Convert KML to TopoJSON

Simple solution for complex geospatial data transformations.

Start your conversion

Your files will be securely handled and automatically deleted.

Why MyGeodata Converter?

  • Convenient for both occasional and regular use
  • Clean TopoJSON for QGIS, D3.js, OpenLayers or Highcharts
  • Supports many formats (vector + raster), useful in mixed GIS/CAD workflows
  • Batch uploads (ZIP and 7z supported)
  • 7,000+ coordinate systems
  • API available

Supported coordinate systems

  • WGS 84
  • WGS 84 / Pseudo-Mercator
  • WGS 84 / UTM zone [1-60] [N/S]
  • ETRS89
  • ETRS89 / LAEA Europe
  • ETRS89 / TM35FIN(E,N)
  • ETRS89 / Portugal TM06
  • ETRS89 / UTM zone [28-37] N (N-E)
  • NAD83
  • NAD83 / Pennsylvania South (ftUS)
  • NAD83(NSRS2007) / Texas South Central (ftUS)
  • NAD27
  • NAD27 / California zone VII
  • GDA94
  • GDA94 / MGA zone 41-59
  • GDA2020 / MGA zone 46-59
  • NZGD2000 / New Zealand Transverse Mercator 2000
  • Amersfoort / RD New
  • OSGB36 / British National Grid
  • Merchich / Nord Maroc
  • S-JTSK / Krovak East North
  • Israel 1993 / Israeli TM Grid
  • GGRS87 / Greek Grid
  • BD72 / Belgian Lambert 72
  • Dealul Piscului 1970/ Stereo 70
  • SIRGAS 2000
  • SIRGAS 2000 / UTM zone 23S
  • MAGNA-SIRGAS / Colombia Bogota zone
  • RGF93 / Lambert-93
  • ETRF2000-PL / CS92
  • HD72 / EOV
  • HTRS96 / Croatia TM
  • SWEREF99 TM
  • Merchich / Sud Maroc
  • SAD69 / UTM zone 23S
  • SAD69 / UTM zone 22S
  • Monte Mario / Italy zone 1
  • DHDN / 3-degree Gauss-Kruger zone 3
  • MGI / Austria Lambert
  • Pulkovo 1942 / Gauss-Kruger

...and 7,000+ other coordinate reference systems

Conversion from KML to TopoJSON

Upload your Keyhole Markup Language (KML) data files (typically used in software like Google Earth, Google Maps, Locus Map or other software for outdoor activities) and convert them online in a few clicks to TopoJSON format (most commonly used in software such as QGIS, D3.js, OpenLayers or Highcharts) or to many other formats commonly used in GIS and CAD systems.

How it works

  • 1

    Data upload

    Upload one or more Keyhole Markup Language (KML) files (or a .ZIP / .7z archive).

  • 2

    Review and display

    Reviewing input data parameters and displaying their extent on a map.

  • 3

    Conversion options

    Settings for format options and conversion parameters.

  • 4

    Download result

    Resulting TopoJSON files are packaged in ZIP format and ready for immediate download by the user.

Technical details

Input data
Format Keyhole Markup Language
Description OGC-standard XML for geographic visualization (folders, styles, overlays). <MultiGeometry> maps to GEOMETRYCOLLECTION in GDAL/OGR.
File type vector / single-file
Extensions .kml
Note XML text; may reference external images/models/icons.
Supported geometries POINT LINESTRING POLYGON GEOMETRYCOLLECTION
Reference  https://www.ogc.org/standards/kml/
Download sample KML


Output data
Format TopoJSON (topological GeoJSON)
Description Topology-aware variant of GeoJSON that references shared arcs. Great for political/admin boundaries with common edges.
File type vector / single-file
Extensions .topojson / .json
Note JSON with shared arc topology; reduces duplication in boundaries.
Supported geometries POINT MULTIPOINT LINESTRING MULTILINESTRING POLYGON MULTIPOLYGON GEOMETRYCOLLECTION
Reference  https://github.com/topojson/topojson-specification
Download sample TopoJSON

Frequently Asked Questions

What is KML file?

The KML (Keyhole Markup Language) format is an XML-based file format developed by Keyhole Inc. (later acquired by Google) for storing and visualizing geospatial data. It is primarily used to represent geographic features such as points, lines, polygons, images, and overlays, often together with descriptive information like names, icons, or metadata. KML files are widely used for displaying data in Google Earth, Google Maps, and other GIS (Geographic Information System) applications that support the format. Because KML is human-readable and based on standard XML, it is easy to create, edit, and share for visualization and geographic analysis.

What is the maximum allowed size of input data?

The maximum size of the uploaded file is 5 GB. If your file is larger, you can try to compress it into a ZIP file with the maximum compression level (9) or, even better, into a 7z file. The contents of the package will be automatically unpacked on the server.

How secure is my data?

All data transfers are performed using the encrypted SSL protocol, which ensures secure data transfer. Both uploaded and converted data is temporarily stored in the data center and is further processed according to the user’s request. After some time, the data is automatically deleted - there is no need to delete it manually.