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Set the browser’s viewport width and height explicitly in CSS pixels before loading the page, then capture the visible viewport rather than the full page. For automated captures, Playwright offers direct control over viewport size and whether output pixels map to CSS pixels or device pixels. Use mobile emulation as well when the page needs mobile-specific behavior such as touch input or a mobile user agent.
What “exact CSS viewport” means
A CSS viewport is the width and height, in CSS pixels, that the browser uses as the page’s visible layout area. It is not necessarily the screenshot’s pixel dimensions. Device pixel ratio (DPR) relates physical screen pixels to CSS pixels, while the screenshot scale determines how those dimensions map into the image.
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- With a 390 × 844 CSS viewport and Playwright’s
scale: 'css', the image is one pixel per CSS pixel: 390 × 844 image pixels. - With
scale: 'device', the image uses device pixels. At a DPR greater than 1, its pixel dimensions can be larger than the CSS viewport dimensions.
Choose the viewport to control responsive layout. Choose screenshot scale and device scale factor to control output pixels. If you need mobile browser characteristics—not just a narrow layout—also configure mobile emulation deliberately.
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Capture an exact viewport with Playwright
Create a browser context with explicit dimensions before opening the page. The example uses a 390 × 844 CSS viewport, enables mobile emulation, and requests one screenshot pixel per CSS pixel.
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const context = await browser.newContext({
viewport: { width: 390, height: 844 },
isMobile: true,
deviceScaleFactor: 1,
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'mobile-390x844.png', scale: 'css' });Replace the example URL with the page you want to capture. The browser object must already be launched in your Playwright setup. Set the context viewport before navigation so the page loads at the intended size.
Choose the right emulation settings
If you are checking only responsive CSS at a particular width and height, the explicit viewport may be all you need. If behavior depends on mobile browser characteristics, set mobile emulation properties too. Playwright device presets can simulate properties such as user agent, screen size, viewport, and touch support; you can override a preset’s viewport by setting your custom viewport afterward. See the Playwright emulation documentation.
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Keep deviceScaleFactor and screenshot scale distinct. The former sets the emulated device’s pixel ratio; the latter controls screenshot output scaling. Use scale: 'css' for one output pixel per CSS pixel, or scale: 'device' when device-pixel output is required. The Playwright Page API documents the screenshot options.
Viewport capture versus full-page capture
The default Playwright screenshot is a viewport capture. It records the configured visible area. Add fullPage: true only when you want the full scrollable page; that output is not a fixed-height viewport screenshot.
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Capture manually in Chrome DevTools
- Open Chrome DevTools and turn on Device Mode.
- Choose Responsive Viewport Mode, then enter the required width and height in the viewport fields.
- If mobile characteristics matter, select the intended device type and set the device pixel ratio as needed.
- Choose Capture screenshot for the visible viewport, or Capture a full size screenshot for the entire page.
DevTools also allows custom device definitions with a name and dimensions. Device pixel ratio, user agent, and device type are optional fields for a custom device. For details on sizing, device simulation, and capture commands, see Chrome DevTools Device Mode.
Use Puppeteer with a mobile device preset
Puppeteer’s page.emulate(device) applies device metrics and user agent. Apply it before navigating: resizing after a page has loaded can affect sites that do not expect a phone-sized viewport change.
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await page.emulate(puppeteer.KnownDevices['iPhone 13']);
await page.goto('https://example.com');
await page.screenshot({ path: 'mobile.png' });For an exact custom CSS viewport rather than a named preset, configure the viewport directly and set any other emulation settings the page requires. The device preset’s viewport may need to be overridden if its dimensions do not match your target. Puppeteer describes page.emulate() in its Page.emulate() documentation.
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| Approach | Best for | Key control |
|---|---|---|
| Playwright | Repeatable automated captures or tests | Explicit context viewport and screenshot scale |
| Chrome DevTools Device Mode | Quick manual capture and visual inspection | Enter width and height; choose device type and DPR if needed |
| Puppeteer | Scripted Chrome automation using device presets | Emulate before navigation and keep metrics consistent |
Use a custom viewport when the target is a precise CSS layout size. Choose a device profile when the page’s behavior depends on mobile emulation. For repeatable comparisons, keep the browser, viewport width and height, device scale factor, emulation options, page state, and capture mode consistent.
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Troubleshooting mismatched screenshots
- The screenshot’s pixel dimensions exceed the viewport. The viewport is measured in CSS pixels, while the image may be using device pixels. Select
scale: 'css'for Playwright output at one pixel per CSS pixel. - The page lays out like desktop despite a phone-sized capture. A custom width and height set the layout area, but may not reproduce all mobile browser behavior. Add the needed mobile emulation properties or use a device preset.
- The page changes after resizing. Set viewport and emulation before navigation. Puppeteer specifically recommends applying emulation before navigating.
- The screenshot is much taller than requested. Check that full-page capture is off. A full-page screenshot includes the scrollable page rather than just the fixed viewport.
- Two captures at the same size differ. Confirm the same browser, width, height, device scale factor, emulation settings, page state, and capture mode are used. The viewport alone does not make the entire capture setup identical.
Or skip the browser setup
ScreenshotNeo can return a screenshot from one GET request. Its API accepts the familiar screenshot parameters other tools use, including viewport and device-related options. Consult the ScreenshotNeo API documentation for the supported parameters and defaults.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers report the page verdict and billing status. Its MCP server lets AI agents use take_screenshot, get_page_info, and capture_pdf. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 screenshots.
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Does a 390 × 844 CSS viewport always produce a 390 × 844 image?
No. It does when using one image pixel per CSS pixel; device-pixel scaling can produce a larger image.
Should I use a device preset or a custom viewport?
Use a custom viewport for a precise layout size. Use a device preset or explicit mobile emulation when mobile browser characteristics are part of the behavior you need to capture.
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