Convert GML to GeoJSON online
Convert Geography Markup Language (GML) — the OGC XML standard used by INSPIRE and many government open-data portals — into GeoJSON, which is the open, web-native JSON format read by Leaflet, Mapbox and virtually every modern GIS tool. Drop your GML file below, GeoJSON is already selected as the output, and download the result. Everything runs in your browser and the cloud; you never install anything.
Upload your file
Drag and drop it into the converter below. A free account comes with three welcome conversions.
Convert in the cloud
MapGO detects the format and produces your download in seconds.
Download & keep it
Files are deleted automatically after 48 hours.
Files are deleted automatically after 48 hours. Your files are never shared.
Why convert GML to GeoJSON with MapGO?
Most online converters take one file and hand back one file. MapGO is built on a real geospatial engine, so a single upload can do more.
- Several outputs in one upload
Tick GeoJSON and any other formats you need; every selected format is delivered from the same file.
- Files up to 5 GB
Far beyond the browser-based converters that choke past a few hundred megabytes.
- Reproject while you convert
Set a source and target EPSG code and the coordinate system is changed during the conversion, no second tool needed.
- Private by default
Files are deleted automatically after 48 hours.
GML vs GeoJSON at a glance
| GML | GeoJSON | |
|---|---|---|
| Typical use | Government/INSPIRE open-data portals and OGC web services | Web maps and APIs (Leaflet, Mapbox, D3); human-readable data in git |
| Size on disk | Very verbose XML | Verbose plain text — the largest of the common formats, but gzips well |
| Attribute support | Rich, schema-driven attribute definitions | Flexible JSON properties — nesting and arrays allowed |
| Software support | GDAL-based GIS tools; rarely opened directly | Every modern GIS tool and every web mapping library |
| Web-friendliness | Poor — convert to GeoJSON or FlatGeobuf first | Excellent — the native format of web mapping |
Other ways to convert GML to GeoJSON
You don't need an online tool for this. If you have GDAL installed, one command does it.
In QGIS (free): open your GML via Layer → Add Layer, then right-click the layer → Export → Save Features As… and pick GeoJSON as the format.
The MapGO converter above is for when you don't want to install anything, need to convert to several formats at once, or are handling files too large for a desktop machine.
ogr2ogr -f "GeoJSON" output.geojson input.gmlGML to GeoJSON: frequently asked questions
Is the GML to GeoJSON converter free?
Partly. Every new account gets three welcome conversions for free, so you can try GML to GeoJSON without paying. After that, you can either buy a credit pack and pay per conversion, or take a subscription, which gives you unlimited conversions within the plan's file-size limit. There is nothing to install; the whole conversion runs in the cloud.
Is my data kept private?
Conversion is fully automated and your file is never shared. Files are deleted automatically after 48 hours. Download your GeoJSON result and it's yours to keep.
What does the GeoJSON output contain?
You get a clean GeoJSON file with your geometry and attributes preserved, ready to open in the tools that read GeoJSON.
Which coordinate system will the GeoJSON output use?
By default the output keeps your source coordinate system; pick EPSG:4326 (WGS84) as the target if you want spec-standard GeoJSON that works immediately in Leaflet, Mapbox and other web libraries. MapGO reprojects during the conversion — no separate step needed.
Can I convert GeoJSON back to GML?
Yes — use our GeoJSON to GML converter for the reverse direction. MapGO supports conversions in both directions between these formats.
Also convert
See it on the map first.
Open your GML in the workspace, check the shapes and attributes, then convert and download from the same place.