Plain Text (.txt) This is the simplest e-book format there is. Although it doesn’t preserve any formatting such as italicized or bold text, it is readable on any computer and files in TXT format are smaller in size than any other format. For the visually-impaired, plain text is the easiest format to read using screen reading software. However, it isn’t very aesthetically pleasing to sighted readers. Hypertext Markup Language (.html, .) If you’ve ever used a web browser such as Internet Explorer, , or Safari, you’re already familiar with HTML documents. They’re the most basic building block websites use to convey information to visitors. HTML files can be opened in any web browser, though different programs may display the files differently. Stories published on the web that aren’t avail