I understand the frustration of dealing with formatting issues when switching from epub to pdf. One common problem is text overflow or awkward line breaks, which often happens because pdfs have fixed page sizes while epubs are fluid. To fix this, I recommend using Calibre, a free tool that offers extensive customization. In the conversion settings, adjust the output profile to match your device or intended use. For example, selecting "Tablet" or "Generic e-ink" can help maintain readable font sizes and margins. Also, tweaking the font size and line spacing under "Look & Feel" can prevent text from cramming or stretching unnaturally.

Another issue is images or tables getting cut off or misplaced. In Calibre, enabling the "Heuristic Processing" option under "Page Setup" often resolves this by intelligently reformatting complex elements. If the pdf still looks off, try converting the epub to mobi first, then to pdf, as mobi files sometimes handle layout better as an intermediate step. For advanced users, Sigil is a great epub editor to manually clean up the source html before conversion, ensuring headings, paragraphs, and images are properly tagged. Patience and iterative tweaking are key—small adjustments like margin sizes or disabling publisher styles can make a huge difference in the final output.

Lastly, if the pdf lacks chapter bookmarks, use Calibre’s "Structure Detection" settings to identify headings based on tags like

or

. This automates bookmark creation, making navigation easier. For epubs with heavy styling, like poetry or manga, consider tools like Kindle Comic Converter or dedicated pdf editors like PDFelement to preserve artistic layouts. Always preview the pdf before finalizing, as some issues only appear in specific readers. Remember, no tool is perfect, but combining these methods usually yields a polished result.