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Originally Posted by BetterRed

It sounds like you are doing the 'shrinking' and 'converting' in the calibre library manager.

Most things can be done directly via commands, see ==>> calibre User Manual: The Command Line Interface.


BR

My thanks. I did use the Calibre library manager. It worked well and reduced my library size by about 25%. Would have been a lot more but most of the books had already had their covers compressed.

The Command line interace does look a more elegant solution and I hope somebody has published the necessary instructions. Offhand I don't think most of us would find it easy without. I certainly ain't motivated given I already have something workable.