Convert GeoJSON to GMT online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from GEOJSON to GMT format
All processing is done locally in your browser
Output standard GMT format
Convert geojson to gmt online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
GeoJSON is a geospatial data interchange format based on JSON. It can represent Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection geometries. Defined by RFC 7946, GeoJSON has become one of the most popular data exchange formats in web GIS. GeoJSON files use WGS84 coordinates and support Feature objects with associated properties and FeatureCollections for organizing multiple features.
GMT ASCII Vectors is a text-based vector data format used by Generic Mapping Tools (GMT) software. GMT is widely used in earth science research and academic paper map making. The GMT format records geographic features as text lines, each containing coordinates and optional attribute information.
Converting GeoJSON to GMT is one of the most common workflows in GIS. GeoJSON data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while GMT is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your GeoJSON files, keeps geometry and attributes intact, and writes clean GMT 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 GeoJSON 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 GeoJSON files at once and each one produces its own GMT output.
Upload your GeoJSON 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 GMT file. Each input produces its own output, ready to use in your GIS, web map, or archive.