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There are two different ways to trigger website screenshots with webhooks: a webhook can start a capture, or a screenshot service can send a completed capture to your webhook endpoint. Decide which direction your workflow needs before choosing an API. In a deploy-based visual check, for example, your deployment system sends an event that starts captures; in a delivery workflow, your app requests a capture and the provider later POSTs its result to your endpoint.
Choose the direction of the webhook
“Trigger screenshots with webhooks” describes two opposite flows. The webhook sender and receiver change depending on which one you choose, and the payloads, authentication, and timing are provider-specific.
Pattern 1: the webhook starts the screenshot job
Deployment system or caller → provider’s hook URL → screenshot run. Your deployment pipeline sends a POST to a hook URL after a release or other event. The provider begins capturing configured pages, and may compare them with saved visual baselines. Screenshot API documents this deploy-hook pattern; its snapshot hook uses a token in the URL as the credential, and the request body is ignored. Treat that URL as a secret. Screenshot API documentation
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Pattern 2: a completed screenshot is delivered to your webhook
Your app → screenshot request → provider captures → provider POSTs to your endpoint. This is useful when your application needs the image or capture metadata after the page has rendered. PagePixels and AddScreenshots document custom-webhook delivery, while ScreenshotRun describes an asynchronous request followed later by a completion or failure event. The result may be an image encoded in JSON, a hosted link, or another provider-defined payload; do not assume one service’s format applies to another. PagePixels’ webhook guide · AddScreenshots documentation · ScreenshotRun
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If an event should initiate a visual check, use the first pattern. If your application needs to receive the image after a separate capture request, use the second.
What a webhook screenshot workflow needs
- A trigger: for example, a deployment event, a scheduled run, or an application action.
- A capture definition: target URLs and any viewport, full-page, delay, selector, or authentication settings supported by the chosen provider.
- A result path: a synchronous image response, a later provider callback, or a run that stores results for comparison.
- Validation: a way to tell whether the page rendered as intended rather than returning a login screen, error page, or other misleading image.
- Secret handling: credentials and token-bearing hook URLs must not be exposed in browser code, public repositories, or logs.
Set up a deploy-triggered visual check
The following is a provider-specific setup outline for Screenshot API’s hook-started visual check, not a universal webhook recipe. Its documentation describes configuring page sets and widths, then starting a scheduled, manual, or hook-triggered run. Limits and available settings belong to that service and can change; consult its current documentation before relying on them.
1. Define what the run should capture
Configure the pages to check, the viewport widths, and capture options such as full-page rendering or a delay. Screenshot API documents page sets of up to 20 pages and up to 3 widths per configuration. Its visual-check results can be compared with saved baselines, and its usage is counted per page and width rendered. Those limits and billing details are Screenshot API-specific, not general webhook standards.
2. Configure the hook in the provider
Create the provider’s snapshot hook for the configured visual check and store the complete hook URL in a secret manager or protected CI variable. The token in the Screenshot API hook URL is its credential. Do not put it in a public front-end application or print it in build logs. The provider documentation says the request body is ignored for this hook.
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3. POST to the hook from the deployment job
Use the exact hook URL created by the provider. For example, a shell step in a deployment pipeline can use:
curl --fail-with-body --request POST "$SCREENSHOT_API_HOOK_URL"Set SCREENSHOT_API_HOOK_URL as a protected secret in the CI system. This command illustrates the hook-starts-capture pattern documented by Screenshot API; it is not a documented universal endpoint, and the hook URL must come from your own configured run. A successful HTTP response indicates that the endpoint accepted the request; inspect the provider’s run status and page status to validate the captures.
4. Check the rendered pages, not just the HTTP result
A screenshot can be successfully produced while showing the wrong content, such as a login page, a bot-check page, or an application error. Screenshot API exposes page status and recommends checking it. For another provider, find its equivalent status or failure signals before treating an image as a successful visual check.
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In the delivery pattern, your app makes a capture request and configures a callback URL. Your endpoint receives a provider-defined event. AddScreenshots documents a POST with a JSON body that can include a filename, a base64 image, a MIME type, and metadata; it also supports custom headers and optional HTML in the body. ScreenshotRun describes queued work with a later completion or failure callback. These are examples of different provider contracts—not a shared schema.
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Keep the receiver fast
AddScreenshots says its endpoint must return a 2xx status and complete within 60 seconds. Those are AddScreenshots requirements, not a general webhook deadline. If processing an image, storing it, or comparing it could take longer than your provider permits, validate the request, place the work on your own queue, return the required acknowledgment, and process it asynchronously. Follow the provider’s instructions for retries and failure events; the available documentation does not establish a common retry policy.
Build around the exact payload contract
Before writing a production receiver, confirm the provider’s current documentation for:
- Whether it sends image bytes, base64 data, a hosted URL, metadata, or some combination.
- The exact JSON field names, MIME type representation, and maximum payload size.
- Whether completion and failure use different event types or payloads.
- Which authentication headers or signatures are available and how they must be verified.
- The required response code and deadline, plus retry behavior if your endpoint is unavailable.
Do not create an endpoint that assumes an image, url, or status field unless that exact field is documented by the service you use.
Secure webhook URLs, keys, and incoming events
Keep API keys and secret hook URLs server-side. For Screenshot API’s snapshot hook, the URL token itself acts as the credential, so anyone who obtains it may be able to trigger the configured run. Avoid embedding it in a public page, committing it to source control, or logging it verbatim.
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For provider-to-your-endpoint callbacks, use the selected provider’s current authentication and signature-verification instructions. The sources here do not establish one signature header or verification scheme shared by all providers. If the provider supports an authenticated callback, verify it before processing the payload; otherwise, do not mistake the fact that a request reached your URL for proof that it came from the provider.
Choose capture options that make results useful
Capture settings should reflect what you want to detect. A full-page capture can expose changes below the fold; a fixed viewport can make comparisons repeatable. Delays may help pages that render late, while selector-based waits can target a specific element when supported. Credentials, cookies, headers, and other access settings vary across providers.
Deploy checks and baselines
For regression checks, keep the target pages and widths consistent between runs, and compare captures with a saved baseline where the provider supports it. A deployment hook is most useful when it starts the same defined check after each relevant release. Screenshot API documents hook- and schedule-started runs, baseline comparison, and usage measured by rendered page and width.
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For recurring captures rather than release checks, PagePixels documents creating a screenshot, setting its schedule, entering the page URL, and adding a custom webhook address. Its guide describes a five-minute default interval; confirm the active product UI and account settings because schedules and defaults can change. PagePixels also identifies n8n, Pipedream, Workato, Zapier, and Make.com as examples of places to obtain webhook URLs; those mentions are examples, not a guarantee of current compatibility.
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Webhook delivery separates the initial request from the eventual capture result, but it does not by itself make rendering instant or guarantee delivery. A queued screenshot can take time to render, and a callback receiver can be unavailable or too slow. Prefer short acknowledgments and background processing when the provider contract permits it, and monitor both capture outcomes and callback handling.
For visual checks, account for how many pages and viewport widths each run renders. Screenshot API documents per-page, per-width usage; a configuration with more URLs and widths therefore entails more renders under that service’s stated accounting model. Check the selected provider’s current pricing and failure-charge rules rather than inferring them from webhook mechanics.
Troubleshoot common failures
The hook returns an error or does not start a run
- Check that you are using the right direction. A callback URL for completed captures is not necessarily a trigger URL for starting captures.
- Check the stored URL. Ensure the full provider-generated hook URL is present in the CI secret and has not been truncated or encoded incorrectly.
- Check the credential. Screenshot API’s hook token is in the URL; use the configured secret URL and avoid replacing it with a guessed endpoint.
- Check the provider run history. An accepted HTTP request and a completed visual run are different outcomes.
Your endpoint receives a request but cannot process it
- Inspect the provider’s actual schema. Confirm whether the image arrives as base64, a link, or another representation and parse the documented field names.
- Check the response contract. For AddScreenshots, return 2xx and finish within its documented 60-second limit; do not apply that deadline to a different service without confirmation.
- Move slow work off the request path. Queue storage, image analysis, or comparisons and acknowledge within the provider’s permitted window.
- Confirm body and request limits. Base64 images can make JSON bodies large; validate your server and proxy limits against the provider’s documented payloads.
The image exists but shows the wrong page
- Check page status and capture outcome. A screenshot may depict a login, error, or bot-check page while still being a valid image file.
- Review access requirements. The page may require cookies, authorization, or other credentials supported by the selected provider.
- Adjust readiness conditions. If the page renders asynchronously, use an appropriate documented delay or wait condition rather than assuming the first paint is final.
- Compare like with like. Keep the page, viewport, and relevant capture settings stable when comparing against a visual baseline.
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ScreenshotNeo is a website screenshot API and MCP server for developers. It can return a PNG, JPEG, WebP, or PDF from one GET request; for a webhook workflow, call it from your deployment or application code and then send or store the response using your own endpoint logic. This is a capture request, not a provider-to-your-webhook callback.
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FAQ
Can one webhook both start a screenshot and deliver the image?
Not necessarily. Those are separate workflow directions and may require different endpoints or provider features. Check the service’s documentation for each behavior.
Can I send the screenshot directly to Slack or an automation platform?
Some providers document integrations or allow a custom webhook URL, but compatibility depends on the provider’s payload and the destination’s expected request format. Confirm both contracts before connecting them.
Is a screenshot API webhook secure by default?
No common authentication or signature scheme is established across the providers described here. Protect trigger URLs and API keys, and follow the selected provider’s instructions for authenticating incoming callbacks.
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