Calibre (Free & Open Source).
There are online tools that can help you convert .mobi to editable formats: edit .mobi
A: .mobi files use older HTML coding standards. If you edit them heavily and convert them back, formatting can break. It is better to convert to ePub first, clean up the formatting, and then convert to your desired final format. Calibre (Free & Open Source)
Arthur felt a chill. "She didn't write that first ending, did she?" It is better to convert to ePub first,
The .mobi shuddered. The text glitched into gibberish for three seconds. Then it reflowed. Arthur scrolled to the final paragraph.
Arthur Pendelton was a dying breed: a professional ebook formatter. In a world of automated converters and AI-driven typesetters, he still manually cleaned the guts of .mobi files. He liked the raw code, the hidden architecture of a story.
Keep in mind that some .mobi files might be DRM-protected (Digital Rights Management), which can prevent editing.