How to Fix a Screenshot API 401 Error in a Pabbly Connect Workflow

A 401 in a Pabbly Connect screenshot workflow means a request received an unauthorized response, but first identify which request. The screenshot service may be rejecting the credential Pabbly sent. Alternatively, the service may have accepted the request and captured a target website that displays its own login or unauthorized page. Those are different problems with different credentials.

The exact authentication scheme, endpoint, and key checks depend on the screenshot API. Use that provider’s current API reference and the failed Pabbly step’s response; do not assume every service accepts a Bearer token.

1. Locate the request that returned 401

In Pabbly Connect, open the workflow’s failed execution and inspect the screenshot action’s details.
Record the HTTP status, response body, and relevant response headers. Redact API keys, bearer tokens, cookies, and other secrets before sharing logs.
Check the destination hostname. It should be the screenshot service endpoint, not the URL of the web page you want to capture.
Look at the response format and any documented page-status or verdict metadata. A provider error describing a missing or invalid API key points to API authentication; a successful screenshot response containing a login page points to authentication at the target website.

A 401 status by itself does not identify the cause. The provider name and its response details are needed for an exact diagnosis.

2. Match Pabbly’s authentication to the provider’s API

Open the authentication section of the API reference for the service configured in the workflow. Confirm the exact scheme and where the credential belongs: an authorization header, a named custom header, a query parameter, or another documented mechanism. Pabbly’s API request configuration supports several REST authentication types, including Basic Auth, Bearer Token, and parameter-based credentials, along with request headers and parameters. Select the documented type for your provider.

For Bearer authentication, the provider may require a header such as Authorization: Bearer YOUR_API_KEY. That is only correct if the provider’s documentation specifies it. For example, Screenshot API at screenshot-api.org documents Bearer, X-API-Key, and query-key forms; its documentation says a missing or invalid key returns 401. These are provider-specific examples, not universal screenshot API conventions.

Configure the request in Pabbly

Open the failed API action and confirm its destination URL and HTTP method against the provider’s API reference.
Set Pabbly’s authentication option to the documented scheme. If using Pabbly’s Bearer Token option, enter the key in its token field; if the provider calls for a custom header or query parameter, configure that exact name and value instead.
Check the required content type, request body, query parameters, and other headers. Include the target page URL in the field the screenshot endpoint specifies.
Save the step and run a fresh test. Inspect the new response status and body; do not treat the workflow editor’s successful save as proof that the request authenticated.

Pabbly documents these authentication choices and request fields in its API and inbuilt-app configuration guidance. Verify the exact endpoint and field names with your screenshot provider.

3. Verify the API key and request details

Key completeness: Copy the whole key. Check for leading or trailing whitespace, truncation, or accidental quotation marks.
Correct account or project: Confirm the key belongs to the account or project the workflow is intended to use, where the provider exposes that distinction.
Key status: Check whether the provider documents key expiration, revocation, or disabling and verify the key’s current status using its documented account controls.
Credential placement: Make sure Pabbly sends the key in the exact header or parameter the API expects. Do not send the same secret in multiple places unless the provider instructs you to.
Endpoint and method: Check the service hostname, path, and HTTP method carefully. A correct key sent to a different API endpoint may not authenticate.
Request fields: Compare query parameters, body format, content type, and required headers with the provider’s current example request.

Do not paste a live key into screenshots, workflow notes, shared logs, or support messages. Replace it with a placeholder before sharing the request for help.

4. Tell API authentication apart from target-site authentication

The screenshot API credential authorizes Pabbly to request a screenshot from the provider. It does not automatically sign in to the website being captured. If the API returns a successful image or PDF but that output shows a login or unauthorized page, the provider request may have succeeded while the target site required its own session or access.

Check the screenshot provider’s response and documentation to determine whether the API call succeeded and what target-page status information it exposes. If the target site is private, use only an access method supported by that site and the screenshot provider. Do not assume that adding the screenshot API key as a target-site cookie or header is appropriate.

5. Troubleshooting by symptom

Symptom	Likely area to inspect	Next action
401 response body says the API key is missing	Credential not sent, wrong field, or wrong authentication scheme	Compare Pabbly’s auth setting and outgoing header or parameter with the provider’s documented request.
401 response says the key is invalid	Typo, incomplete key, wrong account or project, or a key the provider no longer accepts	Copy the key again from its source and check its status using provider-documented account controls.
401 persists after changing to Bearer	The provider may use a different scheme, header name, or query parameter	Stop guessing; use the provider’s authentication reference and verify the actual request Pabbly sent.
401 appears only in the Pabbly workflow	The workflow may be sending a different value or request shape than a manual request	Compare the failed step’s method, URL, headers, parameters, and body to a documented provider example. Redact secrets when comparing.
API reports success, but the screenshot shows a sign-in page	Authentication at the target website rather than at the screenshot API	Inspect the provider’s response metadata and the target site’s access requirements separately.
The response is not clearly an authentication error	Provider-specific behavior or a different layer returned the response	Use the status, body, headers, and provider documentation together; do not diagnose from status alone.

6. Test and operate the workflow reliably

Make one change at a time and rerun the failed step so you can tell which correction changed the response.
Keep credentials in the workflow’s designated authentication fields or other supported secret storage, and limit who can view or edit the workflow.
When a workflow starts failing after a key change, update the configured credential and verify that no old value remains mapped into a header or parameter.
For repeated failures, retain the sanitized status, response body, timestamp, endpoint, and request shape. Those details help distinguish a credential problem from a target-page problem.
Do not blindly retry an unchanged 401 request. First correct the request or credential based on provider documentation.

A 401 is an authorization response, not a measure of screenshot rendering speed. This diagnosis does not establish a cause-specific price or retry policy; check the selected provider’s current plan and API documentation for billing and request limits.

Or skip the browser setup

ScreenshotNeo is a website screenshot API and MCP server for developers. A single GET request returns a PNG, JPEG, WebP, or PDF. It removes cookie and consent banners, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and responses identify the page verdict and billing status in headers. Its MCP server provides screenshot tools for Claude, Cursor, and other MCP clients.

To use ScreenshotNeo, create an API key and send a GET request to the documented endpoint. The examples below use Stripe as the target URL; replace it with the page you want to capture. See the ScreenshotNeo API documentation for authentication and request options.

cURL

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

Python

import requests

r = requests.get(
    "https://api.screenshotneo.com/v1/shot",
    params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
    timeout=90,
)
r.raise_for_status()
with open("shot.webp", "wb") as f:
    f.write(r.content)

Node.js

const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`ScreenshotNeo returned HTTP ${res.status}`);
const image = Buffer.from(await res.arrayBuffer());
await import('node:fs/promises').then(fs => fs.writeFile('shot.webp', image));

ScreenshotNeo includes full-page and selector captures, device and viewport settings, retina scale, PDF options, custom CSS and JavaScript, wait controls, request blocking, custom headers and cookies, caching, signed image links, asynchronous jobs, bulk capture, and a usage API. The documented parameter names used by other screenshot APIs also work, which can simplify a switch. Plans include 1,000 screenshots per month free with no card; paid plans start at $5 for 3,000 screenshots. Every feature is on every plan, and yearly billing gives two months free.

Create a free ScreenshotNeo account for 1,000 screenshots a month with no card.

FAQ

Does every screenshot API use Authorization: Bearer?

No. The required scheme and credential location depend on the provider. Check its current authentication reference.

Yes, after removing API keys, bearer tokens, cookies, and other secrets. Keep the status, non-sensitive response details, and relevant request configuration.

What information is needed for an exact fix?

The screenshot API provider, the failed step’s sanitized response body and headers, and the configured method and endpoint. Never include the live credential.