Convert FGB to GeoJSONSeq

Turn FlatGeobuf data into GeoJSON Sequence — free, instant, and entirely in your browser, with optional reprojection to any of 200+ coordinate systems.

No upload. No account. Your data stays on your machine.

Drop your files here or click to browse.

Shapefile (all parts or .zip), GeoJSON, KML/KMZ, GPKG, GPX, DXF, CSV, TAB and more — files never leave your browser.

Output format

Output coordinate system (optional)

Source CRS override (for CAD/CSV without one)

About FlatGeobuf (FGB)

A modern binary format built for streaming and HTTP range requests — very fast, spatially indexed, cloud-native.

Worth knowing: Single layer per file.

About GeoJSON Sequence (GeoJSONSeq)

Newline-delimited GeoJSON features — streamable and appendable, good for pipelines.

Worth knowing: One feature per line; not all viewers understand it.

How the conversion works

Drop your FGB file above.
We read it locally with GDAL compiled to WebAssembly — nothing is uploaded.
Optionally pick an output coordinate system; official datum grids are applied automatically.
Download your GeoJSONSeq result, with a transformation report showing exactly what was done.