What Is an FB2 File?

How to open and convert FB2 files

A file with the FB2 file extension is a FictionBook eBook file. The format was built to cater to fictional writings, but can, of course, be used to hold any type of eBook.

FB2 files are DRM-free and can contain footnotes, images, text formatting, Unicode, and tables, all of which may or may not be supported in some FB2 readers. Any images used in the book, like PNGs or JPGs, are converted to Base64 (binary) and stored within the file itself.

Unlike other eBook files like EPUB, the FB2 format is just a single XML file.

Some FB2 files are held in a ZIP file and are therefore called *.FB2.ZIP.

How to Open an FB2 File

FB2 Files

There are many FB2 file readers available on nearly all platforms. However, before trying to get your book to open on your phone, computer, etc., make sure you've actually got an FB2 file...

If you can't open your file in the programs mentioned below, double-check that you're reading the file extension correctly. You might actually be dealing with an entirely different format, like FBC, FBX (Autodesk FBX Interchange), FBR, FB! (FlashGet Incomplete Download), or FBW (HP Recovery Manager Backup).

From a Computer

You can read FB2 files on a computer with lots of programs, including Calibre, Cool Reader, FBReader, STDU Viewer, Athenaeium, Haali Reader, Icecream Ebook Reader, OpenOffice Writer (with the Ooo FBTools plug-in), and probably some other document and eBook readers.

Some web browsers support add-ons that enable the viewing of FB2 files, like FB2 Reader for Firefox.

Since many of these files are contained within a ZIP archive, most FB2 file readers accommodate this by reading the *.FB2.ZIP file directly without having to extract the .FB2 file first. If not, you may need to use a free file extractor like 7-Zip to get the file out of the archive.

If you read a lot of eBooks on your computer, you probably have at least one of these programs already installed. If that's the case, and you double-click on an FB2 file but it opens in a program that you'd rather not it open in by default, please know that you can change which program opens what kind of files.

From a Phone or Tablet

You can read FB2 books on iPhones, iPads, Android devices and more using a mobile app. There are all sorts of eBook reading apps available but these are just a few that work with FB2 files...

On iOS, you can install FBReader or KyBook to load FB2 files directly to your iPhone or iPad. BReader and Cool Reader are examples of free apps that can read the file on Android devices.

From an E-Reader Device

Most popular e-readers, like Amazon's Kindle and B&N's Nook, don't currently support FB2 files natively, but you can always convert your eBook into one of the many formats supported by your eBook. See below for more on that.

The PocketBook is an example of an eBook device that does support this format.

How to Convert an FB2 File

Converting an FB2 file can be accomplished with a free file converter like the online converter Zamzar. This website can convert FB2 to PDF, EPUB, MOBI, LRF, AZW3, PDB, PML, PRC, and other similar eBook and document formats.

Another option is to use one of the viewers mentioned above, like Calibre. There, you can use the Convert books button to choose among many formats to save the FB2 file to.

In other programs, check for an option like Convert, Save As, or Export, and then choose from the list of formats you're given. Every program does this a little differently but it's not hard to find if you dig around a bit.

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