What is a GSI file?
A .GSI file is a data format primarily used to store surveying measurement data. Most commonly, these files are generated by surveying instruments manufactured by Leica Geosystems. They contain raw measurements, coordinates, angles, and distances collected during land surveys. However, because the .GSI extension has multiple possible meanings, your file might also be a Golden Software Interchange File created by Golden Software for vector graphics, an Italian fiscal document archive (stored as a ZIP file), or even a game save file for the classic PC game *Arcanum*.
How to open GSI files?
Surveying professionals typically open .GSI files using specialized desktop software like Leica Geo Office or Leica Infinity. If you have a Golden Software Interchange File, you can use mapping and graphing programs like Surfer or Grapher. Because Leica .GSI files are often simple text-based coordinate lists, you can sometimes inspect them with basic text editors like Notepad on Windows or TextEdit on macOS.
File Conversion
To use .GSI measurement data in modern CAD or GIS systems, you often need to convert it. We recommend using convert.guru to transform your .GSI files into widely supported formats like .CSV, .DXF, or .TXT. This ensures smooth import into software like AutoCAD or QGIS.
Best practices and troubleshooting
When you receive an unknown .GSI file, do not assume it is a standard surveying file. Because the extension is shared by completely different programs, guessing the format can lead to software errors. Instead, viewer.online/gsi can analyze .GSI files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Summary
viewer.online/gsi is the easiest way to identify, inspect, and understand .GSI files without installing software or dealing with compatibility problems. Whether you have Leica surveying data, a Golden Software graphics file, or an unknown archive, our tool helps you quickly uncover the file's contents directly in your browser.