H3 Converter
Convert between coordinates and Uber H3 hexagonal grid cells.
How to use
- Coordinates → H3: enter a point and resolution (0–15) to get its H3 cell.
- H3 → Coordinates: paste an H3 cell to see its center, boundary, parent, and children.
- Batch (CSV) tab converts many coordinates to H3 cells at once.
Map Preview
Bidirectional H3 Conversion
Encode WGS84 coordinates as H3 cells or decode an H3 cell to its center and polygon boundary. Inspect resolution, area, parent, child, and neighboring cells.
Picking a resolution to match the task — roughly 7–9 for city-scale analysis, 4–6 for regional — keeps cell count and precision balanced. Every encode/decode result is checked against H3's own documented example values, which catches systematic errors that a simple round-trip test alone would miss.
How to use it
- Enter coordinates to encode, or an H3 cell index to decode.
- Choose a resolution from 0 to 15.
- Check the cell boundary, center, and its parent/child/neighboring cells on the map.
Frequently asked questions
What H3 resolution should I pick?
Resolutions run 0 (continent-scale) to 15 (sub-meter); city-scale analysis commonly starts around 7–9.
How was accuracy verified?
Against H3's own documented example values, not just an internal round-trip test.