RB to JBG Converter

RB to JBG conversion — free, online, no setup

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Text-Optimized Output

Convert RB ebook pages into JBG bi-level raster images — a format engineered for maximum compression of text and line art.

Cloud-Powered Conversion

The entire RB to JBG process runs on Convertio servers. Your device does zero heavy lifting during conversion.

Simple Three-Step Flow

Upload the RB file, choose JBG, download the output. No learning curve, no registration walls, no desktop software.

How to convert RB to JBG

1

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

2

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

3

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

About formats

RB is the native ebook format of the Rocket eBook, one of the first commercially available dedicated e-reading devices, developed by NuvoMedia and released in October 1998. Founded by Martin Eberhard and Marc Tarpenning — who later co-founded Tesla Motors — NuvoMedia designed the Rocket eBook as a handheld device with a reflective LCD screen, capable of storing approximately ten books in its internal memory. The RB format packages HTML-based content along with embedded images, metadata, and a table of contents into a single binary container optimized for the device's limited hardware. Content was purchased and downloaded through NuvoMedia's RocketLibrarian desktop software. A notable advantage of the format was its early support for bookmarking, annotation, dictionary lookups, and adjustable font sizing — features now standard on modern e-readers but revolutionary in the late 1990s. The Rocket eBook demonstrated viable commercial demand for dedicated reading devices, paving the way for subsequent platforms from Sony, Amazon, and others. NuvoMedia was acquired by Gemstar-TV Guide International in 2000, which discontinued the device line in 2003. While RB files are largely a historical curiosity today, they can be converted to modern formats using ebook management tools, and the format remains significant as a pioneering chapter in the evolution of digital reading.
Developer: NuvoMedia
Initial release: 1998
JBG is a file extension for images compressed using the JBIG (Joint Bi-level Image experts Group) standard, formally ITU-T Recommendation T.82, completed in 1993 as a successor to the Group 3 and Group 4 fax compression standards. JBIG compression is designed for bi-level (black and white) images but can also handle grayscale and limited-color images by encoding each bit plane separately. The algorithm uses a form of arithmetic coding guided by an adaptive context model: for each pixel, the encoder examines a template of surrounding already-coded pixels to build a probability estimate, then feeds this estimate to a QM-coder (a variant of the Q-coder arithmetic coder) that produces a highly efficient binary output. JBIG achieves 20-40% better compression than Group 4 on typical document images, with the improvement being even larger on halftoned photographs and images with gradual density transitions where Group 4's simple run-length approach is less effective. The standard supports progressive encoding, where a low-resolution version of the image is transmitted first and progressively refined — useful for fax-like applications where the receiver can begin displaying the image before the full-resolution data arrives. One advantage is superior compression of documents containing halftone images: newspapers, magazines, and marketing materials that mix text with photographic halftones compress dramatically better with JBIG than with Group 3/4. The standard's ITU-T backing ensures it is implemented in document imaging hardware and software worldwide. JBG files are supported by ImageMagick and various document imaging tools.
Initial release: 1993

Frequently Asked Questions

Why convert RB to JBG?

RB is a 1998 format no modern app supports. JBG produces highly compressed 1-bit raster images — ideal for faxing or archiving text pages.

What software reads JBG files?

IrfanView, XnView, ImageMagick, and the jbigkit tools can all open and process JBG (JBIG) compressed image files.

Is JBG good for text content?

Excellent — JBIG compression was designed specifically for bi-level (black and white) content like scanned documents and text pages.

How long does the conversion take?

Seconds at most. RB ebooks are small files, and Convertio cloud servers process them almost instantly.

Is there a cost to convert?

RB to JBG conversion is free on Convertio. Paid plans are available for users needing batch operations or larger file handling.