Convert GeoJSON to FlatGeobuf online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from GEOJSON to FGB format
All processing is done locally in your browser
Output standard FGB format
Convert geojson to fgb online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
GeoJSON is a geospatial data interchange format based on JSON. It can represent Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection geometries. Defined by RFC 7946, GeoJSON has become one of the most popular data exchange formats in web GIS. GeoJSON files use WGS84 coordinates and support Feature objects with associated properties and FeatureCollections for organizing multiple features.
FlatGeobuf is a geospatial data format based on FlatBuffers, designed for efficient geospatial data storage and transmission. It supports spatial indexing (based on Packed Hilbert Curve R-tree) enabling spatial filtering during reads, loading only data for the area of interest. FlatGeobuf is particularly suited for web applications and streaming processing scenarios requiring fast random access to large datasets.
Converting GeoJSON to FlatGeobuf is one of the most common workflows in GIS. GeoJSON data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while FlatGeobuf is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your GeoJSON files, keeps geometry and attributes intact, and writes clean FlatGeobuf output — entirely in your browser, so your data never leaves your device.
No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.
Yes, completely free with no sign-up and no usage limits.
By default the output keeps the source coordinate system. If your GeoJSON file uses a projected CRS (like UTM), you can search any EPSG coordinate system by keyword or code and reproject in one step. Note: output formats that require WGS84 by specification (KML, KMZ, GPX) always reproject to WGS84 automatically.
Yes — drop several GeoJSON files at once and each one produces its own FlatGeobuf output.
Upload your GeoJSON file — drag and drop it onto the page, or browse from your device. You can add several files at once for batch conversion.
The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.
Download the FlatGeobuf file. Each input produces its own output, ready to use in your GIS, web map, or archive.