Many of you have recently received emails from Kindle Direct Publishing (KDP) announcing that Amazon is changing file requirements for KDP ebooks. As often happens with change, there is some confusion about how this will change how authors and publishers will upload their ebooks to KDP leading to questions and concerns.
“After June 28, 2021, we will no longer support MOBI files when publishing new or updating previously published reflowable ebooks. Instead, use EPUB, DOCX or KPF formats, see our Frequently Asked Questions for more information. MOBI files are still accepted for fixed-layout ebooks.”