The File Extensions Database

.FDF File Extension

  • Developer by: Adobe Systems
  • Category: Text Files

What is an .FDF file?

.FDF is Acrobat Forms Data Format

Text file format used for data exported from .PDF form fields; typically smaller than PDF files, because they only contain form field data, not the entire form; can be created in Acrobat by selecting Advanced→Forms→Export Forms Data from the menu bar.

FDF files are commonly processed on Web servers by .CGI scripts.

Programs that open Acrobat Forms Data Format
Adobe Acrobat DC
Adobe Acrobat DC
File Type 2 Origin Fitting Function Definition File
Developer by: OriginLab Category: Data Files Format: Text

An FDF file is a mathematical fitting function definition file used by Origin, a data analysis and graphing application used by various scientists and engineers. It contains all the properties about a fitting function, such as the function type, constraints, fitting parameters, a function expression, variables, and a description. FDF files may come included with Origin or be user-defined.

User-defined FDF files are created using the Fitting Function Builder in Origin. You can access the tool by selecting Tools → Fitting Function Builder.... Choose "Create a New Function" to create an FDF file or "Edit a User-defined Function" to edit an FDF file. You can also view your FDF files by selecting Tools → Fitting Function Organizer.... You can also open FDF files with a text editor since the fitting function definition is stored in plain text.

FDF files that come packaged with the program are located in the "FitFunc" subfolder of the Origin program folder. However, user-defined FDF files are typically saved in the "FitFunc" subfolder of the "User Files" folder in the Origin program folder.

Programs that open Origin Fitting Function Definition File
OriginLab Origin

How to solve problems with FDF files

  • Associate the FDF file extension with the correct application. On :
    Windows: Right click on any FDF file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.FDF files". Mac: Right click (or Ctrl-click) the FDF file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .FDF is Acrobat Forms Data Format. Because only the current version supports the latest FDF file format. Search, therefore, e.g. on the Adobe Systems manufacturer website after an available .FDF is Acrobat Forms Data Format update.
  • To make sure that your FDF file is not corrupted or virus-infected, get the file again and scan it with antivirus software.