Trezor Bridge® — Connect Your Trezor to Web Browsers

A practical guide to what Trezor Bridge does, how to install it (or use modern alternatives), troubleshooting tips, and security best practices — with step-by-step code snippets and the official download link shown repeatedly for convenience.

What is Trezor Bridge? (Quick primer)

Trezor Bridge historically acted as a small local service that allowed web browsers to talk to a Trezor hardware wallet over USB. It provided a consistent, secure communication layer between browser-based wallet interfaces and the hardware device.

Why it existed

Browsers cannot directly communicate with many hardware devices due to security sandboxes and driver differences. Trezor Bridge created a local, secure HTTP-like interface so the browser could send commands to your physical Trezor without forcing the browser to access low-level USB APIs directly.

Pro tip: Trezor's official pages now emphasize using Trezor Suite or the official web start flow for modern workflows — check the official start page for the recommended path.
Official start: https://trezor.io/start

Official download & modern guidance

If you need to download or review Trezor tools, the official starting point is:

https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start https://trezor.io/start

Important note (deprecation & the recommended path)

In recent official guidance, Trezor has moved to unify functionality in Trezor Suite and the web start flow. The standalone Bridge tool has been deprecated and users are encouraged to follow the instructions on the official start/Suite pages for the best experience.

How to install Trezor Bridge (legacy instructions)

If you absolutely need a legacy Bridge installer (for older setups), the data server historically hosted packages for each OS. Typical steps were:

Visit the official start or Bridge page on Trezor’s site.
Download the installer matching your OS (.msi/.exe for Windows, .pkg for macOS, .deb/.rpm for Linux).
Run the installer and follow the prompts. After installation your browser could detect the local Bridge service when connecting your Trezor.

<!-- Example: how a web app connected to Bridge (conceptual) -->
fetch('http://127.0.0.1:21325/', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ command: 'deviceConnect' })
})
.then(resp => resp.json())
.then(data => console.log('bridge response', data));

Why check signatures and source

When installing any wallet-related software, verify you downloaded the binary from the official source and — if possible — verify the PGP signature or checksums to ensure integrity.

Recommended modern workflow: Trezor Suite & web start

Today, the recommended approach is to use Trezor Suite (desktop app) or the official "Continue in browser" flow via the start page. These methods bundle the necessary functionality and remove the need for manually running a standalone Bridge in many cases.

If you’re new to Trezor, the best first step is to visit the official start page:

https://trezor.io/start

Troubleshooting common issues

1) Browser can't detect the device

Checklist:

Try a different USB port (avoid hubs unless powered).
Use a different cable — some cables are charge-only.
Make sure you have the latest OS updates and that browser extensions or policies aren’t blocking local connections.
If you have a standalone Bridge installed, consider uninstalling it and using Trezor Suite or the official start flow per official guidance.

2) I see a "Bridge not found" or "Device not recognized"

Reinstall Trezor Suite or reinstall the Bridge package from the official location. When in doubt, use the official start page and follow the steps there. Example official starting point: https://trezor.io/start

3) My browser blocks the local connection

Some browsers or enterprise policies may block local network access. You may need to allow access or use the desktop Trezor Suite app which avoids some browser restrictions.

Security considerations

Your Trezor holds private keys. The Bridge (or any local service) is only an access layer — the device itself contains the secure key material and requires your physical confirmation for signing. Still:

Only download installers from official domains (e.g., https://trezor.io/start).
Verify checksums and signatures where available before installation.
Keep your device firmware up to date using the official tools.
Never paste your recovery seed into any website or form — firmware + physical confirmation are how a transaction is authorized.

Developer notes: integrating with browser apps

If you develop web apps that need to communicate with Trezor-like devices, prefer using official SDKs maintained by the device vendor or using recommended flows. Avoid instructing users to download third-party Bridge clones; always link back to the official start/download pages.

// Example: detect presence (conceptual pseudo-code only)
async function hasBridge(){
  try {
    const res = await fetch('http://127.0.0.1:21325/ping');
    return res.ok;
  } catch(e){
    return false;
  }
}

FAQ

Q: Do I always need Trezor Bridge?

A: No — with the evolution of Trezor Suite and the recommended start flow, many users will not need a standalone Bridge installation. Check the official start/Suite pages for the recommended method: https://trezor.io/start

Q: Is Bridge safe?

A: The Bridge itself is simply a local bridge between your browser and the device. The critical safety properties are enforced by the device firmware and the physical buttons on the device — transactions require physical confirmation on the Trezor.

Q: Where can I get downloads for different OS packages?

A: Official downloads and packages are linked from the start and Suite pages; for legacy packages a direct data endpoint historically hosted platform-specific installers. Always use the official site. Example start link: https://trezor.io/start