Free GIS & Remote Sensing Tools

A growing suite of fast, free, browser-based utilities for surveyors, drone operators, GIS analysts and developers. Nothing is uploaded; everything runs locally.

Coordinate Converter

DD ↔ DMS ↔ UTM ↔ MGRS. Convert between coordinate systems instantly.

Format Converter

GeoJSON ↔ KML ↔ GPX ↔ CSV. Convert geo files in your browser.

Measure on Map

Measure distance, area and perimeter by drawing on a map.

GeoJSON Viewer

Paste, view and validate GeoJSON on an interactive map.

EPSG / CRS Lookup

Search coordinate reference systems and reproject coordinates.

Bounding Box Tool

Draw or enter a bbox; get it in comma, GeoJSON, WKT and Overpass formats.

Tile & Quadkey Calculator

Convert lat/lon/zoom to XYZ tiles and Bing quadkeys, and back.

GSD Calculator

Drone ground sample distance (cm/px) and footprint from sensor specs.

Geodesic Calculator

Distance, bearing, midpoint and destination on the WGS84 globe.

WKT Converter

Convert Well-Known Text to GeoJSON and back, both directions.

Geohash Converter

Encode lat/lon to a geohash, or decode one to coordinates and bounds.

Polyline Decoder

Decode Google encoded polylines to coordinates and GeoJSON, or encode.

Guides for GIS and remote sensing

New to coordinate systems, file formats or drone mapping? Our plain-English guides explain the concepts behind the tools so you can use them with confidence:

Why geocoordinate.site?

Every tool here runs entirely in your browser. Your coordinates, files and GeoJSON are processed on your own device and are never uploaded to a server, so the tools are safe to use with sensitive survey and project data. There is no sign-up, no install, and no cost. Calculations use well-established open-source libraries (proj4, turf and mgrs) on the WGS84 ellipsoid, so results match professional GIS software.