Use browser automation to sign in once, save the authenticated browser state, then restore it while visiting and capturing each URL. With Playwright, this works when the target site accepts the saved state and your account is authorized to access every page. The state file is sensitive: it may contain credentials that can impersonate your account.
How the workflow works
Single sign-on (SSO) usually redirects a browser through an identity provider before returning it to the application. Rather than repeat that flow for every screenshot, complete the approved sign-in once and save the browser context’s state after authentication has settled. Then initialize a fresh context from that state, navigate to each target URL, and capture each page.
- Choose authorized URLs. Make a list of destinations and use an account permitted to access each one. Different routes or domains may have different access policies.
- Sign in through the normal flow. Complete any identity-provider steps required for the account. Do not assume multi-factor authentication (MFA), CAPTCHA, or conditional-access checks can or should be skipped.
- Wait for authentication to finish. Redirects can set cookies over multiple steps. Wait for the final URL or an element that appears only after successful sign-in before saving state.
- Save the state privately. Keep the file outside version control and restrict access to it.
- Restore state and capture each page. Open each destination in the authenticated context, wait for the intended page state, and save a distinct screenshot.
- Review the images. Check that each capture shows the expected signed-in page rather than a login, access-denied, redirect, or loading screen.
Playwright documents this save-and-reuse approach in its authentication guide and provides page screenshot functionality in its visual comparisons documentation.
Runnable Playwright example
The following Node.js example opens a browser for interactive sign-in, saves authenticated state, then uses it to capture a list of pages. Install Playwright with npm install playwright and install its Chromium browser with npx playwright install chromium. Replace the example URLs and the post-login URL or selector with values for your application.
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const { chromium } = require('playwright');
const targets = [
'https://app.example.com/reports',
'https://app.example.com/settings'
];
(async () => {
const browser = await chromium.launch({ headless: false });
// First run: complete the approved SSO sign-in in this browser.
const loginContext = await browser.newContext();
const loginPage = await loginContext.newPage();
await loginPage.goto('https://app.example.com/login');
// Complete sign-in, including any required interactive steps.
// Wait for an authenticated URL or UI element before saving state.
await loginPage.waitForURL('**/home', { timeout: 120000 });
await loginContext.storageState({ path: 'playwright/.auth/state.json' });
await loginContext.close();
// Restore the saved state for the capture run.
const context = await browser.newContext({
storageState: 'playwright/.auth/state.json',
viewport: { width: 1440, height: 1000 }
});
for (let i = 0; i < targets.length; i++) {
const page = await context.newPage();
await page.goto(targets[i], { waitUntil: 'domcontentloaded' });
// Prefer a meaningful app-specific ready condition where possible.
await page.locator('main').waitFor({ state: 'visible', timeout: 30000 });
await page.screenshot({ path: `screenshots/page-${i + 1}.png`, fullPage: true });
await page.close();
}
await context.close();
await browser.close();
})().catch(error => {
console.error(error);
process.exitCode = 1;
});Create the playwright/.auth and screenshots directories before running this example. The URL pattern and main selector are application-specific; if the login completes at a different URL, change the wait condition to the actual final URL or use a locator for an authenticated interface element.
After the first successful run, avoid repeating the interactive sign-in on every batch: split setup from capture so the capture job reads the existing state file. Refresh the state by running the sign-in step again when the session expires. If sign-in relies on an API that your application supports and permits, Playwright also documents API-based authentication as an alternative pattern; it is not available for every SSO setup.
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Protect the saved authentication state
Playwright warns: “The browser state file may contain sensitive cookies and headers that could be used to impersonate you or your test account.” Treat the file like a password: do not commit it, publish it, or place it in a shared artifact directory.
- Add
playwright/.authto.gitignore. - Limit file and job access to the people and systems that need it.
- Remove the state when it is no longer needed, and regenerate it through the permitted sign-in flow when it expires.
Know which browser storage is covered
Applications can keep authentication data in cookies, local storage, IndexedDB, or passkeys (WebAuthn). Playwright’s storage-state workflow supports the documented categories, but the site must accept the restored state. Session storage is different: it is tied to a domain and does not persist across page loads. Playwright does not provide built-in session-storage persistence, though its authentication guide describes a custom save-and-restore approach.
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MFA, CAPTCHA, conditional access, and identity-provider rules vary by organization and application. A saved session may avoid a new login only while the site accepts it; it is not a universal workaround for an interactive challenge. Follow the site owner’s rules whenever a challenge appears.
Make captures consistent and verifiable
For reliable comparisons, keep the browser version, host operating system, browser settings, hardware, power conditions, and headless mode consistent. Playwright notes that these factors can change rendered screenshots. Its visual comparisons documentation says screenshots are PNG by default; WebP can be requested by using a filename with the .webp extension.
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Use waits that reflect the page’s actual readiness. A navigation event alone may happen before client-rendered content, images, or charts are ready. Wait for a known page element or application-specific condition, then inspect the image outputs. If captures are automated tests rather than files for manual review, Playwright’s PageAssertions screenshot API offers a test-runner-oriented assertion option; it is distinct from simply saving a screenshot.
Troubleshooting
- A capture shows the login page. The state may have been saved before redirects or cookies settled, may have expired, or may not be accepted for that target. Wait for the authenticated UI before saving, sign in again, and verify that the account can access that URL.
- One URL works but another does not. Check whether it is on a different domain, requires a different permission, or uses a separate authentication policy. Do not assume one application’s state authorizes every destination.
- A session works in the first context but not after restore. Check the storage mechanism used by the application. Session storage needs custom handling; confirm the relevant data is present in the restored page and follow Playwright’s documented approach if needed.
- The sign-in wait times out. The final URL may differ from the example, or an MFA or other interactive step may still be pending. Update the wait condition to match the successful destination or authenticated element, and complete required challenges normally.
- The page is blank or incomplete in the image. Wait for the element or content that signals the page is ready, and check for access errors or failed navigation before saving. A screenshot can faithfully capture an unfinished page.
- Images differ across runs. Stabilize the browser and host environment, viewport, page state, and timing. Review the actual output rather than assuming identical markup guarantees identical pixels.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. For an authorized page that is publicly reachable to the API, one GET request can return an image or PDF; it does not reuse your private SSO session, so it is not a substitute for authenticated browser state on protected pages.
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See the ScreenshotNeo documentation for request options. Example cURL request:
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Frequently Asked Questions
Can one saved SSO state work for more than one URL?
It can, when the target application accepts that state and the account has permission to open each destination.
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Pick the symptom - the matching free tool is one click away.
Does saving Playwright state bypass MFA or CAPTCHA?
No universal bypass is established; follow the application’s and organization’s required sign-in process.
Can I use ScreenshotNeo for a page behind SSO?
ScreenshotNeo’s URL-based request does not reuse a private browser session. Use the Playwright workflow for protected pages that require your authenticated state.
Quick Recap
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