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SUN to DJVU Converter

Transform SUN data to DJVU format for free

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Batch Uploads

Queue multiple SUN inputs and convert them all to DJVU in one session. Batch processing saves time when you have many files to handle.

Accurate Conversion

Convertio faithfully translates your SUN pixel data into a properly structured DJVU result — preserving visual content throughout.

Visual Fidelity

The SUN to DJVU conversion retains your image content faithfully — colors, details, and dimensions come through intact.

How to convert SUN 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

SUN is a raster image format associated with Sun Microsystems workstations, encompassing both the Sun Raster format (.ras) and the Sun Icon format used for window system icons and cursors on SunOS and Solaris systems. Sun Raster files, identifiable by their 0x59a66a95 magic number, store bitmap images in 1-bit monochrome, 8-bit indexed color, 24-bit BGR, or 32-bit XBGR modes, with optional run-length encoding compression and a 32-byte header. The Sun Icon subset is a simpler text-based format used for small monochrome bitmaps — window icons, cursor images, and toolbar graphics — stored as C-language data arrays that could be directly compiled into X Window and SunView applications. These icon files begin with a comment block specifying width, height, and optionally hot spot coordinates (for cursor images), followed by hexadecimal pixel values in a format readable by both the C compiler and the iconedit tool. Sun workstations running SunOS and later Solaris were foundational platforms for Unix computing, networking, and the early internet, and the SUN image formats were integral to their graphical environments. One advantage is the format's dual text/binary nature: Sun Icons are valid C source code that can be #included directly into applications, a practical approach to resource embedding that predates modern asset management systems. The Sun Raster variant's simplicity provides another strength — the 32-byte header and straightforward encoding make it one of the easiest binary image formats to parse. SUN format files are supported by ImageMagick, GIMP, XnView, and Unix image viewing tools.
Developer: Sun Microsystems
Initial release: 1982
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 SUN to DJVU?

SUN is a legacy format from Sun Microsystems workstations, rarely supported today. DJVU conversion makes the image usable in modern tools.

What programs open DJVU files?

DJVU files can be opened in DjVu viewers (WinDjView, Evince), web browser plugins, and document readers with DjVu support.

Why choose DJVU as the output?

DJVU offers scanned document compression, compact, multi-page. Embedding SUN image data into a DJVU document makes it easy to share and print.

Does converting SUN to DJVU lose quality?

The conversion preserves the visual content of your SUN data accurately. Any differences depend on DJVU's format characteristics like compression type.

Can I convert SUN to DJVU for free?

Yes, Convertio offers free SUN to DJVU conversion. For heavy usage or larger data, premium subscriptions provide additional capacity.

Can I convert multiple SUN data at once?

Yes — Convertio supports batch uploads. Queue several SUN inputs and convert them all to DJVU in a single session to save time.