Quote:
Originally Posted by DNSB
For me, the main difference is that the calibre conversion messes with the css files and calibre can split a single xhtml file into multiple files where some nudnick has used multiple header tags in a single file. When the input file to Amazon was an ePub, KindleUnpack is a lot closer to the original structure.
If you are not planning on actually mucking with the ePub in an editor (Sigil, calibre ebook-editor, whatever), there is not much real difference. If you are planning on editing the ePub, KindleUnpack is the way to go.
I won't get into the philosophical differences I have with Kovid Goyal over attempting to create output files that are compliant to the ePub specs. There is quite a bit of cruft in the ePub specs but many publishers will insist that your ePub pass epubcheck before it will be accepted for publishing.
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There are cases where it's better to do a calibre conversion. I've seen a number of Kindle eBooks where the entire book is one file. I've also seen cases where the eBook has no CSS and this was KF8. Basically, if the KindleUnpacked ePub is too much of a mess, it's better to convert then the shift.