Convert FlatGeobuf to GML

Convert FlatGeobuf (.fgb) to GML (.gml) online for free. Fast, accurate geospatial format conversion with CRS reprojection.

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Upload your FlatGeobuf file and get GML output in seconds.

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About FlatGeobuf

FlatGeobuf is a performant binary encoding for geographic data based on FlatBuffers. It supports streaming and random access for fast partial reads.

Extensions: .fgb

Software: QGIS, GDAL/OGR, Leaflet, OpenLayers, GeoServer

Limitations: Relatively new format with limited support in older software. Single layer per file.

About GML

Geography Markup Language (GML) is an OGC XML-based format for expressing geographic features. It is often used for data exchange between government agencies and in INSPIRE-compliant systems.

Extensions: .gml

Software: QGIS, ArcGIS, GeoServer, Deegree, GDAL/OGR

Limitations: Verbose XML format — large file sizes. Complex schema definitions. Slower to read/write than binary formats.

How to Convert FlatGeobuf to GML

Upload your FlatGeobuf file (.fgb)
Review detected layers, features, and coordinate system
Select GML as your output format
Choose a target coordinate reference system (optional)
Click Convert and download your GML file

Frequently Asked Questions

How do I convert FlatGeobuf to GML?

Upload your FlatGeobuf file to ConvertGeoData, review the detected data, select GML as the output format, and click Convert. Your converted file will be ready to download in seconds.

Is the FlatGeobuf to GML conversion free?

Yes! ConvertGeoData offers free conversions for all users. No account required for basic conversions. Sign up for a Pro or Business plan for higher limits.

Can I change the coordinate system during conversion?

Yes. ConvertGeoData automatically detects your source CRS and lets you reproject to any EPSG coordinate reference system during conversion.

What software can open GML files?

GML files can be opened with QGIS, ArcGIS, GeoServer, Deegree and more.