Your GIS Toolbox, Online
Coordinate conversion, EPSG search, GeoJSON editing, format conversion — all in one place, no install needed.
What is KunYu?
KunYu is a free, all-in-one online GIS toolbox designed for developers, surveyors, and geospatial professionals. Named after the Kunyu Wanguo Quantu (坤舆万国全图) — the first complete world map in Chinese history, created in 1602 — KunYu carries the spirit of mapping the world into the digital age.
GIS professionals often juggle between multiple websites for different tasks: epsg.io for coordinate reference system lookups, geojson.io for editing, mapshaper for geometry simplification, and scattered scripts for coordinate conversion. KunYu consolidates all these capabilities into a single, fast platform with 18 professional tools covering coordinate conversion, EPSG search, GeoJSON editing, format conversion, spatial analysis, and more.
Every computation runs entirely in your browser using WebAssembly and modern JavaScript libraries like Proj4js, Turf.js, and MapLibre GL JS. Your data never leaves your device — no uploads, no server processing, no account required.
Most Popular Tools
18 tools for coordinate conversion, EPSG search, GeoJSON editing, spatial analysis and more. Free, online, no install.
Coordinate Converter
Convert coordinates between EPSG systems with batch support and smart detection.
EPSG Search
Search and browse the EPSG coordinate reference system database.
GeoJSON Editor
Edit GeoJSON with a code editor and live map preview.
Format Converter
Convert between SHP, KML, GPX, CSV, and GeoJSON.
EPSG Finder
Find applicable EPSG codes by clicking or drawing on the map.
Measure
Measure distances and areas on an interactive map.
Why KunYu?
Browser-Powered
All computations run in your browser via WebAssembly. No file uploads, no server processing — your data never leaves your device.
18 Professional Tools
Coordinate conversion, EPSG search, GeoJSON editing, format conversion, spatial analysis — everything a GIS professional needs.
Open Format Support
Full coverage of SHP, KML, GPX, CSV, GeoJSON, WKT, and WKB. Compatible with QGIS, ArcGIS, Google Earth, and all major GIS software.
Data Privacy First
Your geospatial data stays private. Core tools run entirely in your browser — no account required to get started.
Built for GIS Professionals
Whether you're a developer, surveyor, or data analyst, KunYu has the tools you need.
GIS Developers
Quick coordinate system conversions, EPSG lookups, and GeoJSON validation during development. Copy results directly into your code.
Surveyors & Cartographers
Field coordinate picking, format conversions between DD/DMS/UTM/MGRS, and spatial measurements — all from your mobile browser.
Data Analysts
Transform geospatial data between SHP, KML, GPX, CSV, and GeoJSON. Generate buffers, simplify geometries, and validate data quality.
From the Blog
Guides, tutorials, and insights for GIS professionals.
Convert Coordinates Between EPSG Systems
Learn how to convert coordinates between EPSG coordinate systems using proj4js, pyproj, and ogr2ogr, with practical examples for WGS 84, Web Mercator, UTM, and China CRS.
Read moreh3-js vs ngeohash: Choosing the Right JavaScript Spatial Index Library
Bundle sizes, encoding benchmarks, API comparison, and production gotchas for h3-js and ngeohash — with real measurements.
Read moreH3 vs Geohash vs S2: Choosing the Right Spatial Index
H3, Geohash, and S2 spatial indexes compared: precision tables, latitude distortion, boundary bugs, code examples in JS and Python, and a decision matrix.
Read more