EPUB (short for electronic publication; alternatively capitalized as ePub, ePUB, EPub, or epub, with "EPUB" preferred by the vendor) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub.

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.

However, I found many people want to know how to convert html to epub as below.

Q: Convert epub to HTML
I have an eBookwise 1150 - it is my best friend I normaly opt for the HTML format when buying books because I can go to WORD and then format it the way I like to read it.

My question is How does one turn the epub into HTML format? I read somewhere to go and change the ending into zip and then open it. But that way it does not come up in one book like other HTMLs but rather in seperate chapters to be opened seperately. That is too time consuming.

Can anyone help with the conversion?

Luckily, a friend of mine recommended me a HTML to EPUB Converter which he tried very great. I download the free trial and found it's very easy to use, and can convert HTML to EPUB eBooks with all original elements. Then I bought it without any hesitating. If you have the same problem with me, maybe you can try it. Learn the details about how to convert HTML to EPUB! Hope to help you.