THE TOOL COLLECTION

Geographic & Coordinate Tools

Convert coordinates, inspect GeoJSON/GPX and measure supplied distances, bearings, routes and polygons privately without map tiles.

9 available tools Processed on your device

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Free. No sign-up required.

Convert, validate, view and measure geographic data in one private workspace.

Convert latitude/longitude between decimal degrees and DMS with sign validation.

Calculate spherical great-circle distance between two coordinates, with a sampled path and explicit model.

Find initial, final forward and reverse true bearings between supplied coordinates, with undefined cases explained.

Validate a bounded structural GeoJSON profile locally, inspect geometry and see explicit warnings.

Explore GeoJSON points, lines and polygons in a private interactive coordinate diagram without external map tiles.

Calculate spherical polygon area and boundary length, with simple-ring and hole checks within one hemisphere.

View local GPX waypoints, routes and separate track segments without uploading files or loading map tiles.

Measure supplied coordinate routes or GeoJSON lines, keeping gaps between segments separate; no live routing.