.XFDF File Extension
File TypeAdobe Acrobat XFDF File
What is an XFDF file?
XML Forms Data Format (XFDF) file created by Adobe Acrobat, a PDF authoring application; stores descriptions of page form elements and their values, such as the names and values for text fields; used for saving form data that can be imported into a PDF document.
XFDF files are similar to .FDF files, except XFDF files have a newer format that uses XML formatting.