To bulk screenshot web pages in Docker, run a Playwright script in a container, read URLs from an input list, and save a screenshot for each page with page.screenshot(). Pin the Playwright Docker image to the same version as the Playwright package in your project: the image supplies browser binaries and system dependencies, but not the package itself.
Set up a version-matched Playwright container
Use the official Playwright Docker image for the browser executables and operating-system dependencies, then install Playwright in your project. Keep the image tag and package version aligned; a mismatch can prevent Playwright from finding its browser executable. Pin a specific image version for repeatable runs rather than relying on a moving tag. See the Playwright Docker documentation for current image tags and setup details.
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The Docker documentation’s next set showed v1.63.0 tags when reviewed, but that is a time-sensitive example, not a recommendation to use that version now. Choose a currently available tag that matches your installed package.
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Example project files
This example uses Node.js. Put the matching Playwright package version in package.json, and substitute the same version in the Docker image tag:
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{
"private": true,
"scripts": { "screenshots": "node capture.js" },
"dependencies": { "playwright": "<MATCHING_VERSION>" }
}Build a small image on top of the matching official image:
FROM mcr.microsoft.com/playwright:<MATCHING_VERSION>-noble
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY capture.js urls.txt ./
CMD ["npm", "run", "screenshots"]Replace <MATCHING_VERSION> with a real, pinned version before building. The exact tag suffix depends on the published image; check the official Docker page. If your project already has a lockfile, copy it and use the package manager’s lockfile-based install command so repeated builds resolve the same dependencies.
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Capture a list of URLs
Place one URL per line in urls.txt. This script visits them sequentially, saves viewport screenshots in a dedicated output directory, and writes navigation or capture failures to standard error without abandoning the remaining URLs.
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const fs = require('node:fs/promises');
const path = require('node:path');
const { chromium } = require('playwright');
async function main() {
const urls = (await fs.readFile('urls.txt', 'utf8'))
.split(/r?n/)
.map((line) => line.trim())
.filter((line) => line && !line.startsWith('#'));
await fs.mkdir('screenshots', { recursive: true });
const browser = await chromium.launch();
const page = await browser.newPage();
const failures = [];
try {
for (let i = 0; i < urls.length; i++) {
const url = urls[i];
const filename = `${String(i + 1).padStart(4, '0')}.png`;
const outputPath = path.join('screenshots', filename);
try {
const response = await page.goto(url, {
waitUntil: 'load',
timeout: 30000
});
if (!response) {
throw new Error('Navigation did not return a main-resource response');
}
if (!response.ok()) {
throw new Error(`HTTP ${response.status()}`);
}
await page.screenshot({ path: outputPath });
process.stdout.write(`Saved ${outputPath} <- ${url}n`);
} catch (error) {
failures.push({ url, error: String(error) });
process.stderr.write(`Failed ${url}: ${error}n`);
}
}
} finally {
await browser.close();
}
await fs.writeFile('screenshots/failures.json', JSON.stringify(failures, null, 2));
if (failures.length) process.exitCode = 1;
}
main().catch((error) => {
process.stderr.write(`${error.stack || error}n`);
process.exitCode = 1;
});The output filenames are list indexes rather than URL-derived names. This avoids unsafe path characters and collisions when distinct URLs normalize to similar strings; keep the input list alongside the output or log, as above, to map each index back to its URL.
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Build, run, and retrieve the files
- Build the image with a matching pinned version:
docker build -t bulk-capture . - Run it with a host directory mounted for results:
mkdir -p output && docker run --rm -v "$PWD/output:/app/screenshots" bulk-capture - Read the PNG files and
failures.jsonfrom the host’soutputdirectory. A nonzero container exit status means at least one URL failed, while successful captures remain available.
To change the input list without rebuilding, mount it into the container as /app/urls.txt, for example by adding -v "$PWD/urls.txt:/app/urls.txt:ro" to the run command.
Choose viewport or full-page capture
| Scope | Playwright option | Use it when | Trade-off |
|---|---|---|---|
| Viewport | page.screenshot({ path: outputPath }) |
You need the visible screen at the configured viewport size. | Content below the fold is not included. |
| Full page | page.screenshot({ path: outputPath, fullPage: true }) |
You need the full scrollable document in one image. | The resulting image can be much taller and require more storage or downstream processing. |
Playwright also supports output format and screenshot options such as the output path and image format; consult the screenshot documentation for the current option set. Select a format your downstream system accepts, and account for the dimensions and storage needs of full-page images.
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Make bulk runs dependable
Use deterministic inputs and record failures
- Keep a stable URL list and use predictable output names so later runs can be compared or resumed.
- Record the URL, failure reason, and output filename for each result. The sample writes failures to JSON and continues through the list.
- Decide how to handle HTTP error responses. The example records non-success main-resource responses as failures; remove that check if you intentionally need screenshots of error pages.
Wait for the state your capture needs
The example waits for the page load event, which is a practical baseline rather than a guarantee that every dynamic page is visually settled. Sites that render important content later may need an explicit wait for a known selector or an intentional delay before the screenshot. Conversely, waiting indefinitely for all network activity can be unsuitable for pages with persistent requests. Pick a wait condition based on the target pages and test it against representative URLs.
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Browser rendering can vary with operating system, browser version, settings, hardware, power source, and headless mode. Generate baseline and comparison screenshots in the same container image and configuration to reduce environment-driven differences. See Playwright’s visual comparison guidance.
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Scale concurrency by measurement
The Playwright documentation cited here does not prescribe a universal concurrency, retry, or rate setting for bulk capture. Sequential processing is the simplest starting point. If the list is large, measure runtime and memory with your own pages and container limits before introducing multiple pages or workers. Respect the destination sites’ access rules; more parallel navigation is not automatically faster or appropriate.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common failures
- Playwright cannot find a browser executable: align the package version with the Docker image tag, then rebuild the image. The image provides browsers and system dependencies, not the Playwright package.
- A URL times out: check that the container can reach the site and that the URL is correct. For slow pages, adjust the navigation timeout deliberately; if content arrives after the load event, wait for the page element needed for the capture.
- No screenshot appears for a URL: inspect
failures.jsonand container logs. Confirm that the output directory is writable and that the host mount points to the expected path. - The screenshot is blank or incomplete: verify the page loaded the content you expect before capture. Dynamic rendering may require a selector-specific wait; full-page mode includes scrollable document content but does not itself ensure delayed content has loaded.
- Images differ between runs: confirm both runs use the same pinned image, browser settings, viewport, and headless configuration. Changes in rendering environment can alter the result.
- A page is blocked or shows a bot check: the site may restrict automated access. Do not attempt to bypass its access controls; follow the site’s terms and access rules.
Or skip the browser setup
ScreenshotNeo offers a screenshot API and MCP server if you prefer not to manage a Playwright container. Its API can return a screenshot in PNG, JPEG, or WebP, or a PDF. For a single URL, make a GET request (the API parameters also support names used by other screenshot APIs, which can ease a switch):
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 options and response details. Cookie banners are accepted and more than 60 known consent platforms, newsletter popups, and chat widgets are removed before capture; these steps can each be turned off. Bot checks/CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its 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.
Sign up for ScreenshotNeo’s free plan to try 1,000 screenshots a month without a card.
Frequently Asked Questions
Does the Playwright Docker image include the Playwright package?
No. It includes browser executables and system dependencies; install the Playwright package in your project separately.
Can I save the whole page instead of only what is visible?
Yes. Set fullPage: true in the options passed to page.screenshot().
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