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How the Browserless workflow works
Browserless exposes a POST /screenshot endpoint. You send a page URL and screenshot options, authenticate with a token in the query string, and receive an image. For a signed-in page, the key is to save the authenticated state after login finishes and attach that profile to the screenshot request. Browserless lists /screenshot as a profile-supported endpoint and says it restores the state before rendering.
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- Open a Browserless Chromium session using a CDP-capable client such as Puppeteer or Playwright.
- Complete the site’s normal, authorized login flow and wait until the final redirect returns to the application and the protected page is accessible.
- Save the authenticated browser state using Browserless’s profile mechanism.
- Send a POST request to the Screenshot API with the protected page URL, screenshot options, token, and saved profile name.
- Inspect the returned image to confirm it shows the authenticated page rather than a login form or an intermediate challenge.
Browserless’s documentation describes profile restoration before rendering, but it does not establish compatibility with any unnamed site’s authentication system.
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Save a profile only after login is complete
Saving too early is a common cause of screenshots that show a login form. Wait for the full authentication flow, not merely a successful-looking click or an initial redirect. If a third-party identity provider is involved, wait until the browser returns to the application before saving; otherwise, the state may be associated only with the identity provider’s origin.
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Profiles include cookies, localStorage, and IndexedDB entries, so they can retain state that a cookie-only approach misses. Browserless documents a 2 MB captured-state limit and a maximum of 50 distinct origins per profile; see its Authenticated Profiles documentation for the feature and limits.
Use the Screenshot API with the saved profile
The API takes a POST request. The token is a query parameter; the request body can contain a page URL and options such as full-page capture and output type. The profile name is passed as a query parameter on the same screenshot endpoint, as shown in Browserless’s authenticated-profile guidance. Use the exact profile parameter and request-body shape from the current Browserless documentation for your account and client.
curl -X POST "https://YOUR-BROWSERLESS-ENDPOINT/screenshot?token=YOUR_TOKEN&profile=YOUR_PROFILE"
-H "Content-Type: application/json"
-d '{"url":"https://example.in/account/reports","options":{"fullPage":true,"type":"png"}}'
--output screenshot.pngReplace the endpoint, token, profile, and target URL with your own values. The documented quickstart returns PNG by default; JPEG and WebP are also available by configuration. Refer to Browserless’s Screenshot API reference for the current request schema and endpoint details.
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Important request and capture options
- URL or HTML: Send a page URL or inline HTML, not both in the same request.
- Image output: Configure the output type for PNG, JPEG, or WebP; quality is also documented as a capture option.
- Capture area: Full-page capture, clipping, viewport size, device scale factor, and element selection are documented controls.
- Lazy-loaded content: A long page may need scrolling before capture so images and other deferred content load. Use the documented scroll option when needed.
Alternative: inject cookies into a browser session
If you manage the browser session directly, you can reuse captured cookies rather than saving a full profile. Add them before the first request to the protected page, and preserve the cookie records’ original domain or URL and security attributes, including secure and sameSite. Do not guess missing attributes: a recreated cookie with incorrect properties can be rejected or ignored.
Cookie injection is narrower than a profile. If the site keeps authentication state in localStorage or IndexedDB as well as cookies, cookies alone may not restore the session. Browserless’s session-state documentation covers cookies and page setup; its profile documentation describes the broader stored state.
Choose between a profile and cookie injection
| Approach | What it restores | Useful when | Trade-offs |
|---|---|---|---|
| Authenticated profile | Cookies, localStorage, and IndexedDB | You need repeat screenshot requests using a previously saved signed-in state. | Requires a successful setup session; subject to the documented 2 MB state and 50-origin limits. |
| Cookie injection | The cookies you explicitly provide | You need direct control over which captured cookies enter a browser session. | Requires correct cookie domains and attributes; does not by itself restore state stored outside cookies. |
Troubleshooting
The screenshot shows a login page
Confirm that the login flow completed, the final redirect reached the application, and the profile was saved afterward. Check that the screenshot request uses the intended profile name and that the protected URL is the one you tested.
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The profile appears to have no useful authentication state
Authentication may be held in localStorage or IndexedDB rather than in cookies alone. Test the saved profile by loading the protected page, and ensure the profile was captured after the full login flow. If an identity provider was used, save only after the return redirect to the application.
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Injected cookies are ignored
Set cookies before navigating to the protected page. Compare their domain or URL, secure, and sameSite values with the original captured records rather than inventing replacements. If the site uses other browser storage, try a profile instead.
A long page is cut off or missing images
Enable full-page capture. For content loaded as the page scrolls, use the documented scrolling behavior before capture so lazy-loaded elements have an opportunity to appear.
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The page presents an OTP, CAPTCHA, or access challenge
Compatibility cannot be determined without knowing the target site and its authentication design. Browserless documentation discusses unblocking and bot detection separately, but that does not establish that a particular challenge can or should be automated. Use only an authorized flow and respect the site’s access rules.
The request fails before returning an image
Check the token query parameter, endpoint, request method, JSON body, and whether you accidentally sent both html and url. For endpoint and request-format details, consult the Browserless REST APIs introduction and Screenshot API reference.
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ScreenshotNeo is a website screenshot API and MCP server. It accepts a URL in a single GET request and returns an image or PDF. It is an alternative when you do not need to preserve a signed-in session through a Browserless profile; no claim is made here that it can capture a site requiring authentication.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.in -o shot.webpSee the ScreenshotNeo documentation for request details. It removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, failed loads, timeouts, and cache hits are not billed. Its MCP server provides screenshot tools for AI agents. The free plan includes 1,000 screenshots per month with no card, and paid plans start at $5 for 3,000.
Sign up for ScreenshotNeo’s free plan.
Frequently Asked Questions
Does Browserless guarantee that a screenshot will bypass an Indian site’s login or CAPTCHA?
No. A site’s particular authentication and challenge behavior cannot be established without site-specific information, and no bypass is promised.
Can I send both inline HTML and a page URL in one Screenshot API request?
No. Browserless warns not to include both inputs in the same request.
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