In article , Scott Lurndal
wrote:

If you want to remove the EXIF data (which also contains the thumbnail),
you can use Exifer:
http://www.friedemann-schmidt.com/software/exifer/

Exifer comes up with a 404 not found in the tucows link at bottom.

your original question was to save a valid thumbnail, not remove it.
that happens automatically when saving the photo.

if you want to remove it, then use exiftool.