Next.js app preview
instatunnel 3000 --subdomain next-previewOpen https://next-preview.instatunnel.my on a phone, tablet, or teammate laptop.
Localhost tunnel in seconds
Share your local app with teammates, clients, or mobile devices using a secure public URL.
Optimized onboarding path
Expose localhost in seconds
Quickest path for demos and local QA.
Expose localhost in seconds
Start freeAnswer-first summary
How do I share localhost securely in minutes?
Install InstaTunnel CLI, authenticate once, and start a tunnel on your local port. You get an HTTPS public URL that works for demos, mobile testing, QA, and webhook callbacks.
Last reviewed: March 5, 2026
Compatibility: Works with local HTTP services on common frameworks. Use v1 default for standard traffic; v2 for streaming MCP clients.
Quick command
instatunnel 3000 --subdomain localhost-demoCommon failures and quick fixes
- No connection to localhost-Confirm your app is running on the same local port and protocol.
- Shared URL returns 502/404-Restart local service, then restart tunnel to refresh endpoint routing.
Stable URLs
Custom subdomains keep your share links consistent across restarts.
HTTPS by default
All tunnels are secured with SSL without extra configuration.
24-hour sessions
Keep demo environments live without frequent reconnects.
How it works
Step 1
Install
npm install -g instatunnelStep 2
Run
it --port 3000Step 3
Share
Send the generated URL to anyone who needs access.
Localhost tunnel examples that match real work
Use the same tunnel pattern for frontend QA, backend webhook callbacks, and stakeholder demos.
Vite dev server
instatunnel 5173 --subdomain vite-demoShare a stable HTTPS URL while keeping the Vite dev server running locally.
FastAPI backend
instatunnel 8000 --subdomain api-qaLet QA call local API endpoints through https://api-qa.instatunnel.my.
Decision table
| Workflow need | InstaTunnel | Common alternative |
|---|---|---|
| Sharing with teammates | One HTTPS URL points to your local service during active development. | Screenshots or staging deploys slow down review loops. |
| Webhook testing | External providers can POST directly to localhost through the tunnel. | Provider callbacks usually require a public staging endpoint. |
| Stable demos | Reserved subdomains keep links memorable and reusable. | Random URLs can break docs, tickets, and provider configuration. |
Common questions
What is a localhost tunnel?
A localhost tunnel gives your local development server a public HTTPS URL so external services, teammates, and mobile devices can reach it.
Can I use it for mobile device testing?
Yes. Start the tunnel on your local app port and open the generated HTTPS URL from the phone or tablet you are testing.
Do I need to deploy to staging first?
No. InstaTunnel forwards requests directly to your local service, so you can review features before creating a staging build.
Use a tunnel for every workflow
Great for demos, QA, mobile testing, and remote debugging.