Turn KML placemarks, paths and polygons into a fast, streamable FlatGeobuf file. Free, private and processed right in your browser.
Three steps, no software to install. Works on Windows, macOS, Linux and mobile.
01
Drop a .kml file into the converter, or click to browse. Files up to 100 MB are supported.
02
Click Convert to FlatGeobuf. The file is processed locally, so your data is never uploaded to a server.
03
The FlatGeobuf file downloads straight to your device. Need another format? Pick a converter below.
Converted your KML file? Upload it to GISCARTA and turn it into an interactive map your team or clients can actually use.
Colour by attribute, cluster thousands of points, switch on 3D.
Charts and key numbers next to the map, updated as you filter.
Animate dated features and compare how places change.
Publish a read-only map, embed it on your site, or keep it private with role-based access.
No credit card. No GIS degree. Upload your data and start mapping in minutes.
KML is built for viewing and sharing in Google Earth. FlatGeobuf is built for large datasets and cloud-native web maps.
KML
KML (Keyhole Markup Language) is an XML format created for Google Earth and adopted as an OGC standard in 2008. It stores placemarks, paths and polygons together with their styles and descriptions.
KML is the easiest way to show geographic data to people who don't use GIS software, but it is built for display rather than analysis.
FlatGeobuf
FlatGeobuf is an open, binary vector format built on FlatBuffers. It stores features with a built-in spatial index, so software can read just the area it needs.
It is one of the fastest formats to read and write, and it can be streamed over HTTP from cloud storage without a map server.
Your KML file
KML styles (icons, colours) describe how features look; attributes kept in descriptions or extended data may need tidying after conversion.
The FlatGeobuf output
The output includes a spatial index, so it is ready for fast bounding-box reads and streaming.
Your file never leaves your device: conversion runs in your browser, for files up to 100 MB.
Open large KML datasets in seconds instead of minutes.
Host the file on S3 or any static storage and read only the visible map area over HTTP.
Serve KML features to OpenLayers or Leaflet without running a map server.
Every converter runs in your browser and keeps your files on your device.
