Click the "Select File" button above, and choose your FSI file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert FSI to another file type
To convert your FSI file to another format, you need FormFusion or other Data software.
Convert a file to FSI
To convert other file formats to the "Integration Script" file type, you need software like FormFusion or a similar tool.
About FSI files
The .FSI filename extension is a "chameleon" format used by three completely different industries, making it a frequent source of confusion.
FormFusion Script Integration File (41%): Most commonly, this is a proprietary configuration file used by Formtran FormFusion software. These files act as middleware scripts that map raw database output (often from ERPs) to formatted document designs. Because they utilize the Microsoft Compound binary format (similar to old DOC files), they are not human-readable in standard text editors. Users often need to convert these to TXT to inspect the logic or recover lost mapping configurations without requiring the expensive enterprise software environment.
Festo Automation Package (16%): In industrial automation, an .FSI file is a software package for the Festo Automation Suite. These files contain device drivers, firmware, and plugin configurations for servo drives and valve terminals. Practicaly speaking, these are often just renamed ZIP archives. Engineers commonly struggle with issues when trying to inspect a package's contents without the full 1GB+ automation suite installed. Changing the extension to ZIP allows for immediate extraction.
Visual F# Signature File (0.9%): For developers, this is a plain text file used in F# programming to define public signatures (types and namespaces), similar to a header file (H) in C++. These can be opened directly in Visual Studio Code.
Convert.Guru analyzes your FSI file, detects the exact format, and lets you read the text inside.
If you want to convert FSI file to JS, TS, PY, JAVA, CPP, C, CS, PHP, RB, GO, RS or SWIFT, you can use FormFusion or similar software from the "FormFusion Script Integration" category. In the File menu, look for Save As… or Export….
To convert SH, PY, KT, PS1, SWIFT, LUA, PL, JAVA, SCALA, JS, VBS or TS files to FSI, try FormFusion or another comparable tool in the "FormFusion Script Integration" category.
The FSI Converter Story
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 FSI converter.