https://pdfswitch.io/ is a high-quality, easy to implement HTML to PDF conversion API. Easily generate PDF invoices, tickets, reports and documents with HTML to PDF API. Lightning-fast service, rich features, code samples for Java, C#, PHP, Python, Ruby, Go, Nodejs.
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
HTML2PDF.fr - HTML2PDF is a HTML to PDF converter that allows the conversion of valid HTML 4.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
Docamatic - Easily generate high quality PDF documents from HTML or templates. Fast, scalable and privacy focused PDF generation API.