FDF File Type

- The quick facts

What are FDF files and how to open them

Are you having problems opening a FDF file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a FDF file?

FDF files have multiple uses, and Acrobat Forms Data Format Document is one of them.

Acrobat Forms Data Format Document

The .fdf file extension refers to a specific document file related to Adobe. FDF files are document files that can be opened or created using Adobe Acrobat reader. FDF means "forms data format". It is a form format specifically for .pdf files.

FDF files are fairly smaller than .pdf files because they mainly contain the form's field data and not the entire form. In other words, .fdf files only have the "contents" of the .pdf without the complete package. Some editorial managers in browsers use files with the .fdf extension to ensure that the file opens in Adobe Reader and not within the browser.

FDF file format is now popularly used as an attachment in spam messages. If you receive an attachment in your email and the size is relatively small, opening it is not advisable and is considered impractical. Large .fdf files should be virus-scanned first before opening them. You may resume downloading the .fdf file once you're done with the necessary security check. Converting the FDF file to PDF is also recommended to make the file more accessible.

How to open FDF files

We have identified one FDF opener that is compatible with this specific type of FDF file.

Programs that open Acrobat Forms Data Format Document files

Last updated: June 9, 2022

All known file formats using extension .FDF

While Acrobat Forms Data Format Document is a popular type of FDF-file, we know of 4 different uses of the .FDF extension. Different software may use files with the same extension for different types of data.

SEU Format Definition File

Used with Lattice Source Entry Utility, a tool used for creating role-playing games.

While we have not verified the apps ourselves yet, our users have suggested 10 different FDF openers which you will find listed below.

More file formats using the FDF extension

Through our research of FDF files, we know that the following formats exist. However, we have not yet analyzed them in detail, and we would love to hear from you if you have information about either of them.

Floppy Disk File Image

Origin Fitting Function Definition File

Various apps that use files with this extension

These apps are known to open certain types of FDF files. Remember, different programs may use FDF files for different purposes, so you may need to try out a few of them to be able to open your specific file.