Run downloaded files through an updated antivirus scanner or upload them to tools like VirusTotal before opening them on your primary e-reader or computer. The Verdict

| Tool | Best for | |------|----------| | (with Index Generator plugin) | Manual creation & fine-tuning | | Adobe InDesign (export to EPUB) | Auto-generates clickable index from page references—but requires cleanup | | Calibre + Modify EPUB plugin | Adding/editing indexes in bulk | | Python script using html.parser + BeautifulSoup | Custom conversion from print index to linked EPUB index |

: Supports screen readers, adjustable fonts, and text-to-speech synchronization (Media Overlays), making it ideal for readers with visual impairments. Rich Multimedia

If you switch from an Android phone to an iPhone, or from a Kobo reader to a desktop computer, your books move with you. You never have to re-purchase a book just because you changed your hardware. 3. Superior Visual Customization