Convert KMZ to FGB

Turn KMZ (zipped KML) data into FlatGeobuf — 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 KMZ (zipped KML) (KMZ)

KML in a zip container — the compact form Google Earth saves and shares. Identical content to KML, a fraction of the size.

Worth knowing: Same constraints as KML; embedded images/models inside the archive are passed through, not converted.

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.

How the conversion works

Drop your KMZ 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 FGB result, with a transformation report showing exactly what was done.