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For an automated screenshot of a website rendered at phone dimensions, use Puppeteer: emulate a device before opening the URL, then capture a screenshot. If you mean recording the browser window the visitor is looking at, use the Screen Capture API instead; it requires a user gesture and permission. These are different jobs, and neither desktop emulation nor browser display capture proves that a site works correctly on a physical phone.
Choose what “capture a mobile website” means
There are two common interpretations:
- Capture a URL as a mobile-sized page for QA, documentation, or visual regression: run browser automation with a chosen mobile device profile. Puppeteer can set the viewport metrics and user agent, navigate to the page, and save a screenshot or recording.
- Record the browser surface a person is viewing: ask the person to choose a display or portion of one, then record the returned media stream. JavaScript in an ordinary webpage cannot silently take a screenshot of arbitrary browser content.
Use the first method for repeatable captures of URLs. Use the second only when a person should explicitly share their screen. For final checks of device-dependent behavior, test on an actual phone or use remote debugging.
Capture a mobile-rendered URL with Puppeteer
Puppeteer automates a browser for tasks including screenshots, navigation, and UI interaction. Its device emulation is applied to a browser page; it does not turn the desktop browser process into a physical phone. The essential order is to emulate first and navigate second: the emulation changes the page size, and applying it before navigation avoids starting the visit at the wrong metrics. See the Puppeteer page.emulate() documentation and Chrome for Developers’ Puppeteer overview.
Install and run a screenshot script
In a new Node.js project, install Puppeteer, which downloads a compatible Chrome for Testing browser as part of its usual installation:
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npm install puppeteerSave the following as capture-mobile.mjs and run it with node capture-mobile.mjs. The example uses Puppeteer’s current documented KnownDevices entry for “iPhone 17 Pro.” Device names and APIs can change, so check the installed Puppeteer version if that profile is unavailable.
import puppeteer, { KnownDevices } from "puppeteer";
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.emulate(KnownDevices["iPhone 17 Pro"]);
await page.goto("https://example.com", { waitUntil: "networkidle2" });
await page.screenshot({ path: "mobile.png", fullPage: true });
} finally {
await browser.close();
}The resulting mobile.png is a static, full-page screenshot. Change the URL and output path to suit your task. fullPage: true captures the full document rather than just the currently visible viewport; omit it when you want a viewport-only image.
Wait for the state you want to document
networkidle2 waits for a period with no more than two active network connections, but it is not a guarantee that all visible content has finished changing. Analytics, polling, lazy-loaded images, animations, and client-side rendering can make network-idle behavior misleading. For a page with a known ready signal, wait for it explicitly after navigation:
await page.goto("https://example.com", { waitUntil: "domcontentloaded" });
await page.waitForSelector("main[data-ready='true']");
await page.screenshot({ path: "mobile.png", fullPage: true });Replace the selector with an element or state that actually means your target page is ready. If the content appears only after scrolling, scroll through the page before taking a full-page capture so lazy-loaded elements have an opportunity to load. A fixed delay can be used when no reliable readiness signal exists, but it is less robust than waiting for a specific condition.
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Record a mobile-emulated interaction
For a motion capture, Puppeteer’s page.screencast() returns a recorder. Current Puppeteer documentation says recordings default to WebM with VP9 at 30 FPS and require FFmpeg. Navigate and perform the flow you intend to record before stopping the recorder:
const recorder = await page.screencast({ path: "mobile.webm" });
// Interact with the page or run the flow you want to document.
await recorder.stop();Use a screenshot when a still image is enough; a recording adds a dependency and produces a larger moving artifact. Check the Puppeteer screencast documentation for requirements and behavior for your installed version.
Record the visible browser surface with JavaScript
If your webpage should let a visitor record a screen or browser tab, call navigator.mediaDevices.getDisplayMedia() in response to a click. The browser prompts the user to select a surface and returns a MediaStream if permission is granted. This API requires a secure context, such as HTTPS, and is not supported in every browser. Surface selection and audio behavior vary by browser. See MDN’s getDisplayMedia() reference.
This example records video without audio, downloads the recording when it stops, and stops when the user ends sharing:
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<button id="start">Choose a screen to record</button>
<script>
const button = document.querySelector("#start");
button.addEventListener("click", async () => {
let stream;
try {
if (!navigator.mediaDevices?.getDisplayMedia) {
throw new Error("Screen capture is not available in this browser.");
}
stream = await navigator.mediaDevices.getDisplayMedia({
video: { displaySurface: "browser" },
audio: false
});
const recorder = new MediaRecorder(stream);
const chunks = [];
recorder.addEventListener("dataavailable", (event) => {
if (event.data.size) chunks.push(event.data);
});
recorder.addEventListener("stop", () => {
const blob = new Blob(chunks, { type: recorder.mimeType || "video/webm" });
const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = "mobile-capture.webm";
link.click();
setTimeout(() => URL.revokeObjectURL(url), 1000);
stream.getTracks().forEach((track) => track.stop());
}, { once: true });
stream.getVideoTracks()[0].addEventListener("ended", () => {
if (recorder.state !== "inactive") recorder.stop();
}, { once: true });
recorder.start();
} catch (error) {
console.error("Capture was cancelled or unavailable", error);
if (stream) stream.getTracks().forEach((track) => track.stop());
}
});
</script>The browser may reject a request, the user may cancel the picker, or the user may stop sharing. Treat those as normal outcomes, not as a reason to try to capture without consent. If you need audio or a different surface, check the target browsers’ supported options and test them directly; do not assume a requested surface or audio track will be available everywhere. The returned stream can also be sent over WebRTC instead of recorded locally.
Emulation is not the same as testing on a phone
Desktop device emulation is useful because it is fast and scriptable, but its viewport and user-agent settings are simulations. Microsoft Edge describes Device Emulation as a “first-order approximation” and says it “doesn’t actually run your code on a mobile device.” For the most robust testing, Edge recommends running the page on a mobile device. Read Microsoft Edge’s Device Emulation documentation.
| Check | Desktop device emulation | Real device or remote debugging |
|---|---|---|
| Setup and repeatability | Fast and scriptable for repeatable screenshot runs. | Requires a connected device or access to a remote device. |
| Viewport and user agent | Simulated through the selected profile. | Uses the target device’s native values. |
| CPU, browser engine, sensors, permissions | Approximate or absent; does not reproduce every device behavior. | Lets you observe behavior on the target device and browser. |
| Best fit | Broad screenshot and visual regression checks. | Final compatibility, input, permission, and performance checks. |
Use emulation to catch layout changes across profiles, then verify issues involving touch input, OS permissions, sensors, fonts, browser engines, or performance on the relevant physical device. A screenshot alone cannot establish that a mobile interaction works.
Or skip the browser setup
If your goal is a URL screenshot rather than browser automation practice, ScreenshotNeo is a website screenshot API and MCP server. One GET request returns a PNG, JPEG, WebP, or PDF. For example, save the response as WebP with cURL:
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting capture failures
Puppeteer reports that the device profile is undefined
The installed Puppeteer version may not include the named profile, or the profile name may not match exactly. Check the KnownDevices entries available in that version and use a supported name. Keep the Puppeteer version pinned or reviewed in automated pipelines so a dependency update does not silently change the profile or API behavior.
The screenshot is blank or misses late content
Navigation completion and network idle do not always mean that a single-page app has rendered its final view. Wait for a page-specific selector or readiness state, and check that the target element is visible before capturing. If images load as the visitor scrolls, scroll through the page before the full-page screenshot.
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Emulation does not reproduce every mobile CPU, browser engine, permission, sensor, font, or hardware characteristic. Use remote debugging or test on the actual phone and browser when the behavior depends on one of those features.
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getDisplayMedia() rejects or the chooser does not appear
Confirm the page is served from a secure context and invoke the API directly from a user action such as a button click. Check that the browser supports the API, then handle permission denial or cancellation in the rejected promise. You cannot bypass the user’s choice.
The screen recording will not start or download
Check that the browser supports MediaRecorder and that the selected capture produced a video track. Wait for the recorder’s stop event before building the download, because encoded chunks arrive asynchronously. Revoke the object URL only after initiating the download, and stop the stream’s tracks when recording ends.
Puppeteer screencast fails to record
Verify FFmpeg is available as required by the current Puppeteer screencast documentation. Also confirm the browser process remains open while recording and that the recorder is stopped before closing the browser.
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Privacy, reliability, and cost considerations
- Protect captured data: screenshots and recordings can contain anything visible to the browser session, including account information and secrets. Use a test account and avoid exposing private data in saved artifacts or logs.
- Make automated runs reproducible: pin or review Puppeteer versions, use explicit device profiles and readiness conditions, and keep output names predictable. Network idle alone may be unreliable on pages with persistent connections or dynamic rendering.
- Account for the browser environment: local Puppeteer captures depend on browser installation, available memory, network access, and any dependencies required for recording. A failed load should not be mistaken for a valid screenshot.
- Choose capture scope intentionally: full-page images can be much taller and larger than a viewport capture. Prefer the smallest artifact that answers the QA or documentation question.
- Know what you pay for: self-hosted Puppeteer has no per-shot API charge, but it uses your own compute and maintenance time. A hosted API trades setup for a service plan; for ScreenshotNeo specifically, the listed free allowance is 1,000 shots per month and the lowest paid plan is $5 for 3,000.
Frequently Asked Questions
Can JavaScript take a screenshot of a visitor’s phone screen without asking?
No. The Screen Capture API requires the browser’s surface picker and user permission; a webpage cannot silently capture the visitor’s display.
Does Puppeteer’s phone profile run a real iPhone browser?
No. It applies emulated device metrics and a user agent in a browser process; use an actual device or remote debugging for device-specific verification.
Can I use Puppeteer for a video instead of a still image?
Yes. Puppeteer’s screencast API records browser activity to WebM by default, and the current documentation says FFmpeg is required.
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