Convert TopoJSON to FlatGeobuf
Convert TopoJSON (.topojson, .json) to FlatGeobuf (.fgb) online for free. Fast, accurate geospatial format conversion with CRS reprojection.
About TopoJSON
TopoJSON is an extension of GeoJSON that encodes topology, eliminating redundancy and reducing file size. Shared boundaries between features are stored only once.
About FlatGeobuf
FlatGeobuf is a performant binary encoding for geographic data based on FlatBuffers. It supports streaming and random access for fast partial reads.
How to Convert TopoJSON to FlatGeobuf
- Upload your TopoJSON file (.topojson, .json)
- 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
Upload your TopoJSON 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.
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.
Yes. ConvertGeoData automatically detects your source CRS and lets you reproject to any EPSG coordinate reference system during conversion.
FlatGeobuf files can be opened with QGIS, GDAL/OGR, Leaflet, OpenLayers and more.
Convert TopoJSON to FlatGeobuf Now
No installation required. Works in your browser.