Free responsive website tester — preview at every device size
Paste a URL, switch between desktop, laptop, tablet, and mobile viewports, and see how your site responds. Free, no sign-up.
Responsive design checks belong inside your build process, not after launch. This free tester lets you sanity-check any URL at four common breakpoints — desktop, laptop, tablet, and mobile — without installing devtools or DevTools profiles. Paste a URL, click a viewport, see the result. If you do this often, WebPinch’s in-app review lets you pin feedback at each breakpoint and route every issue to a Kanban board.
- Four common viewports: 1440×900, 1280×800, 768×1024, 375×812
- Open the URL in a new tab with one click
- Reload without reloading the whole page
- Runs entirely in your browser
- Works for any URL that allows iframe embedding
FAQ
How accurate is the responsive tester?
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The tool loads the URL in a real browser iframe at the exact pixel dimensions of each viewport. What you see is what a user on that device would see, minus device-specific quirks (notch cutouts, browser chrome height, etc.).
Why is the preview blank for some sites?
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Some sites block iframe embedding via the X-Frame-Options or frame-ancestors headers. There’s no way around that client-side. WebPinch’s in-app review uses a server proxy that handles this case.
Can I test localhost or staging sites?
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Only if your browser can reach them and they don’t block iframe embedding. Localhost works if you’re running this tool in the same browser.
Does WebPinch let me leave feedback on the responsive view?
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Yes — inside the WebPinch dashboard, you can toggle between desktop, tablet, and mobile and pin feedback on any of them, with the screen size saved per pin.
Liked this tool? You’ll love WebPinch.
Pin feedback on any website, capture screenshots automatically, and track everything on a Kanban board. Free to start.