HTML and URL to PDF API with templates and a free tier.
PDFFleet API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Yes. The PDFFleet API is listed in the Documents & Productivity 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 PDFFleet API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The PDFFleet API supports CORS, so front-end JavaScript can call it directly.
Yes. The PDFFleet API is served over HTTPS, so it's safe to use in production.