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How to Capture a Page After It Loads with ScreenshotAPI

Choose a ScreenshotAPI navigation event, wait for a meaningful CSS selector when needed, and keep navigation timeouts separate from post-load delays.
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Use ScreenshotAPI’s waitUntil option to choose when navigation is considered ready, then add waitForSelector if a particular element must appear before the screenshot. Use delayMs only when a fixed extra pause is appropriate. The API documents networkidle2 as the default readiness event and timeoutMs as a separate navigation deadline. ScreenshotAPI’s API reference documents these request options.

Choose what “loaded” means for the page

A browser navigation event tells the capture service that a general stage of navigation has occurred; it does not guarantee that every application-specific widget or piece of asynchronous content is ready. ScreenshotAPI lists four waitUntil values:

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Value What to consider
load Wait for the page’s load event.
domcontentloaded Wait for the DOM content-loaded event.
networkidle0 Wait for the network-idle condition represented by this option.
networkidle2 Wait for its network-idle condition; this is the documented default.

The reference lists these names and the default but does not establish that any one is best for every site. Choose the general event that fits the page, then add a more specific condition if the content you need appears afterward.

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Wait for the content that matters

Use a selector when the target element is identifiable

Set waitForSelector to a CSS selector for an element that indicates the content you want is present—for example, a page’s main content container. This is a condition-based wait: capture proceeds after the selector appears rather than after an arbitrary amount of extra time. Use a selector that exists on the target page and corresponds to the content you need.

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Use a delay for a known settling period

delayMs adds a fixed pause in milliseconds after load. It can help when a page reliably needs extra settling time, but it does not check whether a specific element has appeared. The 500 ms value in the example below is illustrative, not a ScreenshotAPI recommendation or a tested setting. Adjust or omit it for the page you are capturing.

Set a navigation timeout separately

timeoutMs sets the navigation timeout; the API reference documents a default of 30,000 ms. It is not the same as delayMs: the timeout bounds navigation, while the delay adds time after load. A longer navigation deadline does not itself tell the service to wait for a particular late-rendered element.

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Make a ScreenshotAPI request

The documented request uses POST, JSON, and an Authorization bearer key. Replace YOUR_API_KEY with your API key and .main-content with a CSS selector present on the page you are capturing.

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curl -X POST "https://api.screenshot-api.org/api/v1/screenshot" 
  -H "Authorization: Bearer YOUR_API_KEY" 
  -H "Content-Type: application/json" 
  -d '{
    "url": "https://example.com",
    "format": "png",
    "waitUntil": "networkidle2",
    "waitForSelector": ".main-content",
    "delayMs": 500,
    "timeoutMs": 30000
  }'

Keep API keys out of public code and logs. The endpoint, authentication style, parameter names, and documented timeout default above are from ScreenshotAPI’s API reference; the example URL, selector, and delay are placeholders to adapt, not independently tested settings.

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Troubleshoot captures that are too early or time out

  • The screenshot misses late content: A navigation event may have completed before the content rendered. Add waitForSelector for a meaningful element, or use a suitable delayMs if you know a fixed pause is needed.
  • The selector wait does not finish: Check that the CSS selector matches an element on the requested page and that the element is expected to appear. A selector for the wrong element cannot serve as a readiness signal.
  • Navigation times out: Review timeoutMs as the navigation deadline. Increasing it may allow slower navigation more time, but it does not replace a selector wait or a post-load delay.
  • The capture waits longer than needed: Avoid stacking a long fixed delay onto a readiness condition without a reason. A selector expresses a content condition; a delay always spends its configured time.

Or skip the browser setup

ScreenshotNeo offers a one-request screenshot API and an MCP server for AI agents. Its capture flow accepts cookie and consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before the shot; each cleanup step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers indicate the page verdict and billing status.

For example, this cURL request saves a WebP screenshot of Stripe:

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

See the ScreenshotNeo API documentation for the request options. The MCP tools include 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 screenshots. Sign up for 1,000 free screenshots a month, with no card required.

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Frequently Asked Questions

Does waitUntil guarantee that a page’s dynamic content is ready?

No. It selects a general navigation event; use waitForSelector when a particular element must be present.

Is timeoutMs the same as delayMs?

No. timeoutMs is the navigation deadline, while delayMs is an additional post-load pause.

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