FB2 to EPUB Converter

What is FB2 to EPUB Conversion?

FB2 to EPUB conversion is the process of transforming an ebook from the Russian XML-based FictionBook format into the international open EPUB standard. During conversion the full text of the work, chapters, sections, cover image, book metadata (author, title, genre, annotation), footnotes, and illustrations are preserved. The resulting file can be opened in any modern e-reader device or reading application that supports EPUB.

The FB2 format (FictionBook 2.0) appeared in Russia in 2004 and became a popular standard for fiction in the Russian-speaking internet. It is an XML document with a clear structure: sections, chapters, paragraphs, citations, epigraphs, and metadata. The cover image and illustrations are stored inside the XML as base64-encoded binary data. The format is convenient for cataloging and automatic text processing, but outside of the Russian-speaking audience it is rarely used.

EPUB (Electronic Publication) is an open ebook standard developed by the International Digital Publishing Forum. EPUB 2 and EPUB 3 support modern layout features: scalable fonts, multimedia, and interactive elements. Technically an EPUB file is a ZIP archive containing XHTML documents, CSS stylesheets, images, and metadata in OPF format. EPUB is supported by practically every e-reader and reading application in the world, with the exception of older Amazon Kindle models.

PEREFILE converts FB2 to EPUB while preserving the book structure, cover, metadata, and layout. Conversion happens in the browser, with no need to install desktop ebook software on your computer.

Why Convert FB2 to EPUB

Compatibility with International E-Readers

Most modern devices and applications for reading ebooks are oriented around EPUB:

• Apple Books on iPhone, iPad, and Mac - native EPUB support, FB2 does not open
• Google Play Books - accepts EPUB when uploaded to your cloud library
• Kobo - the entire range of e-readers uses EPUB as the primary format
• PocketBook - supports both formats, but EPUB delivers more consistent layout
• Modern Kindle models - after the 2022-2023 updates, accept EPUB via Send to Kindle

Long-Term Library Storage

EPUB is an international standard that is actively developed and supported by the largest device manufacturers and application developers. In 10-20 years EPUB files are virtually guaranteed to remain readable. The FB2 format is supported primarily by enthusiasts and a small group of developers, and its prospects as a living standard are less clear.

Universality Across Devices

If you use several devices from different manufacturers - an Android smartphone, an iPad tablet, a Kobo e-reader - it is more convenient to keep your library in a single universal format. EPUB opens identically on every device, and syncing through cloud services becomes simpler.

Sharing Books With Other People

If you want to share a book with a foreign reader or someone using a device without FB2 support, EPUB solves the problem. The recipient will be able to open the book in any convenient application.

FB2 vs EPUB Format Comparison

The key architectural difference: FB2 is a monolithic XML with embedded binary data, while EPUB is a structured archive with a separation between content and presentation. The EPUB archive is more convenient for parsing, partial loading, indexing, and automatic processing.

When to Use EPUB Instead of FB2

Buying a New E-Reader

If you have bought a new Kobo, Boox, PocketBook model or plan to use an iPad for reading, converting your library to EPUB will provide the most convenient experience. On many devices FB2 is either not supported at all or is displayed with loss of formatting.

Switching to Apple Books

The Apple ecosystem - iPhone, iPad, Mac - works with EPUB as its primary format. EPUB books can be synced between devices through iCloud, read with automatic position saving, annotated with notes and bookmarks. FB2 does not open in Apple Books without third-party applications.

Uploading to Cloud Services

Google Play Books, Adobe Digital Editions, and many library services specifically accept EPUB. Uploading FB2 to them is either impossible or requires server-side conversion (which is not always done correctly).

Working Across Multiple Apps

EPUB can be opened in dozens of applications on any platform: Apple Books, Google Play Books, Kindle (new versions), Moon+ Reader, ReadEra, Lithium, Marvin, and many more. This gives you the freedom to choose your preferred reading app.

FB2 Features: Structure and Metadata

Rich Semantic Markup

FB2 supports a wide range of specialized tags that describe the structure of a literary text:

• section - sections and chapters with arbitrary nesting
• title - section headings
• epigraph - epigraphs with author attribution
• cite - citations with optional source reference
• poem - poems with stanzas and lines
• subtitle - subheadings within sections
• annotation - book annotation

During conversion to EPUB, these elements are transformed into the corresponding HTML constructs with appropriate CSS classes that preserve the semantics.

Book Metadata

The FB2 structure includes a description section with detailed information:

• Author, translator, book designer
• Title of the work and series
• Genres (based on the FictionBook classifier)
• Publication year, ISBN, publisher
• Annotation, keywords
• Source of the electronic version
• File change history

In EPUB this data is transferred into the OPF file using the Dublin Core standard, which makes the book properly indexable in library applications.

Russian Localization

FB2 was designed with Russian typography and language conventions in mind. During conversion to EPUB the following are preserved:

• Cyrillic text in UTF-8 encoding
• Typographic quotation marks and dashes
• Ellipses, non-breaking spaces
• Special characters and diacritics

Which FB2 Files are Suitable for Conversion

PEREFILE works with FB2 files of any origin:

• Files from public libraries - books downloaded from legal sources
• Self-authored books - works created by authors in FB2 editors
• Files converted from other formats - FB2 obtained earlier from DOC, TXT, HTML
• Files in windows-1251 - older FB2 files in legacy encoding are re-encoded correctly
• Books with illustrations - the cover and internal images are preserved

Not recommended for conversion:

• Damaged XML files with syntax errors - they need to be repaired first
• FB2.ZIP archives - unpack the archive in advance

Advantages of the EPUB Format

Reflowable Layout

EPUB supports flexible text reflow. The book adapts to screen size: compact on a smartphone, larger on a tablet, comfortably sized on an e-reader. The user can adjust font size, line spacing, and margins independently.

Styling Through CSS

The visual presentation in EPUB is described through cascading style sheets. This allows fine-tuning of how elements appear: fonts for headings, formatting for citations, footnote styling, poem layout. CSS styles are universal and supported by all modern e-readers.

Advanced EPUB 3 Capabilities

The third version of the standard adds modern features:

• Embedding fonts directly inside the book
• Multimedia: audio and video inside the book
• Interactive elements and scripts
• MathML for mathematical formulas
• SVG graphics for illustrations
• Japanese and Arabic typography

These capabilities are used primarily in educational and academic editions, but works of fiction can also include decorative fonts and SVG covers.

Support for Accessibility Standards

EPUB was designed with the needs of visually impaired readers in mind. Screen reader software handles EPUB correctly, making ebooks accessible to readers with limited vision.

Specifics of FB2 to EPUB Conversion

Cover Image Extraction

In FB2 the cover is stored as a base64 string inside the XML; in EPUB it is a separate image file inside the ZIP archive. During conversion the cover is decoded and placed in the archive, with a reference written into the OPF file. This reduces overall file size and speeds up cover display in the e-reader library.

Image Handling

Internal FB2 images are also extracted and saved as separate files. In the text they are replaced with HTML img tags referencing the corresponding files inside the archive.

Table of Contents Generation

EPUB includes a dedicated table of contents file (NCX in EPUB 2, navigation document in EPUB 3). During conversion the FB2 section hierarchy is turned into a full table of contents with jump-to-chapter navigation. In the reader the TOC appears on a dedicated screen accessible through gestures or buttons.

Metadata

Information about the author, title, language, and genres is transferred to the OPF file using the Dublin Core standard. This ensures correct display in the reader library, proper sorting, and filtering by genre.

Who Benefits from FB2 to EPUB Conversion

Owners of Kobo, Boox, reMarkable

These e-readers either do not support FB2 at all or display it with limitations. EPUB delivers proper layout and full functionality: font settings, search, bookmarks, dictionaries.

Users of the Apple Ecosystem

Apple Books on iPhone, iPad, and Mac conveniently syncs the library through iCloud. Just upload the EPUB to Apple Books on one device and the book will appear on all the others.

Expats and Travelers

Russian-speaking readers abroad often find that local services and devices do not support FB2. An EPUB library works the same way in any country.

Ebook Collectors

If you maintain a large library and want to store it in a universal, long-lived format, EPUB is the best choice. In 15-20 years compatibility will most likely still be there.

Authors and Publishers

Self-publishing authors and independent publishers most often distribute books in EPUB, since this format is accepted by all the major distribution platforms: Apple Books Store, Google Play Books, Kobo Writing Life.

Format History

FB2: The Era of Russian Digital Libraries

The FictionBook format was proposed by Dmitry Gribov in 2004 as a response to the problem of storing Russian-language literature in electronic form. Closed formats of commercial readers were unsuitable for free book exchange, and plain text files lost the structure of the work.

FB2 quickly became the standard for large public libraries: Lib.ru, Flibusta, and Litres (in its early days). Thousands of works of Russian and foreign classics were digitized and made available in FB2.

EPUB: International Standardization

The EPUB format is developed by the International Digital Publishing Forum consortium (since 2017 part of the W3C). The first version, EPUB 2, appeared in 2007; EPUB 3 followed in 2011. Each update extends the format without breaking backward compatibility.

EPUB became the foundation of all major ebook platforms: Apple Books, Kobo Writing Life, Google Play Books, Barnes & Noble Nook. It is the de facto international standard.

Recommendations for Quality Conversion

Preparing the Source FB2

Before conversion, make sure that the FB2 is valid:

• The file opens in an FB2 reader without errors
• The XML markup is not damaged
• The encoding is detected correctly (UTF-8 or windows-1251)
• The cover is displayed in its place

After Conversion

Open the resulting EPUB in several readers to verify:

• Correct text rendering and formatting
• The table of contents works
• The cover appears in the library
• Metadata is correct (author, title)

Loading Onto a Device

Ways to transfer EPUB to your e-reader:

• Via USB cable by copying files
• Through the cloud service of the e-reader manufacturer
• Via email (for Kindle models that support EPUB)
• Through companion smartphone apps

Limitations and Nuances

Most FB2 files convert without issues. Potential complications:

• Very large cover images - high-resolution images increase EPUB size
• Non-standard elements - custom FB2 extensions from individual publishers may be handled in a generic way
• Complex poetry - multi-level poem formatting is adapted to EPUB capabilities

If you discover layout issues in the result, the EPUB can be opened in a specialized ebook editor and fine-tuned manually.