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or TextEdit (for limited editing):
Even if your source file is .mobi, after editing it, convert the final product to ePub . Amazon’s new ecosystem prefers ePub files for transfer, which the Kindle device then converts automatically.
Editing .mobi files directly is not straightforward, but converting them to editable formats like EPUB is a viable solution. Utilizing software like Calibre for conversion and then editing with dedicated eBook editing tools is a common approach.
Mobipocket Creator (Free).