Convert GPX to TopoJSON online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from GPX to TOPOJSON format
All processing is done locally in your browser
Output standard TOPOJSON format
Convert gpx to topojson online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
GPX (GPS Exchange Format) is an XML-based GPS data exchange format and the de facto standard for exchanging data between GPS devices and applications. GPX supports three core data types: Waypoints (single location points), Routes (ordered path point sequences), and Tracks (GPS-recorded point sequences with timestamps). GPX files can be generated by various GPS devices, sports watches, and mobile apps.
TopoJSON is a GeoJSON extension developed by Mike Bostock that encodes topology to eliminate redundant shared boundaries. Unlike GeoJSON where each polygon independently stores all vertices, TopoJSON uses arcs to share common boundaries between adjacent features, reducing file sizes by over 80%. TopoJSON is particularly suited for rendering large numbers of adjacent areas such as administrative district maps.
Converting GPX to TopoJSON is one of the most common workflows in GIS. GPX data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while TopoJSON is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your GPX files, keeps geometry and attributes intact, and writes clean TopoJSON output — entirely in your browser, so your data never leaves your device.
No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.
Yes, completely free with no sign-up and no usage limits.
By default the output keeps the source coordinate system. If your GPX file uses a projected CRS (like UTM), you can search any EPSG coordinate system by keyword or code and reproject in one step. Note: output formats that require WGS84 by specification (KML, KMZ, GPX) always reproject to WGS84 automatically.
Yes — drop several GPX files at once and each one produces its own TopoJSON output.
Upload your GPX file — drag and drop it onto the page, or browse from your device. You can add several files at once for batch conversion.
The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.
Download the TopoJSON file. Each input produces its own output, ready to use in your GIS, web map, or archive.