Plot coordinates on an open map

Drop pins from a place search, typed lat/long (decimal or DMS), map clicks, or a bulk CSV — then measure straight-line distance, download CSV, or share a compressed link. Tiles are OpenStreetMap; no paid map key required.

Lat/Long Map Plotter is for checking coordinates, visualizing a small dataset, or comparing points without a paid map account. Add a point by searching, typing decimal or DMS coordinates, clicking the map, or importing a CSV; then inspect markers, measure between two, and export or share the configuration. Manual plotting and distance math stay in the browser. Search and reverse geocoding use OpenStreetMap services, which can be unavailable or rate-limited. Do not place private addresses in a share URL.

How to use the lat/long map plotter

1. Single point: search an address (Nominatim), type decimal/DMS coordinates, or click the map to drop a pin.
2. Bulk: paste or upload a CSV/TSV with lat/lng columns (auto-detected headers) or one lat,lng per line, then Plot all.
3. Click a marker for address (when reverse-geocoded), decimal + DMS values, and Copy coordinates.
4. Pick two markers in Options to see haversine distance in miles or kilometers.
5. Download CSV or Copy shareable link (lz-string URL hash) so others see the same pins with no server storage.

Examples

• Spreadsheet review: Paste latitude and longitude columns to inspect a set of field locations.
• Coordinate check: Enter DMS coordinates and compare the plotted marker with a known point.

Limitations

• Map tiles and geocoding depend on third-party services; straight-line distance is not driving distance.

FAQ

Does every action leave my browser?

No. Manual coordinates, CSV plotting, distance math, CSV export, and share-link encoding are client-side. Only place search and optional reverse-geocoding call Nominatim (OpenStreetMap).

What CSV format works?

Headers like latitude/longitude or lat/lng/lon (comma or tab). Or headerless rows of lat,lng. Optional name/label column becomes the marker label.

Is distance driving distance?

No — it is straight-line (great-circle / haversine) distance between two plotted markers.

Are my coordinates stored on a server?

No. We do not store coordinates server-side. LocalStorage keeps your last marker set on this device; share links put data only in the URL hash.

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