What does am I responsive do?

It loads one URL inside four device frames at once, desktop, laptop, tablet and phone, so you can see your whole responsive layout in a single view. Switch to single device mode to test one exact viewport.

Is this a free responsive design checker?

Yes. It is a free responsive design checker that works online in your browser with no account or install. Test any URL across mobile, tablet and desktop viewports.

Can I test a specific CSS breakpoint?

Yes. In single device mode you can pick a preset or type a custom width and height, then rotate it, to check exactly where a media query changes your layout.

A frame is empty, what happened?

The site sent an X-Frame-Options or frame-ancestors header that blocks embedding. That is a setting on the target site and affects every framed checker. Pages you own will render normally.

Am I Responsive? Free Responsive Design Checker

Am I responsive? Paste a URL and this responsive design checker renders it inside desktop, laptop, tablet and phone frames at the same time, so you can screenshot the set or spot a broken layout without resizing a thing. Switch to single device mode to use it as a precise viewport tester: pick a preset or type a custom width and watch your CSS breakpoints respond. This responsive web design checker runs entirely in your browser with nothing to install.

Demo page

Desktop 1280

Laptop 1024

Tablet 768

Phone 375

A demo page is loaded so the viewports work right away. Paste your own URL to test it. Switch to Single device to check one exact breakpoint. Some sites block embedding (an X-Frame-Options or frame-ancestors policy); if a real URL stays blank, the site refused the connection. Open the URL in a new tab.

Am I responsive: see every screen size at once

The am I responsive view answers a simple question fast: does my site hold up everywhere. Instead of resizing a window over and over, you paste a URL and get desktop, laptop, tablet and phone side by side, each scaled to its real proportions. It is the quickest sanity check before a launch or a client hand-off, and the clean four device layout makes a tidy screenshot for a portfolio or deck.

Using it as a responsive design checker

Switch to single device mode and the same tool becomes a focused responsive design checker. Load a live URL, pick a preset or type a custom width and height, and rotate between portrait and landscape. Because this responsive web design checker runs online in your browser, there is nothing to install and no wait.

Preset device viewports (mobile, tablet, desktop)

The presets map to widths people actually browse on: small and standard phones, portrait and landscape tablets, a typical laptop, and a full desktop. Start narrow and work wider so you see the mobile experience the way most of your traffic will.

Testing CSS breakpoints and media queries

Breakpoints are the widths where your layout changes. Set the width just below and just above each breakpoint and confirm the design switches cleanly, with no clipped text, overlapping elements or horizontal scroll. Testing the common widths first, then the awkward in-between sizes, catches most media query mistakes before real visitors do.

Troubleshooting cross-origin frame restrictions

If a URL stays blank, the site is refusing to be embedded. This is a security setting on the target site, not a fault in the tool, and it affects every framed responsive checker the same way. Preview a page you control, or use the open in new tab link to inspect it directly.