Trezor Bridge is a slim, local communication agent that enables your web browser and desktop applications to talk securely with a Trezor hardware wallet. It runs on macOS, Windows and Linux and abstracts away direct USB/HID complexities so web apps like Trezor Suite or browser-based wallets can interact with your device through a consistent, secure channel.
Without Bridge you would either need browser native support for HID or fall back to legacy integrations. Bridge ensures compatibility, a stable API surface and improves security by restricting direct access to the device and by using origin-aware policies.
The agent runs locally and exposes a small HTTP-like API on 127.0.0.1 so trusted web origins can communicate with the wallet. The agent also handles firmware update flows and transports requests.
Modern browsers connect to Bridge through a handshake. Bridge enforces origin validation (which web page is requesting access) and prompts users to confirm device actions on-screen and on the hardware device.
Trezor Bridge uses HID/USB transport under the hood — however its API shields developers from low-level operations such as device enumeration, endpoint management and raw control transfers.
Always download Bridge from official channels, keep your device firmware up to date, and never approve operations you do not recognize on the device display.
Install Bridge from the official Trezor website and follow the quick installer. On first connection Bridge registers itself as an accessible local service for supported browsers.
If your browser can't find Bridge, try restarting the Bridge service, reconnecting your device, or opening the official trezor.io/start troubleshooting steps linked above.
1) Plug in your Trezor. 2) Open a supported web app. 3) When prompted, allow the page to connect to Bridge. 4) Confirm the request on your device. Successful authentication establishes a session for that origin only.
Bridge helps deliver firmware updates by streaming update files to the device and ensuring integrity checks are performed before flashing. Always use official firmware delivered through the Trezor channels.
Developers can use the official trezor-connect library which communicates with Bridge. The library handles pairing, JSON-RPC style requests and response parsing so you can focus on UX while the library enforces safe defaults.
Bridge intentionally keeps UX minimal — prompts are displayed in the web app and on the device. For accessibility, web clients should provide clear instructions and fallbacks if Bridge isn't available, including downloadable desktop Suite alternatives.
Trezor Bridge is a focused connectivity layer that prioritizes security, compatibility and ease of integration. Whether you are an end user or a developer building wallet integrations, understanding Bridge's role makes connecting to a hardware wallet more predictable and safer.
Install the latest Bridge package, try Trezor Suite, and review the developer libraries if you plan to integrate Trezor support into your application.