Abhi Arya

Responsive Testing Lab

Preview any website at several screen sizes side by side — desktop, tablet and mobile — with a master device and synchronised navigation, scroll and clicks where the browser allows it.

Preview one website at several viewport sizes side by side. Everything runs in your browser; nothing is uploaded.

Viewport simulations — not real hardware emulation

Only http:// and https:// addresses. Some websites forbid being shown inside another page; those can be opened in a new tab instead.

Sync Actions
Quick presets Click a device to add it (portrait). Use the rotate button on a card for landscape. Sizes are viewport simulations, not real device rendering.

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