GeoJSON to TopoJSON
Convert GeoJSON to compact TopoJSON — shared arcs, adjustable quantization, no upload.
Processing and data safety
Section titled “Processing and data safety”This tool runs entirely in your browser — your files are never uploaded to a server.
Input and output
Section titled “Input and output”- Formats: GeoJSON, TopoJSON
- Flow: GeoJSON → TopoJSON
How to use
Section titled “How to use”- Paste your GeoJSON into the input box (a sample is preloaded) or drop/select a .geojson/.json file — the input renders on the map preview so you can eyeball shared edges.
- Optionally adjust the quantization factor (default 100000).
- Click “Convert to TopoJSON”.
Key details and limits
Section titled “Key details and limits”- Requires consistent topology in the input.
- Attributes are preserved as-is.
- Quantization is user-settable (default 1e5): larger factors keep more precision and share fewer arcs; the grid step is disclosed per input extent.
Common use cases
Section titled “Common use cases”- Paste GeoJSON → get TopoJSON