How to open a .GRB file online
From file to map in seconds.
Open your .GRB file
Drag it onto the box or click to choose it from your device. It opens on your computer.
See it on the map
Points, lines and areas from your .GRB file appear on an interactive map. Click any feature to read its details.
Read the stats
Check distance, elevation gain and loss, the bounding box and a height profile linked to the map.
What is a .GRB file?
The common language of GPS devices.
A GRB file contains GRIB meteorological data, a binary format the World Meteorological Organization defined for distributing weather model output (temperature, wind, precipitation on a global grid). To open one, use XyGrib or Panoply for a visual map, or wgrib2 and eccodes on the command line. Python users can read it with cfgrib or pygrib.
Programs that open .GRB files
| Full name | GRIB (GRIdded Binary / General Regularly-distributed Information in Binary form) |
|---|---|
| Developer | World Meteorological Organization (WMO) |
| First released | 1985 (GRIB Ed.0); GRIB1 1990; GRIB2 2001 |
| Category | Maps & GIS |
| MIME type | application/x-grib |
| Signature | 47 52 49 42 ("GRIB" - ASCII text at offset 0; file also terminates with "7777" (0x37373737)) |
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Is my .GRB file uploaded anywhere?
No. Your .GRB file is read by your browser and never sent to us. Only the background map tiles are loaded from OpenStreetMap, which sees which map area you're looking at, not your data.
How is the elevation gain calculated?
We add up every climb between track points, ignoring tiny wiggles of less than 3 metres that come from GPS noise. That's close to what Strava and Garmin report; barometric devices may differ slightly.
How do I open a Shapefile?
A Shapefile is several files. Drop the whole .zip, or select the .shp, .dbf and .prj files together. With only the .shp you'll see the shapes but no attributes.
Can I convert GPX to KML or GeoJSON?
Use Export GeoJSON to save everything you see. GPX ↔ KML conversion is part of our upcoming converter.
My CSV has coordinates. Will it work?
Yes, if it has columns named like lat/latitude/y and lon/lng/longitude/x. Every row becomes a point with the other columns as properties.
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