GEOO.APP

GeoJSON to GML

Convert GeoJSON to GML online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.

Features

Fast Conversion

Efficiently convert from GEOJSON to GML format

Data Security

All processing is done locally in your browser

Standard Format

Output standard GML format

geojson to gml

Convert geojson to gml online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.

Drag and drop files or folders, or click to upload

Related Tools

GML → GEOJSONSHP → GEOJSONKML → GEOJSONTOPOJSON → GEOJSONGEOPACKAGE → GEOJSONCSV → GEOJSONXLSX → GEOJSONGEOJSON → SHPGEOJSON → KMLGEOJSON → TOPOJSON

About

GeoJSON

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.

GML

GML (Geography Markup Language) is an XML-based geospatial data encoding standard defined by the Open Geospatial Consortium (OGC). GML provides rich geospatial data modeling capabilities, supporting complex geometry types, topology, coordinate reference systems, and spatiotemporal data. GML is widely used in European and government sectors, often for national spatial data infrastructures (SDI).

Conversion trade-offs

GeoJSON: limitations to know

  • Text format results in larger file sizes, not suitable for massive datasets
  • Does not support topology or spatial indexing

GML: what you gain

  • Rigorous standard suitable for government and enterprise data exchange
  • Powerful data modeling for complex geographic concepts

Why convert GeoJSON to GML?

Converting GeoJSON to GML 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 GML 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 GML output — entirely in your browser, so your data never leaves your device.

Frequently asked questions

Are my files uploaded to a server?

No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.

Is the GeoJSON to GML converter free?

Yes, completely free with no sign-up and no usage limits.

Are coordinate systems preserved when converting GeoJSON to GML?

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.

Can I convert multiple files at once?

Yes — drop several GeoJSON files at once and each one produces its own GML output.

GML at a glance

Key Features

  • OGC international standard with rigorous specification
  • Supports complex geometries, topology, and spatiotemporal data
  • Extensible Application Schema for domain-specific customization

Common Use Cases

  • Data exchange for national spatial data infrastructures (SDI)
  • Geographic data publishing by government and mapping agencies

How to Use

  1. 1

    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.

  2. 2

    The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.

  3. 3

    Download the GML file. Each input produces its own output, ready to use in your GIS, web map, or archive.