Table join to KML file

It should be possible with the open-source program QGIS. I recommend installing the LTR (long-term release) version, QGIS 2.18, because the documentation is much better than for the newest version.

1. Save the Excel file in CSV (comma-separated value) format.

2. Load the KML into a QGIS project.

3. (optional, but a good idea) Install the plugin QuickMapServices, and use it to add a basemap to your project. Compare the KML to the basemap and make sure it's in the correct location. If it's not, do not proceed until you resolve the issue. Otherwise your final export will be incorrectly geolocated.

4. Load the CSV file as an attribute-only table in the same QGIS project.

5. Join the table to the KML.

6. Export the joined layer in KML format.

See also:

• QGIS User Guide
• QGIS Training Manual
• A Gentle Introduction to GIS