How to convert Shapefile, GeoJSON, KML, GPX and more in your browser (ogr2ogr online, no upload)

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GIS data is often confidential - survey plots, land boundaries, client sites - which makes “upload your file to convert it” services a bad idea. This converter is GDAL’s ogr2ogr compiled to WebAssembly: the conversion runs 100% inside your browser and your files are never uploaded.

Steps

1. Open https://www.clearevo.com/geo/ (first use downloads the ~21 MB engine, cached after).
2. Choose input file(s) - the common vector formats ogr2ogr reads: GeoJSON, GPX, KML/KMZ (KMZ is unzipped in the page first), GeoPackage, DXF, CSV, MapInfo, FlatGeobuf, GML… For a Shapefile, select the .shp, .dbf, .shx and .prj together (the tool warns you if a sibling is missing).
3. Pick the output format: GeoJSON, GPX, KML, GeoPackage, CSV, SQLite/Spatialite, DXF or FlatGeobuf.
4. Optional: type a target CRS (e.g. EPSG:4326) to reproject; leave empty to keep the source CRS.
5. Convert & download - the converted file downloads straight from your browser’s memory.

Honest limits: inputs are capped at 300 MB (WebAssembly memory); multi-file outputs like Shapefile aren’t offered yet (single-file formats only). Errors from GDAL are shown in the log rather than crashing the tab - GPX output in particular requires GPX-compatible layers, so if it complains, convert to GeoJSON first and inspect.

Everything is client-side (Google Analytics for visit stats only - verify).

This tool is free software and open source: ykasidit/web_fun - issues and pull requests welcome.

Full disclosure: this post - and any code or tool it describes - was co-authored with Claude (Anthropic’s AI, via Claude Code). I directed, guided and reviewed - though I have not personally tested every tool in every case; Claude wrote most of the code and most of the text. I don’t want to pretend otherwise.