Xteink EPUB Optimizer

Quickly optimize EPUBs tailored to your device. Allows options for converting all images to Baseline JPEG, Downscaling to device width, Removing embedded fonts, Grayscale cover adjustments, common EPUB fixes, single or batch mode, and find all Text/HTML removal.

Works fully offline once cached, keeps your setting preferences saved so you don't have to redo each time, and allows for exporting and importing settings for use on another machine.