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SIXEL to FB2 Converter

Convert SIXEL graphics to FB2 documents online for free

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Batch Support

Upload multiple SIXEL images and convert them all to FB2 in one session — no need to repeat the process for each individual file.

Fast Conversion

SIXEL to FB2 processing completes in seconds for typical image sizes. Cloud infrastructure keeps turnaround times consistently short.

Simple Workflow

Upload SIXEL, pick FB2, download the result — the three-step process makes converting legacy formats effortless for anyone.

How to convert SIXEL to FB2

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose fb2 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your fb2 file right afterwards

About formats

SIXEL (Six Pixel) is a bitmap graphics encoding format created by Digital Equipment Corporation (DEC) in 1983 for rendering images on character-cell printers and video terminals. The name derives from the encoding's fundamental unit: a column of six pixels represented by a single ASCII character. Each printable character in the sixel data stream (ASCII 63-126) encodes a 6-pixel vertical column, with the character's binary value determining which pixels are on or off. Color is specified through register-based palette control: a Select Color Sequence assigns an HLS or RGB color value to a numbered register, and subsequent sixel characters use that color until another register is selected. The encoding supports raster attributes for specifying pixel aspect ratio and image dimensions, repeat sequences (! followed by a count and character) for run-length compression of identical columns, and $ (carriage return) and - (new line) for navigating the sixel grid. DEC implemented SIXEL support in their VT240, VT241, VT330, and VT340 terminals, as well as multiple printer models. One advantage of the SIXEL encoding is its ASCII-clean nature: the data stream consists entirely of printable characters and standard control sequences, meaning SIXEL graphics can be transmitted through any text-based communication channel — serial terminals, SSH sessions, telnet connections — without requiring binary-safe transport or protocol modifications. The format's modern renaissance provides another remarkable dimension: after decades of obscurity, SIXEL support has been implemented in numerous contemporary terminal emulators, enabling inline image display in command-line workflows. SIXEL output can be generated by ImageMagick, libsixel, chafa, and various plotting libraries.
Initial release: 1983
FB2 (FictionBook) is an XML-based ebook format created by Dmitry Gribov in 2004, designed to provide a clean semantic description of a book's content independent of its visual presentation. Unlike page-layout formats, FB2 encodes structure — title, authors, chapters, annotations, genres, epigraphs, poems, footnotes, and binary attachments (typically cover images) — within a single well-formed XML document. This structural approach means reading applications have full control over rendering, allowing the same file to adapt perfectly to a small phone screen or a large e-ink reader. FB2 became enormously popular in Russia and Eastern Europe, serving as the dominant format on major Russian digital libraries and ebook distribution platforms. One significant advantage is metadata richness: the format's schema mandates detailed bibliographic information including author, translator, series position, publication date, and genre classification, making library management and discovery straightforward. The plain-text XML foundation is another strength — FB2 files are human-readable, easy to validate, and simple to transform using standard XML tools like XSLT. The format specification is freely available on GitHub, and a wide ecosystem of readers, editors, and converters supports it across all major platforms, from desktop applications like Calibre to dedicated e-readers with native FB2 rendering.
Developer: Dmitry Gribov
Initial release: 2004

Frequently Asked Questions

Why convert SIXEL to FB2?

SIXEL images only appear inside terminal emulators. Exporting to FB2 lets you use that artwork in any image viewer or editor.

What programs can open FB2?

FBReader, CoolReader, Calibre, and Moon+ Reader on Android open FB2 files. It is popular among Russian-language ebook readers.

Does SIXEL to FB2 preserve quality?

Since FB2 supports lossless storage, the pixel data carries over without degradation. The result faithfully represents the source SIXEL image.

Is SIXEL to FB2 conversion fast?

Most SIXEL images convert to FB2 within seconds. The exact time depends on the resolution and complexity of the source, but it is typically quick.

Can I queue several SIXEL files for conversion?

Batch conversion is supported. Queue as many SIXEL files as you need and convert them all to FB2 in a single run — no repeating steps manually.