Extract text from GFC files
To convert your GFC file to another format, you need ICGEM Calculation Service or other GIS software.
To convert other file formats to the "Geodetic Data File" file type, you need software like ICGEM Calculation Service or a similar tool.
The .gfc extension is shared primarily by two very different file types, creating frequent confusion. The most common use (approx. 40%) is for Gravity Field Coefficient files, a specialized text-based scientific format defined by the ICGEM (International Centre for Global Earth Models). These files contain spherical harmonic coefficients used to model the Earth's gravitational field. While they are technically plain text, the data is unstructured for standard spreadsheet software, often requiring specialized tools like Generic Mapping Tools (GMT) or MATLAB to parse or visualize. Users typically need to convert these into standard CSV, Excel, or JSON formats to actually analyze the coefficients without writing custom scripts.
Alternatively, a .gfc file may be a legacy flowchart created by Patton & Patton FlowCharter, a diagramming tool popular in the 1990s and early 2000s. These files are proprietary vector diagrams that are virtually impossible to open on modern operating systems like Windows 10 or 11 due to the software's discontinuation. Users with these archives face a significant "digital rot" problem and must urgently convert them to PDF or standard image formats like PNG or SVG to preserve the organizational charts or process maps contained within. Less frequently, .gfc files appear as game cache assets for engines like those used in Doom 3 or S.T.A.L.K.E.R., though these are generally internal binary blobs not meant for manual conversion.
Convert.Guru analyzes your GFC file, detects the exact format, and lets you read the text inside.
Users also converted CFG, GPX, RSF and FMA files.
If you want to convert GFC file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use ICGEM Calculation Service or similar software from the "Gravity Field Model Data" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to GFC, try ICGEM Calculation Service or another comparable tool in the "Gravity Field Model Data" 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 GFC converter.