TO READ OUR E-BOOKS
EPUB 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 an EPUB reader can optimize text for each particular display device.
The easiest way to open an EPUB file is to double-click on it and let your PC or tablet decide which default application should open the file. If no program opens the EPUB file then you probably don't have an application installed that can view the EPUB files.
EPUB files can also be opened on a computer or tablet with various free programs, one of them is FBReader, which is free source.
Internet site of FBReader.
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Plenty of iPhone and Android apps also exist that allow viewing of EPUB files. There's even a Firefox Add-on, EPUBReader, that allows you to read EPUB files in the browser just like other documents.