View FlatGeobuf files in your browser
A fast binary format for map features, made to be read straight from the web. Open an FGB right here on a map. The file never leaves your device.
Or drop it anywhere on this page
What you'll see
Your file opens on a map, framed to fit, its layers drawn over OpenStreetMap's streets and what it holds listed beside it.
- OpenStreetMap, dark or light • Flat or a globe
- Every layer and feature in a list • Search their names and fields
- Click a feature for its fields • Measure distances
- Export • PNG, GeoJSON, GPX, KML and CSV
About FlatGeobuf
Björn Harrtell started FlatGeobuf in 2019 as a quick, compact way to store map features that a browser can read straight from a web server. GDAL, QGIS, DuckDB and web map libraries read and write it.
An FGB holds a header naming its columns and coordinate system, a spatial index packed as a Hilbert R-tree, then the features, each a FlatBuffers record of its shape and its values.
Filepeek reads the header and the features in your browser with its own reader, moves them into longitude and latitude, and draws them over OpenStreetMap. Click a feature for its columns, search them, and save the features as GeoJSON, KML, GPX or CSV.
FlatGeobuf
.fgb
Format
- MIME type
- application/flatgeobuf
- Made by
- Björn Harrtell and its contributors
- Released
- 2019
Inside the file
- Holds
- Features with columns
- Index
- A packed Hilbert R-tree
- System
- Named in the header
- Built on
- FlatBuffers
Opens in every browser
Filepeek opens FlatGeobuf files on a map in Chrome, Edge, Firefox and Safari. On their own, browsers download them.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open FlatGeobuf
- WindowsQGIS
- MacQGIS
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I open an FGB file?
Drop it on this page or choose Peek a FlatGeobuf. Its features open on a map, listed beside it.
Can I convert FlatGeobuf to GeoJSON?
Yes. Open it, choose Export, then Save the features as GeoJSON, KML, GPX or CSV.
How big a file can it open?
Filepeek draws up to 3 million points on a computer and 750,000 on a phone, and Show details says when it left features out.