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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse a browser automation script to capture every URL at every viewport size you care about. With Playwright, set each page’s viewport before navigating, then save one screenshot per URL-and-size pair. This lets you compare responsive layouts consistently instead of resizing pages by hand.
Plan the URL-by-viewport matrix
Start by listing the pages to capture and the viewport dimensions that matter. The work is a matrix: each URL is paired with each viewport, and each pair gets its own fresh capture. For example, three websites and two viewport sizes produce six screenshots.
Choose dimensions intentionally. A desktop width and a narrow mobile width can reveal responsive breakpoints, but use the same dimensions for all sites when the goal is comparison. For each output, include a recognizable site key and dimensions in the filename, such as store__1440x900__viewport.png. This naming pattern is a workflow convention, not a Playwright requirement.
Choose viewport, full-page, and scale settings
Viewport or full page
A viewport screenshot captures the visible browser area at the configured width and height. It is generally the right choice for comparing how different sites arrange content at a fixed screen size. A full-page screenshot captures the page’s full scrollable height; it is useful for documenting the whole page, but it is not an equivalent fixed-height comparison. Playwright documents the screenshot controls in its Page API.
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CSS pixels or device pixels
Playwright can save screenshots at CSS-pixel scale or device-pixel scale. CSS scale gives one output pixel per CSS pixel. Device scale reflects device pixels and can produce larger image dimensions on high-DPI configurations. Pick one scale and keep it consistent across the comparison set. See Playwright’s Emulation guide for viewport and device emulation details.
Viewport testing or device emulation
For responsive-width checks, a viewport is often enough. If you need a more realistic emulated device configuration, Playwright can also configure screen size, user agent, and touch-related properties. A viewport setting by itself does not reproduce every characteristic of a physical phone or tablet.
Capture multiple websites and sizes with Playwright
The following Node.js example creates a fresh page for every URL-and-viewport pair, sets the viewport before navigation, waits for the page load event, and writes viewport screenshots to a directory. It uses Playwright’s Chromium engine. Install the package and browser first:
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- Install Node.js, then create a project directory and run
npm init -y. - Install Playwright with
npm install playwright. - Install its Chromium browser with
npx playwright install chromium. - Save the script below as
capture.jsand run it withnode capture.js.
const { chromium } = require('playwright');
const fs = require('node:fs/promises');
const urls = [
{ key: 'example', url: 'https://example.com' },
{ key: 'iana', url: 'https://www.iana.org' },
];
const viewports = [
{ width: 1440, height: 900 },
{ width: 390, height: 844 },
];
function safeKey(value) {
return value.toLowerCase().replace(/[^a-z0-9_-]+/g, '-');
}
(async () => {
await fs.mkdir('screenshots', { recursive: true });
const browser = await chromium.launch({ headless: true });
try {
for (const site of urls) {
for (const viewport of viewports) {
const page = await browser.newPage({
viewport: { width: viewport.width, height: viewport.height },
deviceScaleFactor: 1,
});
try {
await page.goto(site.url, {
waitUntil: 'load',
timeout: 60000,
});
const filename = `${safeKey(site.key)}__${viewport.width}x${viewport.height}__viewport.png`;
await page.screenshot({
path: `screenshots/${filename}`,
fullPage: false,
scale: 'css',
});
console.log(`Saved screenshots/${filename}`);
} finally {
await page.close();
}
}
}
} finally {
await browser.close();
}
})().catch(error => {
console.error(error);
process.exitCode = 1;
});Change the sample URLs and site keys to your targets. deviceScaleFactor: 1 and scale: 'css' make the example’s output intent explicit. If you want a full-page image instead, set fullPage: true; that captures the scrollable document rather than just the configured viewport area.
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The example creates pages independently so each URL-and-size capture starts with a separate page state. If you instead create several pages in one browser context, remember that context-level settings apply across its pages; use distinct contexts when you need different context configuration. In either pattern, configure the viewport before navigation so the site can respond to the intended dimensions from its first render.
Make captures reproducible
Record enough information to tell whether a visual difference came from the website or the capture environment. Keep a small manifest beside the images containing:
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- Target URL and viewport width and height.
- Browser engine and version.
- Screenshot scale and whether capture was viewport-only or full-page.
- Capture date, execution environment, and any wait condition or state setup.
Keep the browser version and host environment stable when comparing screenshots over time. Playwright notes that rendering can vary with operating system, browser version, settings, hardware, and headless mode; a pixel difference alone does not prove the site layout changed. Check whether the capture environment changed before treating a visual diff as a regression. See the Playwright snapshot documentation for related guidance on screenshot comparisons.
Handle dynamic content deliberately
Pages may render content after the initial load, including images, ads, animations, and API-driven components. There is no single readiness rule that works for every website. Use a consistent condition suitable for your pages, such as waiting for a known selector, and document it. A fixed delay may be easy to add, but it can be too short on a slow run and unnecessarily long on a fast one.
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The sample processes captures one at a time. That is a sensible starting point: it is easier to debug, uses fewer simultaneous browser resources, and avoids imposing an abrupt burst of requests on the target sites. For a large matrix, you can introduce limited concurrency after confirming that your machine and the sites handle it reliably. Keep the number of simultaneous pages bounded; launching every URL-size pair at once can consume substantial memory and create unnecessary load.
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For repeat runs, keep the input URL and viewport lists in a stable order, retain the manifest, and write output to a predictable directory. If you need to compare changed images, ensure both runs use the same viewport, scale, browser version, wait condition, and host setup. Treat dynamic advertisements or personalized content as sources of variation rather than automatically as layout changes.
Troubleshoot failed or inconsistent captures
- Screenshot uses the wrong responsive layout: Set the viewport before calling
page.goto(), then make sure the intended width and height are being passed for that matrix row. - Navigation times out: Check that the URL is reachable from the machine running the script. Some pages keep network requests open or load slowly; choose a readiness condition appropriate to the page rather than assuming one wait setting fits every site. Raise the timeout only when a longer navigation is genuinely expected.
- Page is blank or incomplete: Inspect whether navigation returned an error, whether the site requires authentication or consent, or whether content appears only after an interaction or delayed load. Add the necessary setup and a documented wait condition.
- Images or below-the-fold content are missing: A viewport capture does not include the entire page, and content that loads only while scrolling may not yet exist. Use full-page capture when the goal is whole-page documentation and verify that lazy-loaded content has had a chance to load.
- Images differ between repeat runs: Compare browser version, operating system, headless mode, scale, hardware, and dynamic page state. Keep the environment stable before interpreting pixel differences as product changes.
- Output is unexpectedly large: Check whether device-pixel scale or a high device scale factor is in use. CSS scale may be more suitable when the comparison should use one output pixel per CSS pixel.
- One site blocks or limits repeated requests: Reduce concurrency and capture frequency, and follow the target site’s access rules. A browser automation script does not guarantee that every site will permit automated access.
Or skip the browser setup
For a hosted capture instead of maintaining a local browser, ScreenshotNeo accepts one GET request with a URL and returns a screenshot or PDF. Its many options include viewport dimensions and device presets, full-page capture, output formats, and bulk capture of up to 100 URLs per call. Cookie banners, newsletter popups, and chat widgets are removed before the shot; bot checks, blank pages, timeouts, and failed loads are not billed, and cache hits cost nothing. An MCP server exposes screenshot tools to Claude, Cursor, and other MCP clients.
For a single capture, this cURL command saves a WebP screenshot:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpSee the ScreenshotNeo API documentation for the request parameters, including viewport controls, and adapt the URL for your target. ScreenshotNeo’s Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.
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FAQ
Should I use a new browser for every screenshot?
No. A single browser can host multiple pages. The important part for this workflow is setting the right viewport on each page before navigating and keeping page state appropriately isolated.
Does a screenshot at a mobile width prove how a real phone will render?
No. A viewport tests responsive layout at that width, but does not by itself emulate all physical-device properties. Use device emulation when screen, user agent, or touch configuration matters.
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