This video shows you how to use the free software Calibre to create an EPUB ebook without any obligation or assistance from the major ebook retailers. Kepubify is usually at least 15x faster and uses 3x less memory than the Calibre plugin; Kepubify produces output nearly identical to official KEPUB files (as of 2020-01-14, Kepubify has a few things which the Calibre plugin doesn't) Kepubify works from the command line; Kepubify gives you complete control over the resulting file structure.

For the following examples, replace kepubify with the path to the downloaded kepubify.

Charter.net mac mail setting for email. To convert a single book by dragging and dropping on Windows:
Just drag the original epub file over kepubify.exe. The resulting file will be saved to the same directory as the original epub.

To convert a folder of books by dragging and dropping on Windows:
Just drag the folder over kepubify.exe. The resulting file will be saved to the same directory as the originals, but with the suffix _converted.

To convert a single book:
kepubify /path/to/the/book.epub
The resulting file will be saved to the current directory.

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To convert a single book with a different output folder:
kepubify --output '/path/to/save/the/book/' /path/to/the/book.epub
The resulting file will be saved to specified folder (in this example /path/to/save/the/book/).

To convert all books in the current folder into a folder called converted:
kepubify -o 'converted' *.epub

To batch convert a directory of ebooks:
kepubify /path/to/the/books/
The converted books will be saved to the original dir with the suffix _converted (e.g. /path/to/the/books_converted).The directory structure of the source is preserved in the output.

To batch convert a directory of ebooks with a different output folder:
kepubify -o '/path/to/output/the/converted/books' /path/to/the/books/
The directory structure of the source is preserved in the output.

To convert a directory of ebooks, but skipping ones which have already been converted:
kepubify --update /path/to/the/books/

Calibre Epub Editor

To convert a calibre library in-place:
kepubify --update --inplace --calibre /path/to/calibre/library/

To convert a folder of books directly on to a Kobo eReader, while simply copying PDF files:
kepubify --output /path/to/kobo/kepubify --update --copy .pdf /path/to/books/ Grundig serial number code calculator v1.2.