Convert FlatGeobuf to GeoJSON online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from FGB to GEOJSON format
All processing is done locally in your browser
Output standard GEOJSON format
Convert fgb to geojson online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
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.
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 modern format designed for very large datasets: streamed reading, a spatial index, and compact binary storage make it ideal for distributing big layers. When that data needs to reach web maps, APIs, or colleagues who only know JSON, converting FGB to GeoJSON is the bridge — every feature comes out with geometry and properties intact, ready for any tool that speaks GeoJSON.
A single-file binary geospatial format (extension .fgb) optimized for fast streaming reads and spatial indexing, used increasingly for large open datasets.
Yes — FlatGeobuf's layout is built for efficient reading, and conversion runs locally so throughput depends on your machine, not a server.
Yes — points, lines, polygons, and their multi-variants are converted to the matching GeoJSON geometry.
Upload your FlatGeobuf 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 GeoJSON file. Each input produces its own output, ready to use in your GIS, web map, or archive.