To follow on with this, I've used https://pdfcrowd.com/ too. - Source: Reddit / about 2 months ago
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
Document Cyborg - Easily save a web page as a document (PDF, WORD, EPUB, ODT, RTF or Text)
PDF my URL - PDFmyURL turns any webpage or even complete website into PDF. Use our rest API in PHP, .NET, Ruby, Perl or any other programming language. Or convert webpages or even full websites directly in the browser!
Api2Pdf - PDF Generation API, powered by AWS Lambda. HTML to PDF | URL to PDF | Office Doc to PDF | Merge PDFs . Supports wkhtmltopdf, Headless Chrome, and LibreOffice. No rate limits and no file size limits.
HTML2PDF Rocket - Reliable and secure HTML to PDF convertor. Code examples for C#, Ruby, ASP.NET and PHP and more. Easy to use and amazingly fast, free of cost!