biggest problem with pdfs on e-readers is that they are usually formatted for a partiuclar "page size" which is at least double the average e-reader screen size. The upshot of this is the text areas are far too wide, which means to fit them left-to-right on the screen, they shrink to an uncomfortable size.
Short answer for .pdf: more pages, narrow or zero side margins, fewer words per line. Imagine printing the PDF to the size of an e-reader screen and you'll be on the right track.
The _best_ answer is to provide a .epub format. then there are no issues.
I... Had no idea... 🫣😅🤣
The epub was just about half the size of the already more compact PDF, though, I exported the pdf with a 10pt font, single spaced. 167 pages of fairly dense text.
12 point double speced balloons up to 460 pages. Ouch.
I'm not in publishing or possessing any special knowledge here - just speaking as an end user.
Since PDFs dont "re-flow" when you pull the margins in, something's gotta give. So it shrinks like a .jpg
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