Responsive Device Viewer & Mobile Tester

Tracking since May 12, 2026.

Changelog

• May 24, 2026
  description

  Multi Device Viewer opens a full-screen simulator overlay on the page you are already on. Click the extension icon, and the current site immediately appears inside realistic device frames without navigating away or opening a new tab. Close the overlay and the page is exactly as you left it.
  
  Preview across devices
  - Compare up to four device viewports side by side in resizable panels.
  - Choose from a built-in catalog of phones, tablets, laptops, desktops, watches, and TVs.
  - Switch orientation, zoom, fit mode, and reload each panel independently.
  - Save favorites, browse recents, or create a custom viewport size.
  
  Realistic device shells
  - Accurate frame profiles for every device category.
  - Phone, tablet, laptop, desktop, and watch shell renderings.
  
  Capture & Annotate
  - One click in the sidebar captures the entire simulator view as-is.
  - Built-in annotation editor: pen, rectangle, arrow, text, and crop tools.
  - Eight-color palette, three stroke widths, font size picker.
  - Crop bakes your annotations into a trimmed canvas.
  - Copy to clipboard or download. Everything stays on your machine.
  
  Privacy-first by design
  - No account required.
  - No backend service.
  - No analytics, telemetry, or remote logging.
  - Screenshots, URLs, annotations, and settings never leave your browser.
  - Preferences saved locally in Chrome storage.

  Multi Device Viewer is a responsive testing and mobile preview extension for checking how websites look across phones, tablets, laptops, desktops, watches, and TVs. Open the extension on any page to compare multiple device viewports side by side without leaving the site.
  
  Click the extension icon or use the Chrome context menu, and the current site immediately appears inside realistic device frames without navigating away or opening a new tab. Close the overlay and the page is exactly as you left it.
  
  Responsive Website Testing
  - Compare up to four device viewports side by side in resizable panels.
  - Choose from a built-in catalog of phones, tablets, laptops, desktops, watches, and TVs, including newer iPhone profiles.
  - Switch orientation, zoom, fit mode, and reload each panel independently.
  - Use the global URL bar to send a page to every active preview.
  - Save favorites, browse recents, or create a custom viewport size.
  - Turn on dark mode or inspect mode for focused responsive QA.
  
  Mobile, Tablet, Desktop, and Laptop Preview
  - Test mobile view, tablet layouts, laptop breakpoints, desktop screens, watch layouts, and TV previews in one workspace.
  - Use realistic device shells for phone, tablet, laptop, desktop, and watch previews.
  - Move quickly between common responsive design breakpoints and exact custom viewport sizes.
  
  Presets for repeat QA
  - Start from built-in layouts like Mobile vs Tablet, iOS vs Android, and Android + Tablet + Laptop.
  - Save your own named device layouts.
  - Import or export preset JSON for reuse across local browser profiles.
  
  Screenshots, Mockups, and Annotations
  - One click in the sidebar captures the entire simulator view as-is.
  - Built-in annotation editor: pen, rectangle, arrow, text, and crop tools.
  - Eight-color palette, three stroke widths, font size picker.
  - Crop bakes your annotations into a trimmed canvas.
  - Copy to clipboard or download — everything stays on your machine.
  
  Privacy-first by design
  - No account required.
  - No backend service.
  - No analytics, telemetry, or remote logging.
  - Screenshots, URLs, annotations, and settings never leave your browser.
  - Preferences, presets, recents, custom devices, and UI state are saved locally in Chrome storage.

• May 24, 2026
  short_description

  Preview and compare websites across local device viewports with screenshots, annotations, and realistic mockups.

  Responsive website tester for mobile, tablet, desktop, and laptop previews with screenshots, mockups, and annotations.

• May 24, 2026
  name

  Multi Device Viewer

  Responsive Device Viewer & Mobile Tester

• May 24, 2026
  permissions

  activeTab, debugger, declarativeNetRequest, declarativeNetRequestWithHostAccess, downloads, scripting, storage, tabs

  activeTab, contextMenus, debugger, declarativeNetRequest, declarativeNetRequestWithHostAccess, downloads, scripting, storage, tabs

• May 17, 2026
  description

  Multi Device Viewer is a local-first responsive testing tool for Chrome. Open any website in a dedicated simulator tab, preview it across popular phones, tablets, laptops, desktops, watches, and TVs, then capture screenshots or annotate findings without sending your work to a remote service.
  
  Use it to:
  - Compare up to four device previews side by side.
  - Switch orientation, zoom, fit mode, and reload per device.
  - Browse a built-in catalog of real device viewport profiles.
  - Save favorites, recents, and custom viewport sizes locally.
  - Export screenshots and review them on an annotation board.
  - Use packaged transparent device mockups for cleaner presentation captures.
  
  Privacy-first by design:
  - No account required.
  - No backend service.
  - No analytics or telemetry.
  - No remote storage of screenshots, URLs, annotations, or settings.
  - Data is stored locally in Chrome storage on your device.

  Multi Device Viewer opens a full-screen simulator overlay on the page you are already on. Click the extension icon, and the current site immediately appears inside realistic device frames without navigating away or opening a new tab. Close the overlay and the page is exactly as you left it.
  
  Preview across devices
  - Compare up to four device viewports side by side in resizable panels.
  - Choose from a built-in catalog of phones, tablets, laptops, desktops, watches, and TVs.
  - Switch orientation, zoom, fit mode, and reload each panel independently.
  - Save favorites, browse recents, or create a custom viewport size.
  
  Realistic device shells
  - Accurate frame profiles for every device category.
  - Phone, tablet, laptop, desktop, and watch shell renderings.
  
  Capture & Annotate
  - One click in the sidebar captures the entire simulator view as-is.
  - Built-in annotation editor: pen, rectangle, arrow, text, and crop tools.
  - Eight-color palette, three stroke widths, font size picker.
  - Crop bakes your annotations into a trimmed canvas.
  - Copy to clipboard or download. Everything stays on your machine.
  
  Privacy-first by design
  - No account required.
  - No backend service.
  - No analytics, telemetry, or remote logging.
  - Screenshots, URLs, annotations, and settings never leave your browser.
  - Preferences saved locally in Chrome storage.

• May 17, 2026
  short_description

  Test websites across multiple local device viewports with screenshots, annotations, and mockups.

  Preview and compare websites across local device viewports with screenshots, annotations, and realistic mockups.

• May 17, 2026
  permissions

  activeTab, downloads, storage, tabs

  activeTab, debugger, declarativeNetRequest, declarativeNetRequestWithHostAccess, downloads, scripting, storage, tabs

Permissions & access

Permissions

activeTabcontextMenusdebuggerdeclarativeNetRequestdeclarativeNetRequestWithHostAccessdownloadsscriptingstoragetabs

Host access

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Screenshots