Convert TopoJSON to CSV

Turn TopoJSON data into CSV (with coordinates) — 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 TopoJSON (TopoJSON)

GeoJSON's topology-preserving sibling — shared boundaries stored once, much smaller files.

Worth knowing: Read-only here: we convert from TopoJSON, not to it.

About CSV (with coordinates) (CSV)

Plain-table points: columns for X/Y (or easting/northing, lon/lat) become geometry.

Worth knowing: Point data only on read (X/Y columns); geometry of other types is written as WKT.

How the conversion works

Drop your TopoJSON 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 CSV result, with a transformation report showing exactly what was done.