Viewport Wall

See your website on every screen at once. Multi-device responsive testing wall with synchronized navigation and scroll.

Viewport Wall turns one browser tab into a wall of devices. Type a URL once and the same page appears on every phone, tablet, laptop, watch and TV you have added, each at its real viewport size and pixel density. Everything stays inside the single tab. No extra windows, no popups. FEATURES - Real device emulation: viewport size, device pixel ratio, touch input and optional mobile user agent, driven by Chrome's own DevTools protocol. - Live frames: each device streams what it is painting, so scrolling and animation appear on the wall as they happen. - Sync switch: navigation, scrolling, clicks and typing on one device happen on all of them, or only on the device you touch. - A device library covering phones, foldables (open and folded), tablets, laptops, desktops, ultrawides, watches and TVs, plus any custom width. - Foldables fold and unfold in place, so you can compare both screens of the same device on the same page. - Interactive mode for local development servers: the page runs in a live frame with no capture pipeline at all. - Screenshots of one device, of a full page, or of the whole wall, plus WebM recording. - Saved device sets, saved sessions, breakpoint detection and per-device QA notes. - Dark and light themes. A NOTE ON THE YELLOW BANNER Chrome shows a "Viewport Wall started debugging this browser" banner while the wall is open. This is Chrome's own notice, shown to every extension that uses the debugger API, and it cannot be hidden. The extension uses that API because it is the only way to emulate device metrics and touch input and to read frames from a background tab. Closing the wall ends it. PRIVACY No accounts, no servers, no analytics, no data collection. Everything stays in your browser.