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To capture a mobile-style screenshot with PhantomJS, set page.viewportSize before opening the page, optionally set a mobile user-agent string, check the page.open() status, and call page.render() after the page is ready. For an exact fixed-size image, set page.clipRect as well. This emulates a browser viewport; it is not a capture from a physical phone.
PhantomJS uses WebKit to render pages, but its official project page says development is suspended until further notice. Treat it as a legacy option, particularly when capturing modern sites. PhantomJS project page.
Capture a mobile viewport with PhantomJS
The essential order matters: configure the viewport and any user agent before navigation, then render from the successful page-open callback. Save this as mobile-screenshot.js:
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesvar page = require('webpage').create();
page.viewportSize = { width: 375, height: 667 };
page.settings.userAgent =
'Mozilla/5.0 (iPhone; CPU iPhone OS 13_2 like Mac OS X) ' +
'AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 ' +
'Mobile/15E148 Safari/604.1';
page.open('https://example.com/', function (status) {
if (status !== 'success') {
console.log('Unable to access network');
phantom.exit();
return;
}
page.render('mobile-375x667.png');
phantom.exit();
});Run it with:
phantomjs mobile-screenshot.jsOn success, PhantomJS writes mobile-375x667.png in the current working directory. The basic sequence follows the official screen-capture examples: create a webpage, open a URL, render the page, and exit. PhantomJS screen capture guide.
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Choose the viewport before opening the URL
page.viewportSize sets the emulated browser window in CSS pixels and influences responsive layout. A viewport of 375 by 667 pixels is one narrow-phone example; 390 by 844 is another larger-phone example. These are viewport dimensions, not guarantees of a match to a specific physical device. The site may respond to other signals, and the screenshot does not reproduce the device’s hardware, operating system, browser chrome, or pixel density.
Set a user agent only if the site needs one
The mobile user-agent string in the script is optional. It can influence server-side responses or page scripts that branch on browser identity, but changing it does not turn PhantomJS into a real iPhone browser. Set page.settings.userAgent before page.open(); the setting API describes these settings as applying during the initial open call. PhantomJS WebPage settings API.
Check the open status before rendering
The callback’s status should be success before the script writes an image. The failure message in the example is deliberately broad: a failed open can indicate a network or page-load problem, and the callback alone does not provide a full diagnosis. Do not treat the existence of an output file as proof that the intended page loaded correctly.
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Crop to an exact screenshot rectangle
page.viewportSize controls the browser window used for layout; page.clipRect chooses the rectangle included in the screenshot. For a fixed 375-by-667 output area, add this before page.open():
page.clipRect = { top: 0, left: 0, width: 375, height: 667 };Set the clip dimensions to the target rectangle you need. A clip can make the image output a fixed size, but it does not change the page’s responsive breakpoint: that is determined by the viewport. The official automation reference defines clipRect as the part of the screen taken in the screenshot. PhantomJS clipRect reference.
If you omit clipRect, page.render() captures the rendered page area according to PhantomJS’s normal behavior. Use a clip when a fixed screenshot canvas is important; omit it when you want the page-area capture rather than an explicitly bounded rectangle.
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Wait for content that loads after navigation
A successful page.open() callback does not establish that every application-specific asynchronous task has finished. A page may render its shell first and fetch images, results, or other content afterward. If the screenshot is taken too early, the file can be valid while visible content is missing.
Use a deliberate delay when the page has a known settling time
For a page whose content appears shortly after navigation, delay the render in the successful callback. For example, replace the render-and-exit lines with:
window.setTimeout(function () {
page.render('mobile-375x667.png');
phantom.exit();
}, 1500);The 1,500-millisecond delay is an example, not a universal readiness guarantee. Choose a delay based on the page’s behavior, and avoid long waits when a specific readiness condition can be checked instead.
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Prefer a page-specific readiness check when possible
If the page exposes a stable element or JavaScript state that appears only when the needed content is ready, poll for that condition from the page context and render once it is true. The correct condition depends on the site; PhantomJS’s basic capture example does not promise that an arbitrary page’s own asynchronous work has completed. Set a finite timeout in any polling logic and exit without pretending the capture is complete if the condition never arrives.
Choose the output format and quality
page.render(filename) infers its format from the filename extension. PhantomJS documentation lists PNG, JPEG, BMP, PPM, GIF (depending on the build), and PDF. PhantomJS render method.
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| JPEG | When a smaller photographic-style image is more important than lossless edges. | JPEG quality is an integer from 0 to 100; higher or lower values change the quality/size trade-off. |
| BMP, PPM, GIF | When a downstream workflow specifically accepts one of these formats. | The guide lists these formats; GIF availability depends on the build. |
| When the output should be a document rather than a raster image. | PDF is among the formats listed by the render documentation. |
For the common screenshot case, use a .png filename for detail, or a .jpg filename when you need JPEG output. Do not assume every PhantomJS build supports every listed format, especially build-dependent GIF support.
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Understand the limits of mobile emulation
PhantomJS’s viewport and user-agent settings let you test responsive layout and pages that vary by browser identity. They do not establish that the page behaves as it would on a real device. A physical phone can differ in browser engine, operating-system behavior, touch interaction, font rendering, device pixel ratio, and available APIs. PhantomJS’s renderer is WebKit, and the project status makes it a legacy capture choice rather than a maintained path for new browser coverage. The official project page says development is suspended until further notice. PhantomJS project page.
For repeatable legacy capture jobs, pin the PhantomJS runtime used by your build and keep the script and expected output format together. Modern web features or TLS behavior may differ from current browsers; if the target requires current browser compatibility, use a maintained browser automation tool instead. This is an engineering recommendation based on PhantomJS’s stated project status, not a promise about any particular replacement.
Troubleshoot common capture problems
- The script reports “Unable to access network.” The open callback did not report success. Check the URL, network access, and whether the target is reachable from the machine running PhantomJS; render only after a successful open.
- The image has a desktop layout. Confirm that
page.viewportSizeis assigned beforepage.open(). If the site serves different markup based on browser identity, set the user agent before navigation too. - The image is the wrong size. Separate the two controls: set
viewportSizefor responsive layout andclipRectfor the screenshot rectangle. Check both width and height, and ensure the clip begins at the intended top and left coordinates. - Content is missing or still loading. The page may perform asynchronous work after the open callback. Add a page-appropriate delay or wait for a specific readiness condition before calling
page.render(). - The result differs from an iPhone screenshot. The script emulates a viewport and can send a mobile user agent, but it does not capture a physical iPhone or reproduce every device-specific rendering behavior.
- The chosen extension produces an unexpected result. Confirm the filename extension and the formats supported by the installed build. GIF support is build-dependent; the render API documentation lists the supported output types and quality behavior.
- A modern site fails despite a correct script. PhantomJS development is suspended, so its engine and TLS behavior may not match current browsers. Test whether the same page requires newer browser capabilities, and use maintained browser automation for new compatibility work.
Or skip the browser setup
ScreenshotNeo provides a website screenshot API and MCP server. One GET request can return a PNG, JPEG, WebP, or PDF. For example, save this as a cURL command, replacing the example URL with the page to capture:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. The corresponding Python example is:
import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90,
)
open("shot.webp", "wb").write(r.content)And in Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo accepts cookie and consent banners as a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers identify the page verdict and whether the request was billed. Its MCP server offers take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 screenshots. Sign up free for 1,000 screenshots a month, with no card required.
Frequently Asked Questions
Does changing the user agent make PhantomJS a real mobile browser?
No. It changes the browser identity string sent with the request; the capture still uses PhantomJS and its WebKit renderer.
Can PhantomJS capture a page as a PDF?
Yes. The render documentation lists PDF among the supported output formats; use a PDF filename extension and confirm support in the installed build.
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