path of the input PDF file. The default is set to
NULL. IF NULL, it  prompt the user to select the folder interactively.</p></td>
    </tr>
    <tr>
      <th>convert_field_names</th>
      <td><p>By default <code>pdftk</code> will encode certain characters
of the field names in plain text UTF-8 so if using a non-latin alphabet, your
field names might be illegible. Setting this to TRUE will turn the UFT-8 code into
characters. However this process it not guaranteed to be perfect as pdftk does
not differenti