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Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by amluto on Saturday February 06, 2021 @03:26PM (#26049629)
Calibre is great, but IMO it’s the wrong approach for this particular conversion. Use KindleUnpack instead, which is close to lossless.

https://github.com/kevinhendricks/KindleUnpack

This is a fantastic way to read books published by Tor on multiple devices. Now if only Tor would sell the ePub files on their website. (Tor eBooks are not DRMed.)

Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by toyg on Saturday February 06, 2021 @04:53PM (#26050332)
KindleUnpack doesn't seem to handle DRM though.
Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by amluto on Saturday February 06, 2021 @05:50PM (#26050846)
Neither does Calibre’s converter. To convert an encrypted AZW3 to an unencrypted EPUB, one can presumably decrypt it first and convert it second.
Re:Show HN: Epub.to – ePub to pdf, mobi, Kindle, and an API by philtar on Saturday February 06, 2021 @10:51PM (#26052487)
Calibre has a plugin the allows the converter to work with DRM