: Unlike PDFs, a "proper" EPUB should allow you to change font sizes and styles without breaking the layout. Reading Experience Reviews

: Apps like BookFusion are highly praised for their customization options.

: Professionals often open EPUBs (which are just "special zip archives") in software like Sigil to check for "code smell"—excessive tags or broken links that can slow down your device.

“EPUBs are less strict about formatting, and can be rendered differently on different devices, but can be less precise about how features like tables and footnotes are formatted.” Reddit · r/DataHoarder · 5 years ago

: The reMarkable tablet's native reader is frequently criticized for its poor handling of hyperlinks and slow reformatting. Community Perspectives

To provide a "proper review," we must look at the quality of the file itself and the reader software used to open it. File Quality Check