Portable Document Format (PDF) is an open standard for document exchange. In the years before, most of ebook published were in PDF format. However, with the coming of digital ebook reader, the most famous ones are Amazon Kindle, Sony Reader, Apple iPad, the market share of PDF publishing is gradually dropping, because it is can’t not be read well on eReader. On the contrast, EPUB is becoming more poplar among the digital publishing.
The EPUB format is an open eBook format recommended by The International Digital Publishing Forum. It is essentially a ZIP format. If you change its extension “.Epub” to “.zip”, the EPUB file becomes a true ZIP file which can be unzipped.
EPUB is designed for reflowable content, meaning that the text display can be optimized for the particular display device used by the reader of the EPUB-formatted book. The format is meant to function as a single format that publishers and conversion houses can use in-house, as well as for distribution and sale.
EPUB has been widely adopted as the format for digital books (eBooks), all of the leading ebook devices support Epub as its main format. and these new specifications significantly increase the format’s capabilities in order to better support a wider range of publication requirements, including complex layouts, rich media and interactivity, and global typography features. The expectation is that EPUB 3 will be utilized for a broad range of content, including books, magazines and educational, professional and scientific publications.
Here is a step by step guide on how to convert pdf ebook to epub with free pdf to epub converter-Calibre.
Download the Calibre installer for your operating system, and install as normal. Calibre works on recent versions of Windows, OS X, and Linux. The Calibre installer is very streamlined, so the install process was quite quick.
Calibre is a great application for organizing your eBooks. It can automatically sort your books by their metadata, and even display their covers in a Coverflow-style viewer.
To add an eBook to your library, simply drag-and-drop the file into the Calibre window, or click Add books at the top. Here you can choose to add all the books from a folder and more. Calibre will then add the book(s) to your library, import the associated metadata, and organize them in the catalog.
Once you’ve imported your books into Calibre, it’s time to convert them to the format you want. Select the book or books you want to convert, and click Convert E-books.
Click Ok when you’ve finished choosing your settings and Calibre will convert the book. This may take a few minutes, depending on the size of the PDF. If the conversion seems to be taking too long, you can click Show job details for more information on the progress.
Now, back in the main Calibri window, select your book and save it to disk. You can choose to save only the EPUB format, or you can select Save to disk to save all formats of the book to your computer.