser releases. The app usually checks for updates automatically, but you can also manually download the latest version from the official site and verify signatures when available. If you manage multiple machines, centrally tracking versions helps avoid inconsistent behaviors when switching between systems.
Release notes & changelogs
Before updating on a production machine, review release notes for behavioral changes. Bridge updates rarely change signing semantics, but being aware of compatibility notes reduces surprises.
Working Key — safe demo (clearly placeholder)
Below is a harmless simulated key display demonstrating how Bridge-enabled apps might show a derived public key or masked identifier. This is intentionally inert and not usable for transactions. It exists to show how user interface patterns — masking by default, explicit reveal actions, and copy-to-clipboard feedback — help users avoid accidental exposure of sensitive strings in casual workflows.