Mapshaper

Browser and command-line editor for Shapefile, GeoJSON, TopoJSON and CSV map data

Webfree

Mapshaper is a tool for editing map data in Shapefile, GeoJSON, TopoJSON and CSV formats. It handles tasks such as simplifying geometry, clipping, dissolving, filtering and editing attributes, and is available both as a browser interface that processes files locally and as command line programs for larger datasets.

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