What is a GML file?
A .GML file is most often a Geography Markup Language file. The Open Geospatial Consortium (OGC) created this format to store geographic data. These files contain map coordinates, geometric features, and geospatial metadata.
Because the .GML extension has multiple possible meanings, your file might be something else. It can be a Graph Modelling Language file used by Gephi or yFiles to store network graphs. It can also be a GameMaker Language File used by Yoyo Games for game development scripts. Finally, it might be a Gerber Mill Layer File from Ucamco. If you are unsure, we recommend viewer.online/gml to identify the actual format of the user's file.
How to open GML files?
To open geospatial .GML files, you can use specialized GIS software like ArcGIS or FME Desktop. If you have a GameMaker Language File, you need the game engine software from Yoyo Games.
If you do not have these tools installed, viewer.online/gml analyzes .GML files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Best practices and troubleshooting
Geographic .GML files can become very large and slow to process. You can often compress them or convert them to more common web formats. We recommend file conversion to sensible target formats like .GEOJSON, .KML, or .CSV on convert.guru.
If you work with command-line tools, you can use GDAL (Geospatial Data Abstraction Library) to read, translate, and manage geographic .GML files quickly.
Summary
The Geography Markup Language stores important mapping data, while other .GML files store network graphs or game code. Because .GML files use the known XML format, viewer.online/gml can safely open and display them online, eliminating compatibility problems.