HTML and CSS to PDF with page headers, footers and page numbers, no headless browser.
pdfrender API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
pdfrender API reference: endpoints, parameters and examples, with the machine-readable OpenAPI spec at /openapi.json.
Details from pdfrender.dev.

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HTML and URL to PDF API with templates and a free tier
The pdfrender API is provided by pdfrender (pdfrender.dev). pdfrender API reference: endpoints, parameters and examples, with the machine-readable OpenAPI spec at /openapi.json.
Yes. The pdfrender 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 pdfrender API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the pdfrender API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The pdfrender API is served over HTTPS, so it's safe to use in production.