Convert TopoJSON to DGN

Turn TopoJSON data into MicroStation DGN — 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.

Bentley MicroStation design files (v7). Common in civil and infrastructure work.

Worth knowing: V7 only in-browser; like all CAD, no CRS metadata — assign the source CRS.

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 DGN result, with a transformation report showing exactly what was done.