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Official Hardware Connectivity Protocol
Trezor Bridge is the dedicated, lightweight communication background tool designed to facilitate direct, encrypted interaction between your physical Trezor hardware wallet and modern web browsers. By establishing an ultra-secure local channel without reliance on outdated browser extensions, it ensures seamless cryptocurrency management, transaction signing, and uncompromising private key security.
Replaces legacy extensions with a hardened daemon running locally on your machine, preventing unauthorized third-party tampering.
Seamlessly runs in the background across Windows, macOS, and Linux, connecting to Chrome, Firefox, Brave, and Edge.
Consumes negligible CPU and memory resources, awakening only when an authorized cryptographic payload demands USB transfer.
In early cryptocurrency hardware history, external devices relied heavily on browser plugins and extensions to connect USB ports to web applications. However, modern browser architectures phased out NPAPI plugins and restricted raw USB communication to reduce vulnerabilities. Trezor Bridge was engineered by SatoshiLabs to bridge this gap safely. Operating as an independent, locally managed system daemon, Trezor Bridge creates a standardized HTTP interface that functions strictly inside your operating system.
Crucially, Trezor Bridge never holds, interprets, or exposes your private keys or seed phrase. Private keys remain strictly isolated within the secure hardware chip of your Trezor Model One, Model T, or Trezor Safe 3. The Bridge simply acts as an encrypted transport pipe, transmitting serialized transaction packets to the device for physical button confirmation and returning the cryptographically signed response back to the authorized web service.
Trezor Bridge binds exclusively to the local loopback address (127.0.0.1) on port 21325. External machines across your local network or the internet cannot discover or send payloads to your physical device. It rejects unauthorized CORS queries, ensuring that malicious scripts residing on untrusted websites cannot probe your hardware or intercept ongoing signing requests.
Privacy is foundational to decentralized finance. Trezor Bridge operates in full transparency under an open-source license. It stores no activity logs, keeps no cache of wallet addresses, collects zero analytical cookies, and transmits no analytics back to central servers. Your on-chain balances and transaction history remain completely confidential at all times.
Deploying Trezor Bridge takes under two minutes. Follow these standard guidelines to set up your environment securely.
Obtain the installation package strictly through verified SatoshiLabs releases. Always cross-check the binary digital signature and SHA256 checksum to ensure tamper-proof authenticity before running the executable.
Execute the installer on your operating system (macOS PKG, Windows MSI/EXE, or Linux DEB/RPM). The setup registers Trezor Bridge as a managed local daemon, configured to launch smoothly on system startup.
Connect your physical hardware wallet using a reliable USB data cable. Open Trezor Suite Web or your chosen Web3 dApp; the interface will automatically detect the Bridge and initialize your session seamlessly.
First, verify whether the trezord service process is running via Task Manager (Windows) or Activity Monitor (macOS). If inactive, manually launch the application. Additionally, check that aggressive ad blockers, anti-fingerprinting shields, or custom VPN loopback blockers are not filtering internal requests directed toward localhost at port 21325. Refreshing the browser or clearing the connection cache often resolves immediate session conflicts.
No. The standalone Trezor Suite desktop application comes bundled with native USB drivers embedded directly into its binary package. You only need Trezor Bridge when you choose to manage assets through browser-based interfaces such as Trezor Suite Web, decentralized exchanges (DEXs), or third-party web wallet integrations that do not utilize native WebUSB.
No. The security architecture enforces that all sensitive operations—such as approving destination addresses, verifying gas limits, and exporting public keys—require explicit, tactile confirmation on the physical screen and buttons of your Trezor device. Even if an attacker were to manipulate the web page, the device screen independently displays true transaction details before any signature occurs.
Neither Trezor Bridge, Trezor Suite, nor SatoshiLabs support will ever prompt you to input your 12, 18, or 24-word recovery seed into a website, browser popup, or computer keyboard. Your recovery seed belongs solely on paper or metal backups. Enter seed words exclusively into the physical hardware device during recovery mode.
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