GeoJSON Developer Tools
Twelve tools, seven converters and sixteen guides. Everything runs in your browser tab and nothing is uploaded.
Start here
Tools
Inspect
Measure
GeoJSON Bounding Box Calculator
Calculate the bounding box envelope of any GeoJSON geometry. Get min/max coordinates instantly.
GeoJSON Area Calculator
Calculate the area of GeoJSON polygons in square meters and square kilometers.
GeoJSON Length Calculator
Calculate the total length of GeoJSON LineStrings in meters and kilometers.
GeoJSON Centroid Calculator
Find the geographic center point of any GeoJSON geometry. Calculate centroids for polygons and feature collections.
Transform
GeoJSON Simplifier
Simplify complex GeoJSON geometries to reduce file size while preserving shape accuracy.
GeoJSON Optimizer
Reduce coordinate precision. Simplify geometry. Drop unused properties. Minify. Every step reports what it saved as it runs.
GeoJSON Merge Tool
Merge multiple GeoJSON files into a single FeatureCollection.
GeoJSON Buffer Tool
Create buffer zones around GeoJSON geometries at a specified distance.
GeoJSON Clip Tool
Clip GeoJSON features to a bounding box or polygon boundary.
GeoJSON Union Tool
Compute the union of multiple GeoJSON polygons into a single geometry.
Converters
Into GeoJSON
KML to GeoJSON Converter
Convert KML files from Google Earth to GeoJSON format for web mapping and GIS applications.
WKT to GeoJSON Converter
Convert Well-Known Text geometries to GeoJSON format for web mapping and visualization.
GPX to GeoJSON Converter
Convert GPX track files to GeoJSON format. Transform GPS data for web mapping.
Lat/Long to GeoJSON Converter
Convert latitude and longitude coordinates to GeoJSON Point features.
Out of GeoJSON
GeoJSON to KML Converter
Convert GeoJSON files to KML format for use in Google Earth and other mapping applications.
GeoJSON to WKT Converter
Convert GeoJSON geometries to Well-Known Text format for use in databases like PostGIS.
GeoJSON to Lat/Long Extractor
Extract latitude and longitude coordinates from GeoJSON features into a table or CSV.
Guides
New to GeoJSON
What is GeoJSON?
Learn about GeoJSON - the open standard format for encoding geographic data structures using JSON.
GeoJSON Examples
Browse common GeoJSON examples for Point LineString Polygon and FeatureCollection types.
GeoJSON Frequently Asked Questions
Answers to the most common GeoJSON questions about coordinate order file size limits and browser support.
The format
GeoJSON Specification (RFC 7946)
A developer-friendly guide to the GeoJSON specification RFC 7946 with examples and explanations.
GeoJSON Best Practices for Developers
Best practices for working with GeoJSON data in web mapping and GIS applications.
Coordinate Reference Systems (CRS)
Understand coordinate reference systems and how they relate to GeoJSON and web mapping.
GeoJSON vs Shapefile vs GeoPackage
Compare GeoJSON Shapefile GeoPackage and other geospatial formats. When to use each and migration strategies.
GeoJSON vs TopoJSON Comparison
Compare GeoJSON and TopoJSON formats. Learn when topology-preserving formats save space.
By language and platform
Working with GeoJSON in Python
Use GeoJSON in Python with json Shapely GeoPandas and Fiona. Read write transform and serve spatial data.
Working with GeoJSON in JavaScript
Parse transform and render GeoJSON in JavaScript with Turf.js Leaflet Mapbox GL and TypeScript types.
Using GeoJSON with PostGIS
Learn how to import export and query GeoJSON data in PostGIS spatial databases.
Web Mapping Developer Guide
A comprehensive guide to building interactive web maps with GeoJSON Leaflet and modern tools.
Working with real files
GeoJSON Debugging Guide
Fix common GeoJSON problems: points in the ocean reversed polygons invalid geometries and coordinate order issues.
GeoJSON File Size Optimization
One public-domain dataset taken from 55 MB down to 4 MB. What each optimisation is actually worth once the file is compressed.
Spatial Operations Explained
Learn buffer clip union intersection and difference operations with real GeoJSON examples you can paste into tools.
Build a Store Locator with GeoJSON
Step-by-step tutorial: geocode addresses create GeoJSON features and build a proximity search map with Leaflet.