Free online GDB.ZIP to KML converter

People convert GDB.ZIP files when they need to open Garmin waypoints, routes, or tracks in Google Earth or another application that accepts KML. KML also provides a convenient shareable format for map data that originated in Garmin MapSource or compatible software.

What the GDB.ZIP format is

GDB commonly means a Garmin MapSource database file, containing waypoints, routes, and tracks. Garmin MapSource and some Garmin-compatible planning applications create .gdb files. A .gdb.zip file is normally a ZIP archive containing that database; the archive is used to reduce size or package the file for transfer.

The extension can also refer to an Esri file geodatabase. An Esri geodatabase is usually a directory named with the .gdb extension and contains multiple related files, so identify the archive contents before choosing a converter. The Garmin and Esri formats require different software.

What the KML format is

KML is an XML-based geographic format supported by Google Earth, Google Earth Pro, QGIS, ArcGIS, and many web-mapping systems. It can store points, lines, polygons, names, descriptions, folders, and some display styles.

KML is suitable for viewing Garmin waypoints, routes, and tracks on satellite imagery or sharing them with users who do not have Garmin software. It is less suitable than GPX or a native GIS format for preserving every device-specific setting, custom attribute, or navigation instruction.

How to actually convert GDB.ZIP to KML

For a Garmin MapSource database

1. Make a backup of the original .gdb.zip file.
2. Extract the archive with the operating system's archive utility or 7-Zip. The result should be a Garmin .gdb file, not another archive.
3. Install GPSBabel, which supports Garmin MapSource GDB input and KML output.
4. Convert the extracted file from a terminal with:
   gpsbabel -w -r -t -i gdb -f input.gdb -o kml -F output.kml
   Use only the relevant flags if the database contains just waypoints (-w), routes (-r), or tracks (-t).
5. Open output.kml in Google Earth or QGIS and check the locations, route lines, track paths, and names.

On 101convert.com, you can also select the GDB.ZIP input and KML as the output format, then download the converted file without installing software. If the service does not recognize the archive, extract the .gdb file first and submit that file if supported.

For an Esri file geodatabase

If extraction produces a directory ending in .gdb containing files such as a00000001.gdbtable, it is an Esri file geodatabase rather than a Garmin database. Use QGIS: open Layer → Add Layer → Add Vector Layer, select the extracted geodatabase, choose the required layer, then use Layer → Import/Export → Export Features As, select Keyhole Markup Language (KML), choose an output filename, and export.

Quality and compatibility considerations

GPSBabel may not preserve Garmin-specific route settings, turn instructions, proximity alerts, device categories, or all custom fields. KML normally preserves the geographic features and basic names, but not the complete Garmin navigation model.

Check the coordinate reference system when exporting from an Esri geodatabase. KML uses WGS 84 geographic coordinates, so reproject the layer to EPSG:4326 if QGIS does not perform the transformation automatically.

Large track logs can produce very large KML files, especially when every recorded point is retained. Simplify or reduce track-point density only after confirming that the resulting path remains accurate enough for the intended use.