

Take programmatic screenshots of web pages from any website.
Screenshot API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
A free API to convert any URL into an image and automate your workflow today. Get your free API key and start today.
Details from abstractapi.com.

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Yes. The Screenshot API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Screenshot API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Screenshot API supports CORS, so front-end JavaScript can call it directly.
Yes. The Screenshot API is served over HTTPS, so it's safe to use in production.