To make Chrome Headless wait before it captures a page, add the millisecond --timeout flag: chrome --headless --screenshot --timeout=5000 https://example.com/. This permits up to five seconds of real elapsed time before the screenshot is taken. If you omit both --timeout and --virtual-time-budget, Headless captures as soon as the page is loaded.
The correct wait depends on what the page must finish: a fixed delay is useful for a predictable animation, while a script that waits for a specific element or application state is safer for dynamic sites. Chrome’s virtual-time option is a different mechanism: it fast-forwards JavaScript timers rather than making the process sleep for the same amount of wall-clock time.
Use --timeout for a real-time delay
Chrome Headless measures the --timeout value in milliseconds. A value of 5000 means five seconds:
chrome --headless --screenshot --timeout=5000 https://example.com/Chrome applies this option to Headless screenshots, DOM dumping and PDF printing. The command loads the URL, waits for the requested real-time interval (up to the specified duration), and then performs the capture.
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Choose an output filename and format
By default, Chrome writes a screenshot file in the current directory. You can specify a path and use a format supported by your Chrome build:
chrome --headless --screenshot=page.png --timeout=5000 https://example.com/Use a URL with a trailing slash when you want to avoid ambiguity, and quote URLs containing shell metacharacters:
chrome --headless --screenshot='page.png' --timeout=7500 'https://example.com/products?view=grid&sort=price'What the delay does not guarantee
A five-second timeout is not a promise that every network request, animation or application task has completed. It is simply a maximum real-time wait before capture. A slow API, a blocked request or an animation longer than the chosen interval can still produce an incomplete image. Select the value from the page’s behavior rather than treating five seconds as universal.
Real time versus virtual time
| Option | What advances | Best use | Important limitation |
|---|---|---|---|
--timeout=5000 |
The actual process waits up to 5,000 milliseconds. | Pages that need real time for rendering, network responses or human-like pacing. | The page may still be unfinished when the interval ends. |
--virtual-time-budget=5000 |
Chrome fast-forwards page timers as though five seconds elapsed. | Deterministic code driven by setTimeout or setInterval. |
It is not five seconds of wall-clock waiting and is not a general substitute for network waiting. |
Real elapsed waiting
Use --timeout when a page depends on actual time passing. This includes a client-side render that begins after load, a transition that must visibly progress, or a service that needs time to return remote data.
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chrome --headless --disable-gpu --screenshot=delayed.png --timeout=10000 https://example.com/The value is in milliseconds: 1000 is one second, 10000 is ten seconds, and 60000 is one minute. Very long values make failures slow to diagnose, so keep a command-line delay bounded.
Fast-forwarding JavaScript timers
--virtual-time-budget makes time-dependent page code run as if the budget had elapsed. Chrome for Developers describes virtual time as a “fast-forward” for code such as setTimeout and setInterval. For example:
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chrome --headless --screenshot=timer.png --virtual-time-budget=5000 https://example.com/This can make timer-driven demos reproducible without waiting five real seconds. It should not be used as a blanket replacement for --timeout when the page relies on external network activity, real-time services or behavior outside JavaScript timers.
When a fixed delay is the wrong wait
Fixed sleeps are easy to add but inherently approximate. If you know the element or state that marks readiness, automation code can wait for that condition and capture immediately afterward. This avoids both an unnecessarily long delay and a screenshot taken before the required content appears.
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- A results container exists and contains rows.
- A loading spinner is hidden or removed.
- A specific image has completed loading.
- An application adds a class such as
readyto its root element. - A network-driven status changes from “Loading” to “Complete.”
Use a fixed timeout as a fallback when there is no reliable signal, and combine it with a bounded overall navigation timeout in production. A readiness condition should be specific to the page; a generic selector such as body usually becomes true too early.
Puppeteer: wait in JavaScript, then capture
Puppeteer exposes screenshot capture through page.screenshot(). Install it in a project, launch a browser, navigate, wait, and write the image:
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({headless: true});
try {
const page = await browser.newPage();
await page.goto('https://example.com/', {waitUntil: 'load'});
await new Promise(resolve => setTimeout(resolve, 5000));
await page.screenshot({path: 'screenshot.png', fullPage: true});
} finally {
await browser.close();
}
})();The promise resolves after five real seconds. For a page-specific condition, replace the sleep with a selector wait:
await page.waitForSelector('.results-loaded', {timeout: 30000});
await page.screenshot({path: 'results.png'});A selector wait is generally more meaningful than guessing a duration, but it can fail if the site changes its markup. Keep a timeout on the condition so a missing element does not leave a worker running indefinitely.
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Playwright: use a page wait before the screenshot
Playwright’s Page API provides screenshot capture and a page wait method. A minimal Node.js example is:
const {chromium} = require('playwright');
(async () => {
const browser = await chromium.launch({headless: true});
try {
const page = await browser.newPage();
await page.goto('https://example.com/', {waitUntil: 'load'});
await page.waitForTimeout(5000);
await page.screenshot({path: 'playwright.png', fullPage: true});
} finally {
await browser.close();
}
})();Check the Playwright version in your project before relying on fixed sleeps in a production workflow. When possible, wait for a locator or application assertion instead:
await page.locator('.results-loaded').waitFor({state: 'visible', timeout: 30000});
await page.screenshot({path: 'results.png'});shot-scraper: use its millisecond wait option
The shot-scraper command-line tool documents --wait INTEGER for delaying capture. For a five-second wait:
shot-scraper https://example.com/ --wait 5000 -o shot.pngAs with Chrome’s timeout, the number is milliseconds and the interval is fixed. Use the tool’s page-specific or scriptable features if the target exposes a better readiness condition.
Delay choices by workload
| Workload | Starting approach | Why |
|---|---|---|
| Static HTML with a short visual transition | --timeout=1000 to --timeout=3000 |
Allows the transition to begin or finish without a large delay. |
| Client-rendered page with known ready element | Puppeteer or Playwright selector wait | Captures when the required state exists rather than after an arbitrary sleep. |
| Timer-based demonstration | --virtual-time-budget |
Advances timer-driven code quickly and repeatably. |
| Remote API or unpredictable third-party content | Scripted condition plus bounded timeout | Separates readiness from a maximum time allowed for a failed request. |
| One-off shell capture | Chrome --timeout |
No automation project is required. |
Troubleshoot an early, blank or inconsistent image
The screenshot is taken before content appears
Increase the real-time --timeout temporarily to establish whether the issue is timing. If the page has a reliable marker, move to Puppeteer or Playwright and wait for that selector or state. A longer fixed delay cannot repair a script error or a permanently failed request.
The virtual-time command still shows missing remote data
Replace --virtual-time-budget with a real --timeout, or use scripted navigation and a readiness condition. Virtual time advances page timers; it does not make an unavailable server respond.
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The output is completely blank
Check the URL from the same machine, confirm that the process can resolve DNS and reach the site, and inspect the page outside Headless. A blank result can come from a failed navigation, a page that requires interaction, a rendering error or a capture taken before client-side content is mounted. Add diagnostics in an automation script and keep the screenshot step after navigation succeeds.
The command appears to hang
Use a finite timeout rather than an unbounded script sleep, and set navigation and selector timeouts in automation. Close the browser in a finally block so failures do not leave orphaned processes. Also verify that the URL is quoted correctly and that the Chrome executable you invoke is the version you intended.
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External data, ads, animations and A/B tests can make a fixed-time capture nondeterministic. Disable or control those sources where your workflow permits, wait for a stable application state, and choose a consistent viewport and user agent. Do not assume that the same millisecond value produces identical content on every site.
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Every real-time delay adds latency to each capture. At scale, a five-second wait multiplied across hundreds of pages consumes substantially more worker time than a selector wait that completes as soon as the page is ready. Conversely, an interval that is too short creates retries and unusable images, which can cost more overall. Measure the page’s own readiness behavior and set a maximum for pathological cases.
Virtual time can reduce wall-clock duration for timer-only pages, but it is unsuitable when correctness depends on real network or real-time behavior. For reliable jobs, record the URL, browser version, selected wait strategy and failure reason so an intermittent image can be reproduced. The available Chrome documentation does not establish a first Chrome release for these exact behaviors, so verify flags against the Chrome version deployed in your environment.
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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)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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Frequently Asked Questions
Does --timeout wait before navigation starts?
No. It is the Headless capture wait applied after the page-loading process begins; it is not a replacement for a navigation or network timeout in an automation framework.
Can I use seconds instead of milliseconds?
No. Chrome’s --timeout, --virtual-time-budget and shot-scraper’s --wait values are expressed in milliseconds.
Which approach is best for a page that has no stable selector?
Use a bounded real-time delay, validate the resulting image, and add failure diagnostics. If the page can be changed, adding a reliable readiness marker is more robust than continually increasing the delay.
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