GeoJSON Developer Tools
Free online tools to view, validate, convert, and transform GeoJSON data. No signup required. Everything runs in your browser.
GeoJason provides 18 purpose-built tools for working with GeoJSON, the open standard format for encoding geographic features defined in RFC 7946. Whether you need to visualize features on a map, convert between formats like KML, WKT, and GPX, run spatial operations like buffering and clipping, or calculate areas, lengths, and centroids — every tool works instantly in your browser with no server uploads and no data stored.
How It Works
Paste or Upload
Drop your GeoJSON, KML, WKT, GPX, or coordinate data into any tool.
View the Results
See output instantly on an interactive map powered by Leaflet, with results you can copy or download.
No Signup, No Server
All processing happens client-side in your browser. Your data never leaves your machine.
GeoJSON Tools
GeoJSON Viewer
View and visualize GeoJSON files on an interactive map. Paste or upload your GeoJSON data to see it rendered instantly.
GeoJSON Validator
Validate your GeoJSON data against the RFC 7946 specification. Find and fix errors in your GeoJSON files.
GeoJSON Simplifier
Simplify complex GeoJSON geometries to reduce file size while preserving shape accuracy.
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.
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.
Format Converters
GeoJSON to KML Converter
Convert GeoJSON files to KML format for use in Google Earth and other mapping applications.
KML to GeoJSON Converter
Convert KML files from Google Earth to GeoJSON format for web mapping and GIS applications.
GeoJSON to WKT Converter
Convert GeoJSON geometries to Well-Known Text format for use in databases like PostGIS.
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.
GeoJSON to Lat/Long Extractor
Extract latitude and longitude coordinates from GeoJSON features into a table or CSV.
Guides & Resources
What is GeoJSON?
Learn about GeoJSON - the open standard format for encoding geographic data structures using JSON.
GeoJSON Specification (RFC 7946)
A developer-friendly guide to the GeoJSON specification RFC 7946 with examples and explanations.
GeoJSON Examples
Browse common GeoJSON examples for Point LineString Polygon and FeatureCollection types.
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 TopoJSON Comparison
Compare GeoJSON and TopoJSON formats. Learn when topology-preserving formats save space.
Web Mapping Developer Guide
A comprehensive guide to building interactive web maps with GeoJSON Leaflet and modern tools.
Using GeoJSON with PostGIS
Learn how to import export and query GeoJSON data in PostGIS spatial databases.
GeoJSON Frequently Asked Questions
Answers to the most common GeoJSON questions — coordinate order file size limits browser support and more.
GeoJSON Debugging Guide
Fix common GeoJSON problems: points in the ocean reversed polygons invalid geometries and coordinate order issues.
GeoJSON File Size Optimization
Reduce GeoJSON file size by 50-90% using simplification precision reduction minification and format alternatives.
Spatial Operations Explained
Learn buffer clip union intersection and difference operations with real GeoJSON examples you can paste into tools.
GeoJSON vs Shapefile vs GeoPackage
Compare GeoJSON Shapefile GeoPackage and other geospatial formats. When to use each and migration strategies.
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.
Build a Store Locator with GeoJSON
Step-by-step tutorial: geocode addresses create GeoJSON features and build a proximity search map with Leaflet.
Popular Guides
Why GeoJason?
100% Client-Side
Every tool runs entirely in your browser using JavaScript and Turf.js. Your GeoJSON data is never uploaded to a server. This means instant results with no bandwidth limits, no queue times, and no file size restrictions beyond your browser's memory.
Developer-Focused
Built by developers who work with GeoJSON daily. Every tool shows both a map preview and raw JSON output. Copy buttons on all code blocks. Results that are ready to paste directly into your code, database, or API response.
RFC 7946 Compliant
All tools follow the GeoJSON specification. The validator checks against RFC 7946, including the right-hand rule for polygon winding order and the longitude-first coordinate convention. WGS 84 (EPSG:4326) is the only supported CRS. No proprietary extensions or format quirks.