Extract text from Fortran source files (FTN)
To convert FTN Fortran files to another format, you need GNU Fortran or other Developer software.
To convert other file formats to the "Source Code File" file type, you need software like GNU Fortran or a similar tool.
The .ftn file extension primarily identifies a Fortran Source Code file. Fortran is a legacy programming language historically used in heavy scientific, mathematical, and engineering computations. These files contain raw, human-readable text instructions. Less commonly, an .ftn file operates as a Flowton Diagram file, which stores visual charts created in the Flowton application.
The main disadvantage of Fortran .ftn files is that they are raw code. They cannot be executed directly and require a compiler like GNU Fortran to function. Furthermore, older Fortran files use strict fixed-format layouts that confuse modern code editors. If your .ftn file is a Flowton Diagram, it suffers from being a closed, proprietary format. Standard online converters fail to process Flowton files because the internal data structure is undocumented and requires a specific, often obsolete, software license to open.
Users frequently need to convert Fortran files into more accessible formats for review or modernization. The best conversion targets are TXT for basic reading, MD for documentation, or C if you are attempting to translate the logic into a modern language. Converting code often requires manual rewriting, as automated translation tools frequently break complex mathematical logic.
Flowton diagram files are notoriously difficult to open or convert. Often only the original software can properly read or export the visual data. Our engine will inspect the file and show text or internal content. If our analysis detects a supported underlying or embedded text format, viewing or conversion may still be possible.
Convert.Guru analyzes your FTN file, detects the exact format, and lets you read the text inside.
If you want to convert FTN file to , you can use GNU Fortran or similar software from the "Source Code and Diagrams" category. In the File menu, look for Save As… or Export….
To convert files to FTN, try GNU Fortran or another comparable tool in the "Source Code and Diagrams" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our FTN converter.