All about FTN Files

The FTN file type is primarily associated with FORTRAN Source Code File.

FTN	File extension: FTN
	File type:	FORTRAN Source Code files

What is an FTN file?

FTN files mostly belong to FORTRAN Source Code File. Use our "Online FTN Text Viewer" below to analyze your FTN file and to see all text it contains.

How do you open FTN files?

You need a suitable software like FORTRAN Source Code File to open an FTN file. You need a suitable software like FORTRAN Source Code File to open an FTN file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your FTN file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FTN file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FTN Text Viewer

Choose your .ftn file to analyze

or drag and drop it here

Online File Viewer

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4 Steps to Open an Unknown .FTN File

Because .FTN files can come from different programs, they aren't universally openable.

Identify the Source: If received from a programmer or scientist, it is likely FORTRAN source code. If from a legacy bulletin board, it may be a FidoNet message.
Check the Header: Inspect the first bytes in a text editor or hex viewer:
- Readable code (PROGRAM, SUBROUTINE) implies a FORTRAN script.
- Binary data or "PK" suggests a compressed or proprietary format.
Use the Original Software: The original program is usually required; try GNU Fortran, Intel Fortran, or Notepad++. If uncertain, ask the sender.
Use this Webpage: Drag and drop the file into our viewer to detect the format, extract readable text or metadata, and preview when possible.

Technical Data for FTN File Extension

Related files:

exe, for

an ftn FORTRAN Source Code file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with FTN files

Associate the FTN file extension with the correct application.
Update your software that should actually open FORTRAN Source Code files. Because only the current version supports the latest FTN file format. Search, therefore, e.g. on the manufacturer website after an available FORTRAN Source Code File update.
To make sure that your FTN file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .FTN file online - secure, fast, and no downloads needed.