GIS Tools for Developers

Working with geographic data? These tools cover the most common GIS tasks without needing QGIS, PostGIS or a Google Maps API key.

Coordinate Converter

The Coordinate Converter converts between Decimal Degrees (40.7128°), Degrees Minutes Seconds (40° 42' 46" N) and Degrees Decimal Minutes (40° 42.767' N). Enter in any format and all others update instantly. Includes one-click links to Google Maps and OpenStreetMap.

Distance Calculator

The Distance Calculator computes the great-circle distance between two geographic points using the Haversine formula. Returns results in kilometers, miles, nautical miles and meters. Also calculates the initial compass bearing from point A to point B.

GeoJSON Viewer

The GeoJSON Viewer renders any GeoJSON FeatureCollection on an interactive Leaflet map. Click any feature to inspect its properties. Supports Points, Lines and Polygons.

GeoJSON Validator

The GeoJSON Validator checks your GeoJSON against RFC 7946. It detects invalid geometry types, coordinate values out of range, missing required fields, unclosed polygon rings and more. Shows errors with the exact path to each issue.