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Convert to FlatGeobuf

Convert KML to FlatGeobuf

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

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Upload your KML file and get FlatGeobuf output in seconds.

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About KML

Keyhole Markup Language (KML) is an XML-based format for displaying geographic data in Earth browsers like Google Earth. It supports styling, icons, and 3D features.

Extensions: .kml

Software: Google Earth, Google Maps, QGIS, ArcGIS, Cesium

Limitations: Requires WGS 84 (EPSG:4326). Can become very large for complex datasets. Limited attribute handling.

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.

How to Convert KML to FlatGeobuf

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

Frequently Asked Questions

How do I convert KML to FlatGeobuf?

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

Is the KML to FlatGeobuf 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 FlatGeobuf files?

FlatGeobuf files can be opened with QGIS, GDAL/OGR, Leaflet, OpenLayers and more.