JBIG to SUN Converter

Quick JBIG to SUN conversion — no install required

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Secure Processing

Source JBIG files are deleted instantly after conversion. SUN output files are auto-removed within 24 hours.

Multiple Files

Process several JBIG files in a single session. Each produces a separate SUN file for individual download.

Archive Unlock

Unlock JBIG document archives by converting to SUN — viewable everywhere without JBIG-compatible tools.

How to convert JBIG to SUN

1

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

2

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

3

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

About formats

JBIG (Joint Bi-level Image experts Group) is a lossless image compression standard (ITU-T T.82) published in 1993, developed by a committee of experts drawn from the same international standards bodies that created JPEG. While the extension .jbig and .jbg refer to the same underlying compression standard, .jbig is the more explicit form commonly used in software that handles the raw JBIG-compressed datastream. The compression algorithm centers on context-dependent arithmetic coding: before encoding each pixel, the encoder examines a configurable template of 10 to 16 nearby pixels (a mix of neighbors from the current and previous lines) to determine a context — one of thousands of possible local pixel configurations. Each context maintains its own adaptive probability estimate that is continually updated as encoding proceeds, allowing the coder to exploit the statistical patterns unique to each image region. This approach handles text, line art, halftoned photographs, and mixed-content pages with a single algorithm, achieving consistently better compression than the fixed Huffman tables of Group 3 or the simpler prediction model of Group 4. A later revision, JBIG2 (T.88), added pattern matching and lossy modes for even higher compression, but the original JBIG remains widely deployed. One advantage is the algorithm's adaptiveness: unlike Group 3/4 codecs that use fixed statistical models, JBIG continuously learns the characteristics of each specific image as it encodes, providing near-optimal compression across widely varying content types. The standard is embedded in many multifunction printers and document scanners for internal image handling. JBIG files are processable by ImageMagick, jbigkit, and enterprise document imaging systems.
Initial release: 1993
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

Frequently Asked Questions

Why convert JBIG to SUN?

SUN is universally supported. Converting JBIG images to SUN enables viewing on any device or platform.

Which viewers support SUN?

Open SUN files using IrfanView, XnView, or Sun/Solaris image tools.

Will the SUN result match JBIG quality?

JBIG to SUN conversion is lossless for document content. Lines, text, and graphics all remain intact.

Does converting JBIG to SUN cost money?

No — standard conversions cost nothing. Premium plans offer higher limits for power users.

Does the converter accept multiple uploads?

Yes — the converter handles multiple files per session. Each JBIG upload converts to SUN on its own.

Does the converter work on mobile devices?

Yes — the JBIG to SUN converter is fully responsive. It works on phones, tablets, and any device with a browser.