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Set the browser’s responsive viewport to 400 CSS pixels wide, then capture either the visible screen or the full page. In Chrome, do this with DevTools Device Mode; for repeatable captures, use Playwright. “For Indian users” affects the test only if the site varies by location, language, or regional preferences—it does not change the viewport setting.
What 400 pixels wide means
For responsive layout testing, use a viewport width of 400 CSS pixels. CSS pixels drive layout and media queries; they are not necessarily the same as the physical pixels in the saved image. Device pixel ratio (DPR) is the ratio of physical pixels to logical CSS pixels, so a high-DPI capture can be wider than 400 raster pixels. Playwright’s screenshot scaling lets you choose CSS-pixel or device-pixel output. If the file itself must be exactly 400 pixels wide, use CSS scaling and inspect the saved image dimensions.
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Browser zoom is not a substitute for setting the viewport width.
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Capture a 400 CSS-pixel screenshot in Chrome
- Open the page in Chrome and open DevTools.
- Select Toggle device toolbar.
- In the device dimensions menu, choose Responsive.
- Enter 400 in the width field. Set the height to the portion of the page you want visible.
- If mobile rendering or touch behavior matters, set the device type to Mobile. Chrome distinguishes Mobile, Mobile (no touch), and Desktop modes by rendering behavior and event types.
- Wait for the page to settle. Open More options > Capture screenshot for the visible viewport, or choose Capture a full size screenshot for the whole scrollable page.
- Check the saved image’s dimensions if the deliverable must be exactly 400 raster pixels wide.
Chrome Device Mode can also display media-query breakpoints and simulate geolocation; it offers network and CPU throttling for optional testing. These settings are separate from setting the viewport width. Chrome describes Device Mode as a way to “approximate how your page looks and performs on a mobile device.” Chrome DevTools Device Mode documentation
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Automate the capture with Playwright
Set the viewport before navigation so the page can respond to the intended dimensions as it loads. This runnable Node.js example saves the visible viewport at CSS-pixel scale:
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage({
viewport: { width: 400, height: 850 },
deviceScaleFactor: 1
});
await page.goto('https://example.com');
await page.screenshot({ path: 'mobile-400.png', fullPage: false, scale: 'css' });
await browser.close();
})();Replace https://example.com with the target page. Set fullPage: true to capture content below the fold; this changes the image height, not the 400 CSS-pixel viewport width. Playwright’s scale: 'css' gives one output pixel per CSS pixel, whereas device scaling can produce a larger raster image. See the Playwright screenshot documentation for viewport and screenshot options.
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Account for Indian location or language only when needed
The 400-pixel width setting is the same regardless of the audience. Add locale, timezone, or geolocation emulation only if the site or test brief calls for it—for example, if a page changes language or regional content according to those settings. Playwright supports emulating locale, timezone, and geolocation; Chrome DevTools also supports geolocation simulation. Playwright emulation documentation
A simulated location or locale does not establish exactly what a person in India will see on their own handset, carrier, account, or network. Desktop emulation approximates mobile behavior; when hardware-specific fidelity matters, verify on a physical phone or use remote debugging with the page running on that phone. Chrome DevTools Device Mode documentation
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- MEMORIES MADE PICTURE PERFECT: Capture every angle in stunning clarity, from wide family photos to close-ups of friends, with the triple-lens camera on Galaxy A17 5G.
- NEED MORE STORAGE? WE HAVE YOU COVERED: With an improved 2TB of expandable storage, Galaxy A17 5G makes it easy to keep cherished photos, videos and important files readily accessible whenever you need them.³
- BUILT TO LAST: With an improved IP54 rating, Galaxy A17 5G is even more durable than before.⁴ It’s built to resist splashes and dust and comes with a stronger yet slimmer Gorilla Glass Victus front and Glass Fiber Reinforced Polymer back.
Choose the capture that matches the deliverable
- One-off check: Chrome DevTools is a direct manual option.
- Repeatable capture: Use Playwright and set the viewport before navigating.
- Visible screen or whole page: Use a viewport screenshot for the currently visible area, or full-page capture for content below the fold.
- Exactly 400 pixels in the image file: Use CSS-pixel scaling and confirm the output dimensions; device-pixel scaling can yield a wider image.
- Hardware-specific behavior: Check on a real phone in addition to emulation.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. Its API can return an image or PDF from one GET request; this example requests a screenshot for a 400-pixel-wide viewport. See the ScreenshotNeo documentation for API parameters.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -d width=400 -o shot.webpCookie banners, newsletter popups, and chat widgets are removed before capture, with each cleanup step configurable. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed; response headers report the page verdict and billing status. An MCP server lets AI agents use screenshot tools. The free plan includes 1,000 screenshots per month with no card required; paid plans start at $5 for 3,000 shots.
Sign up for ScreenshotNeo’s free plan to get 1,000 screenshots a month without a card.
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Troubleshooting
- The saved image is wider than 400 pixels: The viewport may be 400 CSS pixels while the output uses device-pixel scaling. Select CSS-pixel scaling for an image that follows CSS dimensions, then check the raster file.
- The screenshot cuts off content: A viewport capture includes only the visible area. Use Chrome’s full-size screenshot option or set Playwright’s
fullPage: truewhen you need the scrollable page. - The page layout does not match the target width: Confirm that the responsive width field or Playwright viewport is 400, rather than relying on browser zoom. In Playwright, configure the viewport before navigating.
- The page differs from what an Indian user sees: Check whether the page depends on locale, timezone, or geolocation, and emulate those only when required. For device or network-specific differences, test on a physical phone.
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