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Set the user agent and viewport before navigating to the page, then capture the visible viewport or the full document. A user-agent override alone does not set the screen size: responsive layout is driven in part by the viewport, so specify both when reproducing a target device or browser.
What to set before taking the screenshot
Decide which browser engine and device identity you need to reproduce, and specify the corresponding settings before the page loads. Depending on the workflow, these can include:
- User agent: the browser-identification string sent with requests.
- Viewport: the page’s CSS-pixel width and height, which affect responsive breakpoints.
- Device scale factor: relevant when you need a particular pixel density.
- Touch or device mode: useful when the page responds to touch-capable device emulation.
A device preset may bundle several of these values. Check its user agent and dimensions rather than assuming the preset matches your exact target. Emulation is useful for repeatable responsive checks, but it does not prove that every behavior will match a physical device; verify on the target hardware if hardware-specific behavior matters.
Use Playwright for repeatable captures
Playwright device presets bundle emulation properties such as user agent, screen size, viewport, and touch support. Spread a preset into a browser context and then override its viewport if you need different dimensions. If you need an exact user-agent string, set it explicitly. Playwright also notes that you can leave the preset user agent undefined when you want the running test platform’s own user agent. See the Playwright emulation documentation and screenshot documentation.
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Install and run a complete example
In a new Node.js project, install Playwright and its Chromium browser:
npm install playwright
npx playwright install chromiumSave this as screenshot.mjs. It accepts a URL, user agent, width, height, and output path from the command line; it captures a full-page PNG.
import { chromium } from 'playwright';
const [url, userAgent, widthArg, heightArg, output = 'shot.png'] = process.argv.slice(2);
if (!url || !userAgent || !widthArg || !heightArg) {
console.error('Usage: node screenshot.mjs <url> <user-agent> <width> <height> [output.png]');
process.exit(1);
}
const width = Number(widthArg);
const height = Number(heightArg);
if (!Number.isInteger(width) || !Number.isInteger(height) || width < 1 || height < 1) {
throw new Error('Width and height must be positive integers.');
}
const browser = await chromium.launch();
try {
const context = await browser.newContext({
userAgent,
viewport: { width, height },
deviceScaleFactor: 1,
isMobile: false,
hasTouch: false,
});
const page = await context.newPage();
await page.goto(url, { waitUntil: 'networkidle', timeout: 60000 });
await page.screenshot({ path: output, fullPage: true });
await context.close();
} finally {
await browser.close();
}Example invocation (replace the example identity with the exact string you need):
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node screenshot.mjs https://example.com 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 Chrome/126.0.0.0 Safari/537.36' 390 844 mobile.pngUse a device preset when it matches your target
Import a preset from Playwright’s device list and pass it when creating the context. If custom dimensions are required, override viewport after spreading the preset. Likewise, override userAgent if the preset’s string is not the one you intend to test. Keep the selected browser engine in mind: a preset’s properties do not make Chromium behave as another engine.
import { chromium, devices } from 'playwright';
const preset = devices['iPhone 13'];
const browser = await chromium.launch();
const context = await browser.newContext({
...preset,
viewport: { width: 390, height: 844 },
userAgent: 'YOUR_EXACT_USER_AGENT_STRING',
});Choose the right capture extent
fullPage: falsecaptures the current viewport.fullPage: truecaptures the full scrollable page.locator(selector).screenshot()captures one element.
Full-page capture does not necessarily trigger content that loads only as you scroll. For lazy-loaded images or sections, scroll through the page first, wait for the expected content, and then capture.
Use Puppeteer for a custom user agent or device profile
Puppeteer’s Page.emulate(device) applies a device’s metrics and user agent. Its documentation describes it as a shortcut for Page.setUserAgent() and Page.setViewport(), and recommends emulating before navigation because some sites do not expect a phone-sized page to be resized after loading. For an arbitrary user-agent string and custom viewport, set both explicitly before navigating. See the Puppeteer emulation API.
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- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Complete Puppeteer example
Install Puppeteer, save the following as screenshot.cjs, and run it with the URL, user agent, width, and height:
npm install puppeteerconst puppeteer = require('puppeteer');
(async () => {
const [url, userAgent, widthArg, heightArg, output = 'shot.png'] = process.argv.slice(2);
if (!url || !userAgent || !widthArg || !heightArg) {
console.error('Usage: node screenshot.cjs <url> <user-agent> <width> <height> [output.png]');
process.exit(1);
}
const width = Number(widthArg);
const height = Number(heightArg);
if (!Number.isInteger(width) || !Number.isInteger(height) || width < 1 || height < 1) {
throw new Error('Width and height must be positive integers.');
}
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.setUserAgent(userAgent);
await page.setViewport({ width, height, deviceScaleFactor: 1 });
await page.goto(url, { waitUntil: 'networkidle2', timeout: 60000 });
await page.screenshot({ path: output, fullPage: true });
} finally {
await browser.close();
}
})();Choose fullPage: false for the visible viewport. If using page.emulate(device) instead of manual settings, call it before page.goto().
Take a one-off screenshot in Chrome DevTools
Chrome DevTools Device Mode is useful when you want to inspect a page manually without writing a script. Its responsive viewport can be configured with dimensions, device pixel ratio, user-agent string, and device type; the controls available can vary with the DevTools version. Follow the current Chrome DevTools Device Mode documentation for its controls and screenshot workflow.
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- Open the page in Chrome and open DevTools.
- Enable Device Mode and choose a device or responsive sizing.
- Set the viewport dimensions and, when needed, adjust the user-agent string, device pixel ratio, and device type.
- Reload the page after changing emulation settings so the page loads under the settings you intend to test.
- Use DevTools’ screenshot controls to capture the visible viewport or, where available, a full-size screenshot.
Device Mode is convenient for a single visual check. A script is easier to parameterize and rerun for many URLs or regression checks.
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ScreenshotNeo can return a website screenshot through one API request. The API accepts a user-agent parameter as well as viewport dimensions; see the ScreenshotNeo API documentation for parameter details. For a reproducible responsive capture, set both rather than relying on the user agent alone.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpUse the target URL you want to capture, and add the user-agent and viewport parameters described in the API documentation. ScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture; those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers indicate the page verdict and billing status. An MCP server provides screenshot tools 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 screenshots.
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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Troubleshooting mismatched screenshots
The page still looks like desktop
Check the viewport width first. A mobile user agent does not automatically create a narrow viewport or enable every mobile behavior. If the page depends on touch or device mode, set those emulation options as well.
The first screenshot differs from later reloads
Set emulation before navigation. A site may read the user agent or viewport during its initial request or page setup, so changing values after loading can produce a different result.
Images or sections are missing
Some pages load media only when it approaches the viewport. Scroll through the page to trigger lazy loading, wait for the relevant images or content to appear, and then capture.
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Some sites keep network requests open, so waiting for network idle can be unsuitable. Wait for a specific visible element or use an appropriate fixed delay instead of relying on network-idle alone. Increase the navigation timeout only when the page genuinely needs more time; a longer timeout does not fix a blocked or stalled load.
The layout matches, but device behavior does not
Emulation covers selected browser and device parameters, not every physical-device property. If the result depends on real hardware behavior, confirm it on the target device.
Performance and repeatability choices
For one manual inspection, DevTools avoids writing and maintaining a script. For repeat captures, automation makes the URL, user agent, viewport, and capture type explicit inputs that can be reused. Full-page captures and lazy-loaded content may take longer than a viewport shot because more of the page must be rendered. Keep the capture settings identical between runs, including browser engine and device scale factor, when comparing screenshots.
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