Forms Document (Adobe Acrobat)
FDF is a text file format used by Adobe Acrobat. FDF files are used for text files exported from .PDF files. FDF files are smaller than .PDF files because they only contain the form field data, and not the entire form. FDF files can be created by selecting “Advanced” from the Adobe Acrobat menu bar. In recent years, .FDF files have become popular in spam emails.
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