Viewport Ruler

One-click responsive viewport width switcher for Chrome and Edge

Browser extensionfreeChina

Viewport Ruler is a Chrome/Edge extension that switches the current page's viewport width with one click using pure CSS simulation limited to the active tab, with five built-in standard breakpoints and a real-device size list. It's built for web developers who want a fast way to check responsive layouts without resizing the actual browser window each time.

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