PDFium is described as 'is Google's PDF generation and rendering library. It's used in Chrome for displaying PDFs and print preview and on Android for PDF rendering' and is an app in the Development category. There are more than 10 alternatives to PDFium for a variety of platforms, including Windows, Online / Web-based, Linux, Mac and Self-Hosted solutions. The best alternative is Document Cyborg. It's not free, so if you're looking for a free alternative, you could try HTML2PDF or PDF-LIB. Other great apps like PDFium are HTML to PDF Converter Library for .NET (Paid), PDFSwitch (Free Personal), Pdfcrowd (Paid) and Aspose.PDF for Java (Paid).