Online Tool Store
Random Coordinate Generator
Generate random latitude/longitude points within a region, with area-correct sampling to avoid over-clustering near the poles.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How the Random Coordinate Generator works
- Set a latitude range and longitude range to define the region.
- Choose how many points to generate and pick a distribution mode.
- Generate the points, then copy them all at once.
Why the distribution mode matters
Lines of longitude converge at the poles, so a 1-degree-by-1-degree cell near the equator covers far more real ground than the same cell near a pole. Sampling latitude uniformly in degrees therefore packs points together at high latitude. Area-correct sampling instead weights latitude by its sine, the standard technique for uniform sampling on a sphere:
sin(lat) = sin(latMin) + random() × (sin(latMax) − sin(latMin)) lat = arcsin(sin(lat))
Longitude is always sampled uniformly between the two bounds, since it doesn't have this distortion.
FAQ
Why do degrees over-sample the poles?
Because a degree of longitude spans far less ground at high latitude than at the equator. Uniform sampling in degrees therefore packs points together near the poles, even though the underlying area is smaller there.
What does "uniform by area" actually fix?
It weights the latitude draw by sine so that a wide band near the equator and a narrow band near a pole get points in proportion to their real surface area, not their degree span.
What is this used for?
Sampling for field surveys, generating test data with realistic geography, spreading synthetic load across regions, and games that place objectives at random.
Is my data uploaded anywhere?
No — every point is generated locally in your browser with JavaScript's random number generator.
How we compare
| Feature | Online Tool Store | Naive lat/lng random() | GIS software |
|---|---|---|---|
| Area-correct sampling option | ✓ | ✗ | ✓ |
| No install | ✓ | ✓ | ✗ |
| Bulk generation with one click | ✓ | Manual scripting | ✓ |
For test data or a quick sample of points across a region, this beats writing the sine-weighted sampling formula yourself.