18 free tools · runs entirely in your browser

Spatial tools for developers.

Convert coordinates, geocode addresses, inspect GeoJSON, calculate geometry, and work with spatial data — no install, no sign-up.

Try Coordinate Converter Browse all tools

InstantClient-side compute

PrivateData stays on-device

FreeNo account required

Coordinates & CRS

Coordinates

Transform coordinates between EPSG coordinate reference systems.

Geocoding

Convert addresses to coordinates and coordinates to addresses.

Convert & Inspect

GeoJSON ↔ WKT

Convert spatial data between GeoJSON and WKT formats.

Geometry Inspector

Inspect geometry type, bounding box, centroid, and validity.

Polyline

Convert between Google's encoded polyline format and GeoJSON/WKT.

Measure & Analyze

Distance

Calculate geodesic distance between two points.

Area

Measure the area and perimeter of a polygon.

Buffer

Create a spatial buffer around a geometry.

Bounding Box

Generate the bounding box of a geometry.

Spatial Ops

Test spatial relations and combine polygons with union, intersection, or difference.

Grid & Index

H3

Convert between coordinates and Uber H3 hexagonal grid cells.

Geohash

Convert between coordinates and geohash strings.

Tiles

Convert between coordinates and XYZ/TMS/quadkey slippy-map tiles.

Files & Data

Files

Convert GPX, KML, or CSV files to and from GeoJSON.

Optimize

Shrink a geometry's GeoJSON footprint via simplify + coordinate precision truncation.

Generate

Generate random Point or Polygon GeoJSON features within a bounding box.

Reference

EPSG Finder

Find and inspect coordinate reference systems, including Korean CRS.

PNU Decoder

Decode a 19-digit Korean cadastral PNU into 법정동코드, 산/일반 구분, and 지번.

Your spatial data stays in your browser whenever possible. Address searches on the Geocoding tool are sent to the configured geocoding provider.