Free Online RB to JBIG Converter

Was developed for the first mass-produced e-book reader – Rocket eBook. The format is written in Ruby. RB files are containers holding the entire content for a Rocket eBook device. It has DRM protection capability which is not used in the books published at present due to the format’s lack of popularity.

JBIG is a standard for lossless compression of image formats. Despite the fact that it was initially developed for fax machines, it can be easily used for other types of images. Files saved in the JBIG format are smaller in comparison with the other industry standard formats like G3 or G4.