If you want to convert your KML file into Topojson then at the top of the thing is that you have to know that what is KML file and TopoJSON file and how to convert it. Here you can find what is KML and TopoJSON and how to convert KML file with easy steps.
What is the KML ( keyhole markup language ) file?
A KML file stands for a Keyhole Markup Language. A KML file is KML extension. That KML is developed by Google, keyhole, Inc. KML is an XML based extended form. KML is format to sharing geographical data with non GIS users as it can be easily delivered on the internet and that is viewed in a number of free application. A KML file is compressed or zipped files.
What is a TopoJSON file?.
TopoJSON is an extension of GeoJSON that encodes topology. That representing geometries discretely, geometries in TopoJSON files that come together from shared line segments and that is called arcs.
TopoJSON is more compact than GeoJSON, that are frequently offering a reduction of 80% or more even without simplification. Yet encode a topology also has numerous useful application for maps and visualization above. It allows topology preserving shape simplification, which guaranteed that adjacent features remain connected after simplification, this can be applied even across feature collection. Such as simultaneous and consistent simplification of state and company boundaries. Topology also can be used for Dorling and hexagonal cartograms as well as other techniques that need to share boundary information such as automatic map coloring.
Steps to convert KML to TopoJSON
Here you can do is just import your KML file and you show your KML file choose the KML file that you convert it into TopoJSON format. Then choose the TopoJSON format that you convert it. After this step, you have shown your TopoJSON file instant preview. If you have to share your TopoJSON file with your friends then this is also possible just hit share button and share with your friends. And you have done your KML file is convert it into TopoJSON format. Simple and easy to use.
KML viewer and converter 