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To capture a website with a screenshot API over POST, send an authenticated HTTP POST to the provider’s documented endpoint, put the target page URL and capture settings in the JSON request body, then save the response bytes as an image. The endpoint, authentication scheme, options, and response format vary by provider; the example below uses ScreenshotEngine’s documented API.
Send a POST request to ScreenshotEngine
ScreenshotEngine documents the endpoint POST https://api.screenshotengine.com/v1/screenshot. Its example authenticates with a bearer token in the Authorization header and sends JSON with Content-Type: application/json. The request body must include url, the page to capture.
curl --fail-with-body --request POST 'https://api.screenshotengine.com/v1/screenshot'
--header "Authorization: Bearer $SCREENSHOTENGINE_API_KEY"
--header 'Content-Type: application/json'
--data '{
"url": "https://example.com",
"format": "png",
"height": "full"
}'
--output screenshot.pngSet SCREENSHOTENGINE_API_KEY in your server environment before running the command; do not put a real key in code committed to a repository, a public URL, or browser-side JavaScript. The --output option writes the response body to screenshot.png. ScreenshotEngine documents a successful response as image bytes directly, not JSON containing a download link. Its documentation uses --fail-with-body, which requires cURL 7.76 or later.
See ScreenshotEngine API documentation for the provider’s request contract. (Use the official quickstart, parameter reference, and authentication documentation before adapting the example; their specific documentation URLs were not supplied here.)
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What the request fields do
The example asks for a PNG and full-page height. ScreenshotEngine’s POST parameter names are case-sensitive and differ from its GET query-parameter names. Use valid JSON types: booleans should be true or false, and numeric settings should be JSON numbers rather than quoted strings. The provider documents url as the only required POST body field.
| Field | Purpose in this example |
|---|---|
url |
The page to render and capture. Required by ScreenshotEngine. |
format |
png requests PNG output. |
height |
full requests a full-page capture. Full-page capture is opt-in for this provider. |
If you send only url, ScreenshotEngine documents a default JPEG at a 1280 × 720 viewport. Capture settings—including dimensions, full-page behavior, cookie-banner blocking, and dark mode—are provider-specific; confirm supported fields and defaults in the API’s documentation rather than assuming another service uses the same names or behavior.
Handle the response as bytes, not automatically as an image
Check the HTTP status before treating the saved body as a valid screenshot. ScreenshotEngine documents image bytes for successful captures and JSON for errors, so a failed response saved with an image extension is still an error payload, not a usable PNG. The cURL command’s --fail-with-body makes HTTP failures visible while retaining the error body for inspection.
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In an application, branch on the response status and content type: save successful image responses as binary data, and read an error response as JSON or text for diagnosis. Do not parse a successful image body as JSON.
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Cloudflare Browser Run also documents a POST screenshot endpoint. Its Browser Run screenshot documentation describes rendering a webpage from a URL or supplied HTML and lists REST API and Workers Bindings as invocation options. It identifies previews, dashboards, reports, automated testing, QA, and visual regression as use cases. This is a separate provider’s endpoint and contract; do not copy ScreenshotEngine’s URL, headers, body fields, or response-handling assumptions into a Cloudflare request.
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Troubleshoot common failures
- Authentication fails: verify that the key is valid and sent as
Authorization: Bearer …. ScreenshotEngine’s authentication guidance says anapi_keyproperty in the JSON body does not authenticate the request. - The API rejects the request body: ensure it is valid JSON, includes
url, and uses the exact, case-sensitive POST field names and expected value types. - The output file is not an image: inspect the HTTP status and error body. The provider documents JSON error responses; do not assume that a file named
screenshot.pngcontains an image. - Full page is missing: request full-page height explicitly. ScreenshotEngine says its default is a 1280 × 720 viewport and that full-page capture is opt-in.
- The cURL command rejects
--fail-with-body: check the installed cURL version; the provider’s example requires cURL 7.76 or later. - Another provider rejects these fields: use that provider’s own endpoint documentation. POST field names, authentication, defaults, and output behavior are not universal.
Or skip the browser setup
ScreenshotNeo is a website screenshot API with a single GET request: pass a URL and receive an image or PDF. It accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and responses include X-Page-Verdict and X-Billed headers. It also provides an MCP server with take_screenshot, get_page_info, and capture_pdf tools for AI agents.
For example, this cURL request saves a WebP screenshot of Stripe. Create an API key and see the ScreenshotNeo documentation for request options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 screenshots. Every feature is available on every plan. Sign up for ScreenshotNeo’s free plan to start capturing.
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Frequently Asked Questions
Can I put the API key in the POST JSON body?
Not for ScreenshotEngine: its authentication documentation says a JSON api_key field does not authenticate the request.
Does a POST screenshot API always return an image file?
No. ScreenshotEngine documents image bytes on success and JSON on errors; other providers may have different response contracts.
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Is POST supported by every screenshot API?
No. Check the chosen provider’s documentation for its supported method, endpoint, authentication, and request format.
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