SEO UTILITIES
Screen Resolution Simulator — Preview Site Sizes
Preview how a webpage looks at different screen resolutions in an iframe. Check responsive layouts across desktop, tablet, and mobile widths, free.
I tuoi file non lasciano mai il tuo dispositivo.
Some sites refuse to be embedded (X-Frame-Options) and will show blank here — that's the target site's policy, not a bug.
This simulator loads a webpage inside a resizable frame set to common screen resolutions, so you can see how a responsive layout adapts from a wide desktop down to a phone width without owning every device. It's a quick sanity check on whether your breakpoints behave — but read the honest limitations below before you rely on it.
How to use it
- Enter the URL of the page you want to preview.
- Pick a resolution or width to load the page inside the frame.
- Switch between sizes and watch how the layout reflows.
Troubleshooting
- The site won't load — the frame is blank or shows an error.
- Many sites send an X-Frame-Options or Content-Security-Policy frame-ancestors header that forbids being embedded in another page (a clickjacking defence). When they do, the browser blocks the frame and there is no workaround from a tool — it's the site's own security choice.
- A private staging site won't preview.
- The URL has to be reachable by your browser. A local dev URL works if you're on the same machine and it isn't blocking frames; a staging site behind a login generally won't load.
Frequently asked questions
- Is this the same as testing on a real device?
- No. It approximates the viewport width, which catches most layout issues, but real devices differ in pixel density, touch behaviour, browser quirks, and performance. Use it for a fast first pass, then verify critical pages on actual hardware.
- Does it simulate touch and mobile browser features?
- It simulates the screen dimensions, not the full device. For touch events and mobile rendering, use your browser's built-in device mode or a real phone.