Enter a target point with latitude and longitude. Add your polygon vertices below, listing one set of coordinates per line. Our free Geofence Checker verifies whether your point falls inside the defined boundary instantly.
Checked locally in your browser — nothing is sent to our server.
Computed entirely in your browser — nothing you enter here is sent to our server.
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How This Geofencing Tool Works
Our tool performs a standard Geographic Information System (GIS) operation known as a point-in-polygon test. Businesses use geofencing to trigger actions when devices enter a specific area. Delivery services rely on it to confirm whether customer addresses fall within their delivery zones.
The system connects your polygon vertices in sequence to form a closed shape. After building the boundary, the algorithm checks your target point against the exact area. Browser-based calculations run instantly without sending your sensitive location data to external servers.
FAQ
Does the order of the polygon vertices matter?
You must enter vertices in chronological order along the perimeter. Follow either a clockwise or counter-clockwise path. Entering random coordinates creates overlapping lines and produces inaccurate results.
Is my coordinate data uploaded anywhere?
We process all location calculations locally inside your web browser. Your inputs remain private because we never transfer or save coordinate data on our servers.
Can I test multiple points against the same polygon boundary?
You can test several coordinates efficiently. Keep your main polygon vertices unchanged and simply update the target point coordinates before running another check. You can also trace initial IP coordinates using our IP Address Location Tool before running spatial tests.