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GIS & Formats
Tools for GeoJSON, KML, GPX, map projections and other geospatial data formats.
Tools (4)
GeoJSON Viewer — Preview & Validate GeoJSON
Paste or upload GeoJSON to preview it on an interactive map and validate its structure. Runs 100% in your browser — your data never leaves your device.
KML Converter — KML to GeoJSON
Upload a KML file to convert it into downloadable GeoJSON and preview every feature on a map. Fully client-side — no uploads, free, no sign-up needed.
GPX Viewer — Track Stats & Map
Upload a GPX track to see it on an interactive map with total distance, elevation gain and loss, and point count. Runs in your browser — free, no sign-up.
Map Projection Calculator
Project latitude and longitude to x/y metres with spherical Mercator or equirectangular formulas. Set a central meridian and standard parallel, compare both.
Related articles (2)
6 min read
Map Projections Explained: Why Every Map Lies
You cannot flatten a sphere without distortion. Learn what different projections preserve, and how to pick the right one.
7 min read
How Does GPS Work? A Clear Technical Explanation
GPS works by measuring your distance to at least four satellites in orbit, then using trilateration to compute your position.
About GIS & Formats
Tools for GeoJSON, KML, GPX, map projections and other geospatial data formats. These tools cover the most common use cases, from quick lookups to detailed planning.