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Why a Healthy-Looking EPUB Can Still Fail Amazon's Send to Kindle

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An EPUB file may open flawlessly in apps like Apple Books or Calibre yet fail or lose its cover when processed by Amazon's Send to Kindle service. This happens because reading apps often silently fix small errors, while conversion pipelines apply stricter validation to the file's internal package structure. Common culprits include a misplaced or compressed mimetype file, a broken container.xml path pointing to the wrong package document, and a cover image that exists in the archive but is not properly declared in the OPF manifest. Spine or manifest mismatches — where referenced files are missing or IDs don't align — can also cause converters to reject a book that readers would otherwise handle gracefully. These findings emerged from repeated diagnostic patterns observed while building FixMyEPUB, a browser-based EPUB repair tool.

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