what3words location tools

Polygon & Location Testing Suite

Three powerful tools for working with what3words addresses: polygon creation with auto-resolving points, boundary testing with visual feedback, and simple location lookups.

🗺️ Polygon Creator

Draw polygons and capture GPS points with automatic what3words resolution. Export boundary data with all coordinates converted to three-word addresses.

Processing Mode

Central: Server processes grid generation with timeout protection and auto-resume.
Edge: Your browser does all processing—no rate limits, no timeouts.

🎨 Polygon Test Area

Visual boundary detection: get colored feedback when inside a polygon, white screen when outside. Perfect for geofencing demos and location-based experiences.

Color Boundary Tester

Full-screen experience that changes colors based on your location relative to defined polygons. Also available at colorez.si.eu

📍 Location Tester

Quick what3words lookups: convert GPS coordinates to three-word addresses or verify existing addresses.

Request device location

Get your current GPS position and its what3words address.

Check a what3words address

Format: word.word.word. Returns coordinates.

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