GeoConvert converts geodata files (KML, KMZ, GPX, GeoJSON, CSV, zipped Shapefile) between formats and coordinate systems entirely in your browser. No file is ever uploaded: parsing and conversion run client-side, so zero bytes of file content reach a server. Reprojection covers WGS84, SWEREF99 TM, all 12 SWEREF99 local zones, and RT90 2.5 gon V, systems most general-purpose converters barely support. Free, no signup, no account needed.

I built GeoConvert after running into the same problem repeatedly: reprojecting Swedish geodata between SWEREF99, RT90, and WGS84 without uploading the file to a third-party server. Most converters online either don't support Swedish coordinate systems at all, or they route your file through a backend you don't control, which is a nonstarter when the data is confidential. So I built a converter that does everything in the browser. No upload, no account, no server-side processing of file content. It started as a tool for my own work with municipal and survey data and grew into something that covers most common geodata formats and Swedish coordinate systems. Feedback and format requests welcome. Happy to add more coordinate systems if there's demand.

The fact that everything runs client-side with zero uploads is such a thoughtful build choice, especially for anyone working with sensitive location data. Bonus points for actually including SWEREF99 and RT90 support.

GeoConvert: geodata file converter

Browser-only geodata converter, built for Swedish grids

Browser-only geodata converter, built for Swedish grids