Add your files
Drop one EPUB or two hundred. Batch conversion is not a paid feature here.
An ebook has to be printed, annotated in a PDF reader, or read on a device that has no EPUB support at all.
Reflowable text is typeset into fixed pages at a chosen page size and font size. Once that happens the text no longer adapts to the screen, which is the entire trade.
You are choosing the page size on the reader's behalf, permanently. A phone-sized PDF is unusable on a desk and an A4 PDF requires constant zooming on a phone. If the destination is an e-reader rather than a printer, converting to another reflowable format is almost always better.
Table of contents links and footnote links usually survive as PDF link annotations, provided the EPUB used proper internal anchors.
The default font size and margins are being applied to text that was written to reflow. Set them explicitly for the page size you chose.
No. Files from a store with DRM are encrypted and cannot be converted by any tool.
Drop one EPUB or two hundred. Batch conversion is not a paid feature here.
Portable Document Format is lossy, so the quality control decides the trade between size and fidelity.
Converted and deleted the moment it finishes. Never written to permanent storage.