Use Chrome DevTools’ Device Mode to set a responsive viewport, then choose Capture screenshot for the visible area or Capture a full size screenshot for the entire page. This gives you a quick way to document how a site lays out at selected widths, but it is an approximation—not a substitute for checking behavior on real devices when fidelity matters.
Set the responsive viewport
- Open the page in Chrome and open DevTools. Click Toggle device toolbar in the DevTools action bar. Device Mode opens with Responsive dimensions selected by default. See Chrome’s Device Mode documentation.
- To choose a named size, open the Dimensions menu and select a device preset. To set an exact viewport, stay in Responsive mode and either drag the viewport handles or enter width and height values.
- To inspect responsive breakpoints, enable Show media queries. The breakpoint bars show max-width and min-width queries; click between markers to change the viewport width and see the layout at that point.
- If your test requires it, adjust device type, device pixel ratio, orientation, or zoom in the device toolbar. For a device-specific capture with a visible frame, select More options > Show device frame before taking the screenshot.
Chrome’s documented Responsive width presets are configuration examples, not universal breakpoints:
| Preset | Width |
|---|---|
| Mobile S | 320 px |
| Mobile M | 375 px |
| Mobile L | 425 px |
| Tablet | 768 px |
| Laptop | 1024 px |
| Laptop L | 1440 px |
| 4K | 2560 px |
Use a preset for a quick, repeatable spot check. For a layout bug or a breakpoint-specific design review, enter the width you need or use the media-query markers rather than assuming a preset represents your site’s breakpoint.
Capture the viewport or the full page
In the Device toolbar, open More options and choose the capture type that matches your purpose:
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- Capture screenshot saves the currently visible emulated viewport.
- Capture a full size screenshot captures the page beyond the visible viewport, including content lower down the page.
When the device-specific frame is enabled, the capture can include that frame. The viewport capture is useful for documenting a particular responsive state; use the full-size option when you need the whole page in one image.
What Device Mode does—and does not—validate
Chrome describes Device Mode as a first-order approximation of the mobile experience: the page still runs on your development computer, not on a phone. Device Mode is useful for checking layout at selected dimensions, but it does not reproduce every difference in mobile CPU architecture, browser APIs, CSS support, or device behavior. Chrome’s guidance is to check on an actual mobile device when in doubt. See Device Mode and Chrome’s guidance on emulating and testing other browsers.
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For assurance across browsers and devices, test on the intended real devices and browsers. Emulators are useful for responsive checks, but cannot guarantee identical API, CSS, and mobile-browser behavior. A device simulator may help with operating-system-integrated behavior such as a virtual keyboard. Chrome names BrowserStack as an optional hosted service for manual testing across selected operating systems, browser versions, and device types in its other-browser testing guidance; it is not required to capture screenshots in DevTools.
Use Network screenshots to inspect loading progress
If the question is how a page changes while it loads—not how it looks at a deliberately selected responsive width—the Network panel has a separate screenshot workflow. In Network settings, enable Screenshots, then reload the page; Chrome’s documented sequence uses Empty Cache And Hard Reload. DevTools displays thumbnails from different loading intervals alongside network activity. This is useful for tracing loading progression, but it is not a replacement for setting a responsive viewport and taking a deliberate screenshot. See Chrome’s Network panel documentation.
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For repeatable captures in a script or service, ScreenshotNeo takes a screenshot from one GET request. Its API accepts a URL and returns an image or PDF; the example below requests a WebP capture of a page.
ScreenshotNeo API documentation
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and the response identifies the page verdict and billing status in headers. Its MCP server offers take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots. Every feature is available on every plan.
Sign up for ScreenshotNeo’s free plan: 1,000 screenshots a month, no card required.
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Frequently Asked Questions
Does Chrome Device Mode run the page on an actual phone?
No. It simulates a mobile experience from the development computer. For device-specific behavior, validate on the intended real device.
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Which DevTools option captures the entire page?
In the Device toolbar’s More options menu, choose Capture a full size screenshot.
Can I use a custom responsive width instead of a preset?
Yes. In Responsive mode, enter the width and height or drag the viewport handles.
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