DocRaptor

DocRaptor is a hosted HTML-to-PDF conversion API, built on the Prince PDF engine. A caller sends HTML and CSS to the REST interface and receives a PDF, and the security and privacy page names DocRaptor, LLC as the contracting entity, now part of the Artifex Software group. Accounts are on monthly plans based on usage, with a free plan that allows no overage. The documentation lists limits on generation time, simultaneous requests and documents per billing period, and no hard limits on the number of pages or the size of input and output.

Worth knowing

Rendering runs on AWS in the us-east-1 region, which the security page states. A site or app that calls the service depends on that infrastructure and on the document limits of its plan.