RT

Test Your Website
On Every Screen.

Paste your website URL and instantly preview how it behaves across phones, tablets, laptops and desktop screens — including localhost development servers.

Built for developers

📱

Responsive Testing

True viewport testing. Your site media queries react to the actual iframe dimensions — not CSS scaling tricks.

📶

Localhost Support

Test http://localhost:3000, :5173, 127.0.0.1, and LAN IPs. Perfect for local development workflows.

🖥

Multiple Devices

Mobile, tablet, laptop, desktop presets plus custom widths and heights. Switch instantly.

📏

Developer Tools

Rulers, grid overlays, safe-area simulation, zoom, orientation, and fullscreen preview.

⛶

Custom Viewports

Enter any width and height between 200–5000px. Breakpoint toolbar for quick jumps.

📸

Keyboard Shortcuts

R refresh, F fullscreen, +/- zoom, 0 reset. Designed to feel like a native developer tool.

🌐

Works with local servers

Running a Vite, Next.js, or any local server? Paste the URL and test responsive layouts without deploying.

http://localhost:5173http://localhost:3000http://192.168.1.10:5173

Ready to test?

Open the tester, paste your URL, and start checking layouts.