CHROME RESPONSIVE TESTING
Open mobile view from the page you are already testing.
A mobile view Chrome extension is useful when you need several responsive layouts visible at once, especially for localhost, authenticated applications, and rapid checks during frontend development.
Mobile View & Responsive Tester is MIT licensed, requires no account, and has no extension analytics, telemetry, remote logging, or application backend.
Install and start from the current Chrome tab
- Install Mobile View & Responsive Tester from the Chrome Web Store.
- Open the website or local development page you want to test.
- Select the extension from the toolbar or use its page context menu.
- Start with a phone and laptop, then add a tablet or custom breakpoint.
Why use an extension instead of an online checker?
A public URL checker is convenient for a deployed marketing page. It often cannot access localhost, private staging, authenticated routes, or a page state that exists only in your browser session. A local extension starts from the active tab and keeps screenshots, settings, design references, and generated prompts in your browser.
Compare the viewports that represent your users
Open up to four previews and select a compact phone, a large phone or foldable, a tablet, and a laptop. Rotate supported devices and add exact custom sizes when analytics or a bug report identifies a particular viewport. Use saved sets for repeated release checks.
Keep long pages and navigation aligned
Scroll synchronization helps compare the same content section across several layouts. Navigation synchronization follows matching links so you can see whether a journey remains usable after a responsive change. Disable synchronization whenever each preview needs a different state.
Move from a visual bug to an actionable fix
- Compare the live page beside or over an approved design.
- Capture and annotate the active viewport or full workspace.
- Record the source tab when motion or interaction matters.
- Copy a structured AI fix prompt containing the page, viewports, expected result, and verification guidance.
Chrome extension vs DevTools device mode
DevTools remains the best place to inspect CSS, network activity, console errors, and one viewport in detail. A multi-device extension is optimized for comparative review. Use the extension to identify the failing width, DevTools to diagnose it, and physical devices to confirm browser and hardware behavior.