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Try terrio in your browser. This page runs the npm package, terrio compiled to WebAssembly: files are read and written on your computer and never uploaded. The first visit downloads about 4 MB.

Loading terrio…

Drop a file here or .

GeoTIFF/COG (including LERC, JPEG XL and LZMA), JPEG 2000, GeoPackage, PMTiles, MBTiles, GeoJSON, FlatGeobuf, GeoParquet, CSV, KML/KMZ, GML, GPX, TopoJSON, OSM, or a zip of a shapefile.

Or a sample:

Transform coordinates






The page uses the same functions a web application would; see JavaScript for the
API.