The average size of my uploaded images to goolepages is 150kb.

Could I make the same size images smaller in file size w/o too much
loss in quality?

Is there freeware that would do this?  ("batch" process to a bunch of
images)

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I don't know of any freeware, I use photoshop.  I'm sure there's
something out there though.

Three things though:
Aim for 50 - 60k per image for size.
72 dpi is all you need for screen.
And reduce the bit depth, you don't need a million colors

Gary