The ePub format is one of the many open source eBook file formats available. Initially released in 2007, it succeeded the legacy Open eBook format. The format was first defined by the Open eBook forum, part of the international digital publishing forum. EPUB digital books and publications all have the associated .epub extension and can be opened and viewed on any compatible device, software application, smartphone, or dedicated reader. The format is capable of optimizing the resolution of digital publications to suite the resolution of the device being used, making it inherently a 'reflowable' format.
The .rb extension is used for many formats which include definition files based on the Fuzzy rule, eBook files of the Rocket Edition, class files of Ruby on Rails, project files of REALbasic and the profile configuration files of Rosebud. Other versions of Ruby which are also called gems include Mongrel, Capistrano and Ruby on Rails.
FreeFileConvert uses tuned encoding for EPUB to RB conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload EPUB files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized RB results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent RB audio with dependable progress tracking.
The EPUB or electronic publication format is formally standardized in ISO/IEC TS 30135. Its structure is an extension of XHTML and XML and has optional support for cascaded style sheets. The format allows for documents that contain images either in raster or vector graphics format. Digital rights management is also supported.
Upload your ebook file in the EPUB format from your device, Dropbox, or Google Drive.
Select RB as the output format and click Convert. Adjust optional settings if needed.
Download the converted ebook file. Each file stays available for up to 5 downloads.