The Leadtools.Pdf.Annotations library contains a convertor for PDF objects to/from Leadtools.Pdf.PDFAnnotation and Leadtools.Annotations.Engine.AnnContainer.
PDF Convertor
The convertor feature in Leadtools.Pdf.Annotations supports converting to/from Leadtools.Pdf.PDFAnnotation and Leadtools.Annotations.Engine.AnnContainer objects for PDF page editing and saving. This feature is not supported in JavaScript.