I stumbled upon this issue when I wanted to read a PDF on my e-reader, and it was a bit of a hassle at first. The easiest way I found is to use free online converters like Calibre or Zamzar. Calibre is especially good because it’s not just a converter but also a full-fledged e-book manager. You just drag your PDF into Calibre, select 'Convert Books,' and choose EPUB as the output format. The downside is that PDFs with complex layouts might not convert perfectly, but for most novels or text-heavy documents, it works like a charm. I also tried some mobile apps like 'PDF to EPUB Converter,' which are handy for quick conversions on the go. If you’re tech-savvy, you can tweak the conversion settings in Calibre to preserve formatting better, but the default settings usually do the job.