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FB2 FBZ
File conversion

Convert FB2 to FBZ

Verified by Adam B.· reviewed by FE Editorial ·updated Jun 24, 2026
QUICK ANSWER
Is it possible to convert FB2 to FBZ?
Yes - FB2 converts to FBZ.

Zip the .fb2 file with 7-Zip or any ZIP tool, then rename the result to .fbz. No data is changed - FBZ is lossless ZIP compression of the same FB2 content.

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Tested on macOS, Windows & Linux
Last verified Nov 2026

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Why convert FB2 to FBZ?

An .fbz (also .fb2.zip) is the compressed distribution form of the FB2 format. ZIP compression reduces a typical FB2 file by 60-75% because XML text compresses well, which matters when storing or transferring large e-book libraries.

How to convert FB2 to FBZ

7-Zip FREE

Right-click the .fb2 file, choose 7-Zip > Add to archive, set the format to ZIP, click OK, then rename the resulting .zip to .fbz.

Calibre FREE

Add the .fb2 to your Calibre library and use Save to disk with the .fb2.zip format option to export the compressed file.

About these formats

.FB2 FictionBook 2.0 eBook

An FB2 file is a FictionBook 2.0 e-book - a single, open, DRM-free XML document. Open it with Calibre or FBReader on Windows, Mac, or Linux; FBReader or Cool Reader on Android; FBReader or…

Open .FB2 details →
.FBZ Shadowgrounds game archive file

A .FBZ file is associated with Shadowgrounds game archive, a video file.

Open .FBZ details →

Quality & what to watch

  • No quality loss - ZIP is lossless and the FB2 content inside is byte-for-byte identical to the original.
  • The ZIP archive must contain the .fb2 file at the root level, not inside a subfolder - otherwise some readers will not open it.
  • Use only ZIP compression; 7z, RAR, or BZIP2 archives are not recognized as FBZ by e-book readers.

Frequently asked questions

Is FBZ a different format from FB2?
No - FBZ is an FB2 file stored inside a ZIP archive; the e-book content is identical.
Do I need to convert if my reader already opens `.fb2`?
Probably not - Calibre, FBReader, Cool Reader, and most FB2-capable readers open both .fb2 and .fbz directly.
How do I get the `.fb2` back from an `.fbz`?
Rename the .fbz to .zip and extract it - the .fb2 file is inside.