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How to Set Cookies and Headers in ScreenshotMachine’s API with cURL

ScreenshotMachine’s documented Bash/cURL API supports cookies, Accept-Language and User-Agent parameters, but its reviewed docs do not establish arbitrary custom headers or a separate CLI.
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ScreenshotMachine’s official documentation shows a Bash and cURL method for calling its screenshot API; it does not establish a separate CLI executable. Pass cookies in the cookies query parameter, and use accept-language and user-agent for those documented request-header controls. The reviewed API documentation does not describe a general-purpose custom-headers option.

Pass cookies and documented headers with cURL

ScreenshotMachine’s API uses HTTP GET. The vendor’s Bash example calls https://api.screenshotmachine.com with a customer key and target URL. This pattern adds a cookie string, language and user agent to that request:

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CUSTOMER_KEY="YOUR_CUSTOMER_KEY"
URL="https://example.com/account"
COOKIES="session=YOUR_SESSION_VALUE;theme=dark"
LANGUAGE="en-US"
USER_AGENT="Mozilla/5.0 (compatible; ExampleBot/1.0)"

ARGS=(
  --data-urlencode "key=$CUSTOMER_KEY"
  --data-urlencode "url=$URL"
  --data-urlencode "cookies=$COOKIES"
  --data-urlencode "accept-language=$LANGUAGE"
  --data-urlencode "user-agent=$USER_AGENT"
)

curl -Gs "https://api.screenshotmachine.com" "${ARGS[@]}" > output.png

This is assembled from the vendor’s documented Bash example and parameter table; it is not a tested command. Replace the placeholders with your own authorized account key, target URL and cookie values. The request saves the response body as output.png.

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Encode cookie pairs safely

Use semicolon-separated cookie name/value pairs, for example session=YOUR_SESSION_VALUE;theme=dark. ScreenshotMachine says cookie values must be percent-encoded; its example represents name1=value1;name2=value2 as name1%3Dvalue1%3Bname2%3Dvalue2. The vendor’s Bash sample uses curl --data-urlencode, which encodes each parameter value for the request. Avoid manually encoding the string and then encoding it again.

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Cookies can grant access to an account. Use only sessions you are authorized to use, and keep customer keys, cookies and any secret phrase out of shared scripts, source control and public logs.

Which cookie and header parameters are documented?

Parameter Purpose Important distinction
cookies Applies semicolon-separated cookie pairs during capture. Percent-encode the value; use --data-urlencode as shown above.
accept-language Controls the documented Accept-Language request header, such as en-US. This is a specific supported control, not a general header mechanism.
user-agent Controls the documented User-Agent request header. The API documentation gives a Samsung Galaxy S20 browser user agent as an example.
Arbitrary custom headers A general parameter for sending any header. Not documented on the reviewed official Website Screenshot API page; do not assume syntax such as --header or headers=Authorization:... is supported.

ScreenshotMachine also documents click and hide options, but they do not send cookies. click triggers a click on a CSS selector before capture; hide hides selected page elements, including cookie banners.

Authenticate the API request

The required query parameter is key, containing your customer key. If you have configured a secret phrase, ScreenshotMachine documents a hash calculated as the MD5 of the target URL concatenated with that phrase. According to the vendor, requests with a missing or incorrect hash are ignored. See the vendor’s API documentation and Python example repository for its authentication examples.

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Do not expose credentials in client-side code or logs. The vendor’s Python example recommends configuring a secret phrase when calls originate from publicly accessible webpages.

Troubleshoot a response that is not the screenshot

The service may return an error image for an invalid or incomplete request. If the saved file looks wrong, inspect the X-Screenshotmachine-Response header rather than assuming the image is a successful capture.

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Response code What to check
invalid_key Check that key contains the correct customer key.
invalid_url Check that the required target URL is valid and encoded. The vendor strongly recommends URL percent-encoding.
invalid_selector If using a selector-related option, verify that the CSS selector is valid.
no_credits Check the account’s available credits.

For a page that loads slowly or needs a specific capture area, the API documentation also lists wait delay, dimensions, zoom, CSS-selector capture and cropping options. Those are separate from cookie and header syntax.

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Make a screenshot with one GET request (see the ScreenshotNeo API documentation):

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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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Frequently Asked Questions

Does ScreenshotMachine have a separate CLI executable?

The reviewed official documentation shows a Bash/cURL way to call its HTTP API, not a separate ScreenshotMachine CLI executable.

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Can I use a cookie banner option to authenticate a screenshot?

No. The documented hide option affects page elements; authentication cookies are passed separately through cookies.

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