Bear in mind that you’ll need to either embed all your resources, or only use CORS-enabled resources, or fake the origin for your HTML document so that it can access non-CORS-enabled resources on a particular domain.

Encoding your HTML as a data: URI might work for this service as-is (provided you use no non-CORS-enabled resources). Haven’t tried it.

We can easily add this feature. So you'd like to pass a single HTML file?

So something like wkhtmltopdf?