The top 5 MOBI to EPUB converter software tools are Calibre, Epubor Ultimate, CloudConvert, Zamzar, and Convertio. While the older MOBI format is being phased out by Amazon in favor of EPUB, these tools allow you to seamlessly transition your existing digital library to the universal EPUB standard. Comparison of Top 5 MOBI to EPUB Converters Platform Type Calibre Desktop App Complete library management Free & Open Source Epubor Ultimate Desktop App DRM removal & batch conversion Paid (Free Trial) CloudConvert Maintaining layout quality Free (Limits) / Paid Zamzar Quick, no-installation files Free (Limits) / Paid Convertio Cloud-heavy workflows Free (Limits) / Paid Deep Dive into the Top 5 Tools