Convert FlatGeobuf to GeoJSON Online — Free & Instant
Converting FlatGeobuf to GeoJSON makes your binary FlatGeobuf data compatible with web maps, JavaScript applications, and GitHub rendering. GeoJSON is the universal language of web mapping and the format consumed by Leaflet, Mapbox GL JS, Turf.js, and D3.js.
File converter
When to convert FlatGeobuf to GeoJSON
- Converting FlatGeobuf data to GeoJSON for use in Leaflet or Mapbox GL JS
- Exporting FlatGeobuf layers from QGIS to GeoJSON for GitHub map rendering
- Converting .fgb cloud data to GeoJSON for JavaScript processing with Turf.js
How to convert FlatGeobuf to GeoJSON
- 1
Upload your FlatGeobuf
Drop your .fgb file on the upload zone.
- 2
Select GeoJSON
Click GeoJSON in the format selector.
- 3
Download and use
Load into Leaflet, Mapbox GL JS, or upload to GitHub for automatic map rendering.
About FlatGeobuf
FlatGeobuf is a modern, high-performance binary format for geospatial vector data, designed for efficient streaming and cloud-native workflows. Based on FlatBuffers, it supports random access via HTTP range requests, making it ideal for serving large datasets directly from object storage like S3 without a tile server. FlatGeobuf is an OGC Community Standard and is supported by GDAL 3.1+, QGIS, Mapbox, and the GeoJSON ecosystem. Its compact binary encoding is significantly faster to parse than GeoJSON for large datasets.
Strengths
- +Extremely fast read/write — binary encoding
- +Supports HTTP range requests for cloud-native access
- +OGC Community Standard
- +Compact — much smaller than equivalent GeoJSON
About GeoJSON
GeoJSON is an open standard geospatial data format based on JSON, defined in RFC 7946. It supports all geometry types (Point, LineString, Polygon, MultiPolygon, etc.) and arbitrary properties per feature. GeoJSON is the preferred format for web mapping because browsers can parse it natively and libraries like Leaflet, Mapbox GL, and D3 consume it directly. GitHub renders GeoJSON files on a map automatically. It uses WGS 84 (EPSG:4326) as its coordinate reference system.
Strengths
- +Native browser support (JSON)
- +Human-readable and editable
- +Single file — easy to share
- +First-class support in web mapping libraries
Frequently asked questions
Q.Are all FlatGeobuf attributes preserved in GeoJSON?
Yes. All feature attributes from the FlatGeobuf are exported as GeoJSON feature properties.
Q.What CRS does the output GeoJSON use?
GeoJSON uses WGS 84. If your FlatGeobuf uses a different CRS, Maparz reprojects it automatically.