FileStar - With FileStar you can "do anything with any file".
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
NordLocker - Keeping files in the cloud? Protect them with leading-edge encryption. NordLocker makes file security easy.
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
Storj.io - Storj DCS is a decentralized, encrypted and fast Amazon S3-compatible object storage.
PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.