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Convert to TopoJSON

Convert DGN to TopoJSON

Convert DGN (.dgn) to TopoJSON (.topojson, .json) online for free. Fast, accurate geospatial format conversion with CRS reprojection.

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Upload your DGN file and get TopoJSON output in seconds.

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About DGN

DGN (Design) is a CAD file format used by Bentley MicroStation for 2D and 3D design data. It is common in civil engineering and infrastructure projects.

Extensions: .dgn

Software: MicroStation, QGIS, AutoCAD, GDAL/OGR, Global Mapper

Limitations: Limited to Point, LineString, and Polygon geometries. No custom attributes. Complex element types may not convert.

About TopoJSON

TopoJSON is an extension of GeoJSON that encodes topology, eliminating redundancy and reducing file size. Shared boundaries between features are stored only once.

Extensions: .topojson, .json

Software: D3.js, Mapbox, QGIS, GDAL/OGR, Leaflet

Limitations: Read-only in most GIS software. Requires conversion for editing. Less widely supported than GeoJSON.

How to Convert DGN to TopoJSON

Upload your DGN file (.dgn)
Review detected layers, features, and coordinate system
Select TopoJSON as your output format
Choose a target coordinate reference system (optional)
Click Convert and download your TopoJSON file

Frequently Asked Questions

How do I convert DGN to TopoJSON?

Upload your DGN file to ConvertGeoData, review the detected data, select TopoJSON as the output format, and click Convert. Your converted file will be ready to download in seconds.

Is the DGN to TopoJSON conversion free?

Yes! ConvertGeoData offers free conversions for all users. No account required for basic conversions. Sign up for a Pro or Business plan for higher limits.

Can I change the coordinate system during conversion?

Yes. ConvertGeoData automatically detects your source CRS and lets you reproject to any EPSG coordinate reference system during conversion.

What software can open TopoJSON files?

TopoJSON files can be opened with D3.js, Mapbox, QGIS, GDAL/OGR and more.