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SIX to DJVU Converter

Convert SIXEL art to DJVU documents online for free

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Quick Turnaround

Most SIX files convert to DJVU within moments. Server-side processing ensures speed regardless of your device capabilities.

Private & Secure

Your SIX uploads are deleted right after conversion, and the DJVU output is removed from servers within 24 hours — your data stays safe.

Multi-File Processing

Queue several SIX files at once and convert them all to DJVU simultaneously. Batch mode streamlines repetitive conversion work.

How to convert SIX to DJVU

1

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

2

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

3

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

About formats

SIX is a file extension for SIXEL (Six Pixel) graphics data, a bitmap graphics format developed by Digital Equipment Corporation (DEC) in 1983 and introduced with the LA50 dot matrix printer. SIXEL encodes images as a sequence of printable ASCII characters, where each character represents a column of six vertical pixels (a 'sixel') — the character's ASCII value minus 63 provides a 6-bit binary pattern, with each bit controlling one pixel in the vertical column. The encoding is structured as a series of sixel bands (each six pixels tall) across the image width, with control sequences for color selection (up to 256 registers with HLS or RGB specification), repeat counts (run-length encoding for efficiency), carriage return, and newline commands. SIXEL data is transmitted to the output device using DEC's standard escape sequence protocol, embedded within the text stream alongside regular character output. Originally designed for DEC's line of printers and later supported by DEC VT-series terminals (VT240, VT330, VT340), SIXEL has experienced a remarkable revival in modern terminal emulator software. One advantage is terminal-native image display: SIXEL allows images to be rendered directly within a text terminal session without requiring a graphical window system, enabling command-line tools to display graphs, photographs, and previews inline with text output. This capability has driven adoption in modern terminals like mlterm, xterm, WezTerm, and foot. SIX/SIXEL data can be generated by ImageMagick, libsixel, and chafa, and viewed in any SIXEL-capable terminal emulator.
Initial release: 1983
DjVu (pronounced "deja vu") is a document format developed at AT&T Labs by Yann LeCun, Leon Bottou, Patrick Haffner, and Paul Howard, first released in 1996. The format was specifically designed for storing scanned documents and images at very high compression ratios while maintaining visual quality suitable for on-screen reading. DjVu achieves this through a layered approach: the document image is separated into a foreground layer (text and line art at full resolution), a background layer (photographs and textures at reduced resolution), and a mask layer that determines which layer is visible at each pixel. This separation, combined with purpose-built compression algorithms for each layer type, typically produces files 5-10 times smaller than equivalent JPEG or PDF scans. One advantage is exceptional compression on scanned pages — a 300 DPI color scan that might occupy 25 MB as TIFF or 500 KB as JPEG typically compresses to 40-80 KB in DjVu while preserving legible text. The progressive rendering model is another strength: DjVu files stream efficiently over networks, displaying a readable low-resolution version almost immediately while progressively refining to full quality. The format supports multi-page documents, embedded text layers for searchability, hyperlinks, annotations, and a shared dictionary mechanism that further compresses collections of similar pages. DjVu is widely used by libraries and archives for digitized historical documents and manuscripts.
Developer: AT&T Labs
Initial release: 1996

Frequently Asked Questions

Why convert SIX to DJVU?

DEC SIX terminal images cannot be opened in regular image viewers. Converting to DJVU preserves the artwork in a portable form.

What programs can open DJVU?

WinDjView, DjView, Evince, Okular, and web-based viewers display DjVu. Mobile apps like EBookDroid also support this format.

Is the conversion from SIX to DJVU lossless?

A small amount of data is discarded during lossy DJVU encoding. For everyday viewing and sharing, the quality difference is imperceptible.

Is SIX to DJVU conversion fast?

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

Can I convert multiple SIX images at once?

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