Use this code to programmatically determine if a PDF document is an AcroForm: bool hasAcroFormFields = false;if(doc.Root.Contains("AcroForm")){var AcroFormDict = doc.Root.Get("AcroForm") as PDFDict;hasAcroFormFields = AcroFormDict.Contains("Fields") ... Read More

Types of PDF Forms There are three primary types of PDF forms, each with distinct characteristics and use cases:   1. AcroForms Traditional and most common type of PDF forms. Created using tools like Adobe Acrobat.   2. Static XFA PDF Forms ... Read More

Using the Adobe PDF Library, you can access the XML structure behind an XFA form field. XFA, or XML Forms Architecture, is a set of proprietary XML specifications for use with web forms. XFA forms are saved within a PDF document. If you want to merge... Read More

Dynamic XFA PDF forms contain backup placeholder content in addition to the XFA data describing the fields and content of the form. The placeholder content can vary but is typically a warning to upgrade or use Adobe Reader.  When a dynamic XFA PDF... Read More

A Forms Data Format (FDF) file is a text file used by Adobe Acrobat to hold values exported from PDF forms documents. The Adobe PDF Library views an FDF file as a COS document. As such, it can be opened by the Adobe PDF Library, and can be used with... Read More