Can be done in QGIS.
Add Google Satellite basemap to QGIS
Add your polygon to QGIS
Zoom the view to the polygon so the map extent is occupied as much as possible with your polygon
Save the google satellite using:Export the Google Satellite layer
Save As Geotiff, clear the box against "Create VRT",
Provide a filename
Click Map Canvas Extent
For Resolution, choose horizontal and vertical, make them the same. Play with the value and keep an eye on the columns to make sure they are not too big. Maybe start with 10. Column values in the 1000 to 2000 should be fine. Depends on your use case.
Click OK
Now to clip that saved tiff file to your polygonOn the top menu bar, click raster then extraction then clip raster by mask layer
input layer = the saved tiff file from above
mask layer = your polygon
then click run, to save to a temporary layer or you can save to a file
You may need to consider Google Earth's conditions of use in regard to using their imagery and how your target audience may react.
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