GeoJSON to TopoJSON Converter
Convert GeoJSON (.geojson) files to TopoJSON (.topojson) right in your browser — free, instant and private. Drop a file below and download the result in seconds. Nothing is uploaded to a server, so your data never leaves your device.
Drag & drop your .geojson file
or click to browse
How to convert GeoJSON to TopoJSON
- 1
Add your GeoJSON file
Drag and drop your .geojson file onto the box above, or click to browse — you can also paste the raw text directly.
- 2
Convert in your browser
GeoMaps reads the GeoJSON and rewrites it as TopoJSON locally, on your device. The conversion is instant and your file is never sent anywhere.
- 3
Download your TopoJSON
Click download to save the converted .topojson file, or copy the output text. That's it — no account, no watermark, no limits.
GeoJSON is an open standard (RFC 7946) for representing geographic features — points, lines and polygons — together with their attributes as plain JSON. It's the lingua franca of modern web mapping: readable by virtually every GIS tool, library (Leaflet, Mapbox GL, OpenLayers, deck.gl) and programming language out of the box. Its simplicity and human-readability make it the natural hub format to convert to and from.
Need the other direction instead? TopoJSON is a compact GeoJSON extension that encodes shared topology. TopoJSON is an extension of GeoJSON that encodes topology: shared boundaries between features are stored once as 'arcs' instead of being duplicated. The result is dramatically smaller files — often 80% smaller than the equivalent GeoJSON — which makes it popular for web visualizations (notably D3.js) where download size matters. It converts losslessly back to GeoJSON for editing.
What is GeoJSON?
.geojsonGeoJSON is an open standard (RFC 7946) for representing geographic features — points, lines and polygons — together with their attributes as plain JSON. It's the lingua franca of modern web mapping: readable by virtually every GIS tool, library (Leaflet, Mapbox GL, OpenLayers, deck.gl) and programming language out of the box. Its simplicity and human-readability make it the natural hub format to convert to and from.
What is TopoJSON?
.topojsonTopoJSON is an extension of GeoJSON that encodes topology: shared boundaries between features are stored once as 'arcs' instead of being duplicated. The result is dramatically smaller files — often 80% smaller than the equivalent GeoJSON — which makes it popular for web visualizations (notably D3.js) where download size matters. It converts losslessly back to GeoJSON for editing.
GeoJSON to TopoJSON — FAQ
- How do I convert GeoJSON to TopoJSON?
- Upload your .geojson file using the converter above (drag & drop or click to browse). GeoMaps converts it to TopoJSON instantly in your browser and gives you a .topojson file to download. No software to install and no signup required.
- Is the GeoJSON to TopoJSON converter free?
- Yes — it's completely free with no usage limits, watermarks or account needed. We offer it as a free tool from GeoMaps, the platform for turning your data into interactive maps.
- Is my data private? Are my files uploaded to a server?
- No. The conversion runs entirely in your web browser using JavaScript — your file is never uploaded to any server. Because nothing leaves your device, it's safe for sensitive or confidential data and works even offline once the page has loaded.
- Can I convert TopoJSON back to GeoJSON?
- Yes. Use our TopoJSON to GeoJSON converter for the reverse conversion — every format on GeoMaps converts both ways.
- How large a file can I convert?
- Because conversion happens in your browser, the limit is your device's memory rather than a server quota — files up to tens of megabytes convert comfortably on a typical laptop. Very large datasets may be slower depending on your machine.