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For a straightforward batch, feed URLs to Chrome’s headless command-line mode and give every screenshot a unique filename. Use Puppeteer or Playwright when you need page-specific navigation, readiness checks, full-page captures, or element screenshots. The key to a dependable run is to define what counts as “ready,” record each URL’s outcome, and benchmark concurrency on your own pages and machine: official documentation does not establish a universal throughput or concurrency target.
Choose the capture method
| Need | Approach | Decision point |
|---|---|---|
| Simple URL-by-URL capture | Chrome Headless CLI with --screenshot and --window-size. The default filename shown in Chrome’s documentation is screenshot.png in the current working directory. Chrome Headless command-line reference |
Use a script to assign a distinct output path for each URL; otherwise the default name risks replacing earlier captures. |
| Scripted navigation and screenshot control | Puppeteer’s Page.screenshot() and ElementHandle.screenshot(). Puppeteer screenshots |
Useful when the job needs browser-control logic beyond opening a URL. |
| Viewport, element, or full scrollable page | Playwright screenshot APIs, including full-page capture. Playwright screenshots | Choose the capture area and pixel scale before the batch; full-page images can be much larger than viewport images. |
Prepare the batch
- Make a URL list. Keep one URL per line in a text file, for example
urls.txt. Validate the list and decide how to handle duplicate URLs before capturing. - Choose consistent output settings. Set a viewport size and image format that fit the job. A viewport screenshot and a full-page screenshot are different outputs; confirm that downstream storage and image-processing systems can accept the resulting dimensions.
- Choose unique names. Use a stable index or a sanitized URL-derived name. Do not use the same fixed output filename for every page.
- Define readiness. A page loading event or a fixed wait does not prove that delayed or dynamic content has appeared. Test the readiness policy on representative pages.
- Check permission and request rates. Browser screenshot documentation does not establish site-specific permission, acceptable request rates, or legal rules for capturing third-party pages. Check the relevant site terms and applicable rules.
Capture pages with Chrome Headless CLI
Chrome’s --screenshot flag captures the target URL. --window-size sets the requested viewport dimensions. The documented default output name is screenshot.png, so use a different output path for every URL in a batch. Consult the Chrome Headless command-line reference for the command-line options supported by your Chrome version.
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Capture one page
Replace the URL with a page you are authorized to capture. This example requests a 1440-by-1000 viewport and names the result explicitly:
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Run a URL list without overwriting files
This shell example reads urls.txt, numbers outputs, and writes a simple success or failure record. It is sequential; it deliberately does not assume a safe universal parallelism level.
mkdir -p shots
: > results.tsv
i=0
while IFS= read -r url || [ -n "$url" ]; do
[ -z "$url" ] && continue
i=$((i + 1))
output=$(printf 'shots/%05d.png' "$i")
if chrome --headless --screenshot="$output" --window-size=1440,1000 --timeout=20000 "$url"; then
printf '%st%st%sn' "$i" "ok" "$url" >> results.tsv
else
printf '%st%st%sn' "$i" "failed" "$url" >> results.tsv
fi
done < urls.txtHere, --timeout=20000 is a user-chosen maximum wait in milliseconds, not a guarantee that the page finished loading. Chrome’s timeout permits capture to continue after the maximum wait even if loading is still in progress. Adjust it after inspecting representative results; the cited documentation does not establish a universally correct timeout.
Use Puppeteer or Playwright for more control
Choose a browser automation library when each page needs navigation logic, a chosen capture mode, or other scripted actions. These examples illustrate the screenshot calls and use a URL list, unique output names, and per-URL outcome records. Install the selected library according to its official documentation before running them.
Puppeteer: viewport screenshot per URL
Puppeteer documents Page.screenshot() for a page and ElementHandle.screenshot() for an element. See Puppeteer’s screenshot guide.
const fs = require('node:fs/promises');
const puppeteer = require('puppeteer');
async function main() {
const urls = (await fs.readFile('urls.txt', 'utf8'))
.split(/r?n/)
.map((url) => url.trim())
.filter(Boolean);
const browser = await puppeteer.launch({ headless: true });
const results = [];
try {
const page = await browser.newPage({ viewport: { width: 1440, height: 1000 } });
for (let i = 0; i < urls.length; i += 1) {
const url = urls[i];
const output = `shots/${String(i + 1).padStart(5, '0')}.png`;
try {
await page.goto(url, { waitUntil: 'networkidle2', timeout: 30000 });
await page.screenshot({ path: output });
results.push({ url, status: 'ok', output });
} catch (error) {
results.push({ url, status: 'failed', error: String(error) });
}
}
} finally {
await browser.close();
await fs.writeFile('results.json', JSON.stringify(results, null, 2));
}
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});Create the shots directory before running the script. Puppeteer’s documented example uses waitUntil: 'networkidle2', but that is not proof that every arbitrary page’s late-loading content is complete. Verify results on pages with dynamic content and adapt the readiness condition to what the page actually needs.
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Playwright: viewport or full-page screenshot
Playwright supports viewport, element, and full-page screenshots; full-page mode captures the full scrollable page. See Playwright’s screenshot documentation.
const fs = require('node:fs/promises');
const { chromium } = require('playwright');
async function main() {
const urls = (await fs.readFile('urls.txt', 'utf8'))
.split(/r?n/)
.map((url) => url.trim())
.filter(Boolean);
const browser = await chromium.launch({ headless: true });
const results = [];
try {
const page = await browser.newPage({ viewport: { width: 1440, height: 1000 } });
for (let i = 0; i < urls.length; i += 1) {
const url = urls[i];
const output = `shots/${String(i + 1).padStart(5, '0')}.png`;
try {
await page.goto(url, { waitUntil: 'load', timeout: 30000 });
await page.screenshot({ path: output, fullPage: true });
results.push({ url, status: 'ok', output });
} catch (error) {
results.push({ url, status: 'failed', error: String(error) });
}
}
} finally {
await browser.close();
await fs.writeFile('results.json', JSON.stringify(results, null, 2));
}
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});To capture only the viewport, omit fullPage: true. For one element, locate it and use the locator’s screenshot method, for example await page.locator('main').screenshot({ path: output });. Confirm that the selector matches the intended element on every target page.
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Viewport, full page, or element
- Viewport: captures the currently visible browser area at the selected viewport dimensions.
- Full page: captures the full scrollable document in Playwright’s full-page mode. It can produce much taller images and larger files than viewport captures.
- Element: captures a selected element, which is useful when only one component matters. A missing or ambiguous selector needs to be handled as an individual page failure.
Loading is not the same as readiness
Chrome’s CLI timeout is a maximum wait, not confirmation that all content has rendered. Puppeteer’s documented networkidle2 example is one possible navigation condition, but neither it nor a fixed delay reliably captures all dynamic content on arbitrary sites. Inspect a sample of pages, especially those with lazy-loaded images, client-side rendering, or content that appears after interaction.
Scale the run without guessing
The official Chrome, Puppeteer, and Playwright materials cited here document capture features, not throughput benchmarks, memory-per-page estimates, or a recommended concurrency for a hundred-page job. Begin with a representative subset on the same machine and runtime you will use for the full batch.
- Run a small sample that includes typical pages and the slowest or most dynamic ones.
- Record duration, output size, timeout rate, failures, and resource use in your environment.
- Increase parallelism cautiously, repeating the sample and comparing the same measures.
- Choose a concurrency level based on observed failures and resource use, then retain per-URL outcomes so failed pages can be retried selectively.
Full-page captures can increase image dimensions and storage requirements, so check downstream limits before launching a large batch. Avoid assuming that a faster run is reliable if it produces missing content or more failures.
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Troubleshoot common batch failures
- Every run seems to produce only one screenshot: the script may reuse
screenshot.png. Give each URL a unique output filename. - Chrome command is not found: the executable may not be on the shell’s path or may have a different name. Invoke the installed executable by its full path.
- Screenshot has missing content: the page may still be loading when capture begins. Adjust the readiness policy or timeout after testing the affected page; a timeout alone does not guarantee completeness.
- Some URLs fail while others work: keep a per-URL result log, inspect the recorded error, and retry only failed inputs rather than discarding successful output.
- Full-page output is too large for the next step: use viewport or element capture when that matches the task, or verify the receiving system’s image and storage limits before recapturing.
- Element screenshot fails or captures the wrong area: verify that the selector exists and identifies the intended element on that page; layouts can differ across URLs.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. One GET request returns a PNG, JPEG, WebP, or PDF, and its API accepts familiar screenshot parameter names to make switching easier. Cookie and consent banners, newsletter popups, and chat widgets can be removed before capture, with each cleanup step optional. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed; response headers report the page verdict and billing status. AI agents can use its MCP server tools, including take_screenshot, get_page_info, and capture_pdf. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots. See the ScreenshotNeo API documentation for parameters and response details.
For example, this cURL request saves a screenshot of one URL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpKeep the key private and replace YOUR_API_KEY with your account key. To capture hundreds of URLs, call the endpoint for each input and preserve a result record per URL so you can identify and retry failures. The API also supports bulk capture of up to 100 URLs per call. Sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Does Chrome Headless guarantee that a page is fully loaded when it takes a screenshot?
No. Its timeout is a maximum wait; capture may proceed while loading continues.
Is there an official recommended concurrency for capturing hundreds of pages?
The cited Chrome, Puppeteer, and Playwright documentation does not establish one. Benchmark your pages and runtime.
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