FusionSync

FusionSyncAI

Instant tunnel

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Your tunnel command

https://warm-condor-8542.tinyfi.sh

ssh -R warm-condor-8542:80:localhost:3000 tinyfi.sh

Free. No login. Paste in Terminal. Tunnel dies when SSH stops.

How to use it

  1. Step 1

    Start your local app

    Run your dev server on localhost (for example port 3000).

  2. Step 2

    Copy the SSH command

    Click Copy command above, paste in Terminal, press Enter.

  3. Step 3

    Share the public link

    Send the preview URL to anyone. Ctrl+C in Terminal when done.

How it works

Your dev server stays on localhost. OpenSSH (already on Mac, Linux, and modern Windows) opens an outbound encrypted tunnel to a free relay. The relay gives you a public HTTPS URL that forwards to your machine while the session is alive.

FusionSync only generates the command in your browser. We do not see your traffic, store your subdomain, or run an API when you use this page.

Good for

  • Quick client or teammate previews before deploy
  • Testing webhooks against a local server
  • Checking mobile layout on a real device
  • Demos from an AI-generated app on your laptop

Not for

  • Production apps, SLAs, or sensitive customer data
  • Permanent URLs (use proper hosting or a named tunnel product)
  • Networks that block outbound SSH
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Instant tunnel FAQ

Is this really free with no account?
Yes on FusionSync: this page is free and needs no login. The tunnel itself runs through a free third-party SSH relay (tinyfi.sh or localhost.run). You only copy a command and run it in Terminal.
When does the tunnel stop working?
When the SSH session ends. Close the terminal, stop the SSH process, or shut down your laptop and the public link dies. Closing this browser tab does not stop an active tunnel in Terminal.
Why can't FusionSync open the tunnel inside the browser?
Browsers cannot accept inbound HTTP to your local dev server or maintain an outbound tunnel without a local process or a relay server. A one-line SSH command is the lightest way to expose localhost with no install.
What if my custom subdomain is already taken?
On tinyfi.sh, regenerate or edit the throwaway name until SSH connects. On localhost.run, the relay assigns a random URL when the session starts.
Is traffic encrypted? Who sees it?
SSH encrypts the tunnel to the relay provider. Visitors hit HTTPS on the public URL. Do not use this for production data or long-lived secrets; it is for demos, previews, and webhook tests.