Convert Documents to RB eBook Online — Free RB Converter
This free online converter transforms documents from a wide range of formats into RB eBook (.rb) files, ready for use on compatible e-readers. No software installation or account required — just upload, convert, and download.
What is the RB eBook format?
RB (RocketBook) is a proprietary eBook format originally developed for the Rocket eBook reader, one of the earliest dedicated e-reading devices launched in the late 1990s. RB files store formatted text and basic layout data in a compact binary structure optimised for low-power handheld screens. While the Rocket eBook hardware is long discontinued, RB files remain of interest to collectors, digital archivists, and users of modern emulators that support legacy e-reader formats.
When would you convert to RB?
- Digital archiving: Preserving older eBook collections in a historically accurate format.
- Emulator compatibility: Running titles on software emulators that replicate the original Rocket eBook experience.
- Format research: Studying early commercial eBook standards for academic or publishing-history purposes.
- Personal collections: Converting personal documents or public-domain texts into RB for use on legacy hardware still in working condition.
Supported input formats
The converter accepts a broad range of source document types, including common word-processing formats such as DOC, DOCX, ODT, and RTF, as well as other eBook formats like EPUB, MOBI, FB2, LIT, PDB, and PDF. Plain-text files (TXT) are also supported, making it straightforward to convert almost any readable document into an RB eBook without needing dedicated desktop software.
Frequently asked questions
Is this RB converter free to use?
Yes, the converter is completely free. No subscription, account, or payment is required to convert documents to RB format.
What happens to my uploaded files after conversion?
Uploaded files are processed on the server solely to perform the conversion and are deleted automatically afterwards. They are not stored, shared, or used for any other purpose.
Which devices or apps can open RB files?
RB files were designed for the original Rocket eBook reader. Today they are primarily opened using legacy emulator software or archival e-reader applications, as mainstream modern devices generally do not support this format natively.
Can I convert an EPUB or MOBI file to RB?
Yes. Common eBook formats such as EPUB, MOBI, LIT, and FB2 are all accepted as input, so you can cross-convert between eBook standards easily.
Will the formatting of my document be preserved?
Basic text structure and paragraph formatting are carried over during conversion. However, complex layouts, embedded fonts, or advanced styling may be simplified, as the RB format has limited support for rich formatting compared to modern eBook standards.