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To capture a webpage with PhantomJS in Docker, write a JavaScript script that opens the URL and calls page.render(), then run that script inside a PhantomJS container with the output directory mounted to the host. Set viewportSize for the browser window and clipRect if you need to crop the result. The important caveat: PhantomJS development is suspended, its upstream repository is archived, and the commonly surfaced wernight/phantomjs image is old. Treat this as a legacy workflow and verify image availability and compatibility before relying on it. PhantomJS Archived repository Docker Hub image
Write a PhantomJS screenshot script
Save this as capture.js. Replace the example URL if needed. The script sets a 1024 × 768 browser viewport, opens the page, writes a PNG, and exits after the page-open callback runs.
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var page = require('webpage').create();
page.viewportSize = { width: 1024, height: 768 };
page.open('https://example.com/', function (status) {
if (status !== 'success') {
console.log('Unable to load the page');
phantom.exit(1);
return;
}
page.render('/output/capture.png');
phantom.exit();
});The status check gives a nonzero exit when PhantomJS reports that it could not open the page. It does not guarantee that a site has finished all client-side rendering or that every image has loaded; PhantomJS’s documented basic pattern is to render after page.open calls back. See the PhantomJS screen-capture guide.
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First check that the image tag exists for your platform and that it can run in your environment. Docker Hub’s wernight/phantomjs listing shows a 2.1.1 tag and Docker usage examples, but the listing says it was updated almost six years ago. The following command illustrates the bind mount and working-directory arrangement; it is not a claim that the old image is currently available or compatible on every host.
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Create a local directory for the script and output, for example
phantom-job, and placecapture.jsinside it. -
Run the container with that directory mounted at
/output:docker run --rm -v "$PWD/phantom-job:/output" -w /output wernight/phantomjs:2.1.1 phantomjs capture.js -
After a successful run, look for
capture.pngin the host’sphantom-jobdirectory. If your verified image uses a different tag or command layout, adjust the image reference or invocation accordingly.Do these 3 things before closing this tab:
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The Docker Hub listing documents the image and tags, but the exact mount path and working-directory arrangement above are tailored to this example. Check the image listing before using it, especially on a different CPU architecture or with a custom build.
Choose the viewport, crop, and output format
Viewport and clipping are different
page.viewportSize sets the headless browser’s viewport dimensions, which affect layout and responsive breakpoints. page.clipRect selects a rectangle of the rendered page to capture; it does not set the viewport. For example, add this before opening the page to capture a 600 × 400 rectangle starting at the top-left:
page.clipRect = { top: 0, left: 0, width: 600, height: 400 };Choose viewport dimensions that match the layout you need, then use clipping only when the output should be restricted to a particular region. Both settings are documented in the screen-capture guide.
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File extension determines the format
PhantomJS selects the render format from the output filename extension. The render API documentation lists PDF, PNG, JPEG, BMP, and PPM; GIF depends on the Qt build. For instance, use page.render('/output/capture.jpg') for JPEG. An extension does not establish that every format will work in every build, so verify the result with the image or document tools in your environment.
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The PhantomJS FAQ says the rendered output can have a transparent background when the page does not set one. If you need an opaque background, set one deliberately in the page or script and check the resulting file. The FAQ also says PhantomJS versions 1.5 and later are pure headless and do not require X11 or Xvfb. PhantomJS FAQ
Know the legacy and security trade-offs
The PhantomJS project website says development is suspended, and GitHub marks the upstream repository archived and read-only; GitHub gives the archive date as May 30, 2023. The repository describes 2.1 as the latest stable release. The Docker Hub image’s stale update status adds a separate maintenance concern: old browser code and an old container image may not suit current security or platform requirements. Project notice Repository status Image listing
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Keep this setup only when its legacy rendering behavior is necessary and its compatibility is acceptable for your workload. Before adopting it, verify the image tag, CPU architecture, Docker invocation, and output on the actual host. The documentation and registry listing establish the historical workflow, not a successful current build or screenshot test.
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-
Docker cannot find the image or tag: the image or tag may no longer be available, or the tag may not support your platform. Check the current Docker Hub listing, then use a verified image and tag rather than assuming the example remains available.
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The script is not found: confirm
capture.jsis inside the mounted host directory, that the mount destination is/output, and that the container working directory is set to/output. Update either the command or script path if your invocation differs.Best Value
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No screenshot appears on the host: ensure
page.render()writes under the mounted directory, as in/output/capture.png, and inspect the container’s exit status and output. A file written elsewhere inside the container will not appear in the host directory. -
The output is cropped or the layout is unexpected: check
viewportSizefirst, then verify whetherclipRectrestricts the image. They control different things: viewport dimensions and the captured rectangle. -
The page looks incomplete: the documented basic callback pattern renders after the page-open callback, but a page may require additional time or interaction for client-side content. PhantomJS is suspended, so do not assume current websites will render correctly; confirm that this legacy engine meets the page’s needs.
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HTTPS certificate errors: PhantomJS’s CLI documentation lists
--ignore-ssl-errorswith a default of false. Disabling certificate checks weakens validation and should not be treated as a routine fix. Diagnose the certificate or trust configuration instead. Command-line documentation
Or skip the browser setup
ScreenshotNeo takes a screenshot through one GET request, returning PNG, JPEG, WebP, or PDF. For example, this cURL call saves a WebP capture of the target URL:
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 options. Cookie and consent banners are accepted like a visitor and removed along with more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response reports the page verdict and billing status in headers. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. 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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