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Except it often doesn't work well, and sometimes not at all to convert pdf or djvu. If they are actually having all the pages as images, you can use a utility to convert to the same format, but reducing noise, improving brightness and contrast, reducing bit depth (if mono). Not converting to other formats such as epub.
You might run OCR and then proof PDF/djvu to convert to docx and then when all fixed convert that to epub.
Some PDFs have uncorrected OCR layer.
Some PDFs do have text and vectors, then you can convert/edit them in MS Word, or LO Writer, and then fix, make docx and then epub.
It's too much work. If you have hundreds or more better to get a larger screen device with more storage. I gave up, so have a 10″ tablet with 256G SD card and 10.3″ Elipsa and 8″ Sage (more dots) eink both 32 G Flash.
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