There is no evidence-based universal winner for capturing authenticated web apps: the right API depends on how the app stores and accepts login state. For a one-off request, ScreenshotOne documents authorization headers, custom headers, and cookies. For reusable browser login state, Browserless documents profiles that preserve cookies, localStorage, and IndexedDB. ScreenshotNeo is the first alternative to try when you also want clean captures, billing only for clean shots, and a low-cost paid entry plan; its supplied feature information does not establish a dedicated authenticated-profile workflow, so verify that its request options fit your app before relying on it.
How to choose an API for a page behind login
A screenshot service does not inherit your browser’s login simply because you give it a URL. It needs credentials or saved browser state, and the target application must allow the service’s request and automation. Start by identifying where the app keeps authentication state and what it requires on each request.
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- Request-time credentials: If the app accepts an Authorization header, another custom header, or cookies, a request-based approach may be enough.
- Reusable browser state: If login depends on multiple browser storage mechanisms or a session established through a browser, look for a saved-profile workflow and confirm exactly which storage types it restores.
- Security and policy: Confirm that automated access is permitted, credentials can be kept server-side, and the service is acceptable under your security and procurement requirements.
The vendor documentation below describes capabilities, not comparative tests. It does not establish which service is faster, more reliable, or visually more faithful on your application.
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Screenshot API options for authenticated web apps
| Option | Documented authentication approach | What it means for your app |
|---|---|---|
| ScreenshotNeo | Its supplied feature information lists custom headers, cookies, user agent, and Authorization. It does not describe a saved authenticated-profile workflow. | Try it first if those request options match the app’s login mechanism and you value clean shots and billing only for clean shots. Test the actual app’s authentication flow before choosing. |
| ScreenshotOne | Authorization header, custom headers, or cookies. The guide notes that cookie capture may require a separate login flow to obtain cookies. | Suitable to evaluate when the app accepts credentials per request or you can securely obtain and supply its cookies. Its authenticated-pages guide outlines these methods. |
| Browserless | Named authenticated profiles can be saved from a live logged-in session and passed to its screenshot endpoint. | Evaluate when the app’s login state is reusable browser state rather than just request headers or cookies. Profiles restore cookies, localStorage, and IndexedDB, but not sessionStorage. |
There is no supported price or performance comparison here. Check each provider’s current pricing, quotas, latency, uptime, capture fidelity, and contractual terms directly before committing.
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ScreenshotOne: pass authentication on the request
ScreenshotOne documents three approaches: send an authentication header when the site supports one; configure a site or firewall to allow its servers when you control that infrastructure; or pass cookies for a cookie-authenticated site that permits automation. Cookie-based capture can require you to build a separate login flow to obtain valid cookies. See the ScreenshotOne guide to authenticated screenshots and its options reference for the relevant request parameters.
Choose one clear credential mechanism for a given capture. ScreenshotOne’s options reference says header options can override values implicitly set by options such as cookies or authorization, so combining mechanisms casually can produce a request different from the one you intended.
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Browserless: reuse a saved authenticated profile
Browserless documents a workflow in which you log in through a live browser session, save the authenticated state as a named profile, then pass that profile name to the screenshot endpoint. Its Authenticated Profiles documentation says profiles restore cookies, localStorage, and IndexedDB; they do not restore sessionStorage. If the target app relies on sessionStorage, this profile mechanism alone may not restore its login.
Profile state is scoped to the API token. Each request receives an isolated working copy, so changes made while a request runs stay in that session’s copy rather than changing the saved profile. Treat the token and stored login state as sensitive credentials.
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Screenshot request shape
Browserless documents a POST request to /screenshot with a URL and screenshot options in the JSON body. Its documented response formats include PNG, JPEG, and WebP. Pass the profile name as ?profile=<profile-name> as described in its profile guide. Use your own endpoint and token values from Browserless; never place a working token or profile containing real credentials in public code.
Secure credentials and validate access
- Keep API keys, cookies, and authorization values on a trusted server, not in browser-side code, public repositories, or shared screenshots.
- Use HTTPS for API calls. ScreenshotOne explicitly recommends HTTPS because HTTP can expose API keys, authorization headers, and cookies in transit, and advises keeping API keys private. See Getting Started and ScreenshotOne API keys.
- Use credentials with only the access the capture job needs. Confirm your app’s policies permit automated capture and that the service meets your organization’s security and compliance requirements.
- Test against a non-sensitive account or staging page first. Verify the screenshot shows the signed-in state you expect and that no login form, access-denied page, or stale account state is captured.
Compare providers with a controlled test
- Choose a page that exercises the same login mechanism and storage behavior as the production page, without exposing sensitive user data.
- Run each candidate with the same target URL, viewport, output format, and relevant rendering options.
- Check whether the capture is authenticated, visually complete, and current. Include any app-specific loading or consent behavior in the check.
- Measure the performance and reliability that matter to your workload, such as latency and successful authenticated captures across repeated runs. The documentation cited here does not supply comparable benchmarks.
- Review current prices, quotas, retention and credential handling, and terms for your intended volume and security environment before selecting a provider.
Or skip the browser setup
For a straightforward authenticated request, ScreenshotNeo offers custom headers, cookies, and Authorization options; check the ScreenshotNeo documentation to confirm the exact request parameters for your login flow. The following one-call example captures a public page; adapt only the target URL as needed, and add the credential parameters appropriate to your app from the docs.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before the shot; bot checks, blank pages, and failed loads are never billed. It also offers an MCP server so AI agents can take screenshots. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common authentication capture failures
The screenshot shows a login page
The credential may be missing, expired, or sent in a format the app does not accept. Check the app’s expected header or cookie names, confirm the cookie domain and path apply to the target URL, and verify that the session is still valid. For a profile workflow, ensure the profile was saved after successful login and uses the expected account.
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The session works in a browser but not in the capture
The app may depend on browser state that the selected method does not provide. In particular, Browserless profiles do not restore sessionStorage. Determine where the app stores its authentication state, then choose request credentials or a browser-state workflow that covers it.
Adding a header or cookie changes the result unexpectedly
Do not assume combined options merge in the way you intend. ScreenshotOne documents that header options can override values implicitly set by cookie or authorization options. Test the specific mechanism alone, inspect the resulting authenticated state, and then add only the options the app requires.
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The site may block automated traffic or restrict access by network or policy. If you own the site, review its firewall and automation rules; ScreenshotOne documents allowing its servers as one possible approach. Do not try to bypass access controls on a site you do not control.
The result is blank, incomplete, or stale
Authentication can succeed while rendering still fails because the page is slow, dependent on client-side loading, or displaying an old session state. Test the target page with the same viewport and wait conditions you intend to use in production, and verify the final image rather than treating a successful HTTP response as proof of a correct capture.
Quick Recap
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