EPUB to RB Converter

Online EPUB to RB — Rocket eBook format, free

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Rocket eBook Output

Convert your EPUB ebooks into RB format — the native file type for vintage Rocket eBook hardware and compatible readers.

No Downloads Required

The converter runs entirely in your browser. No plugins or desktop apps needed — just upload, convert, and download.

Private Conversion

Uploaded EPUB files are erased immediately after processing. RB outputs are removed from servers within 24 hours automatically.

How to convert EPUB to RB

1

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

2

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

3

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

About formats

EPUB (Electronic Publication) is an open ebook standard originally developed by the International Digital Publishing Forum (IDPF) and now maintained by the W3C following the organizations' merger in 2017. The first version carrying the EPUB name was approved in October 2007 as a successor to the Open eBook Publication Structure (OEBPS). An EPUB file is essentially a ZIP archive containing XHTML or HTML5 content documents, CSS stylesheets, images, fonts, and metadata organized according to the Open Packaging Format and Open Container Format specifications. The current major version, EPUB 3, supports reflowable and fixed-layout content, embedded multimedia, JavaScript interactivity, MathML equations, and rich accessibility features including semantic markup and media overlays for synchronized text and audio. A defining advantage is universal device support — unlike proprietary formats, EPUB works natively on virtually every non-Kindle e-reader, tablet, and reading application, from Apple Books and Google Play Books to Kobo and dozens of third-party apps. The reflowable text model is another core strength, automatically adapting pagination, font size, and margins to match any screen dimension and user preference. EPUB's open specification and active W3C stewardship ensure long-term preservation and vendor independence, making it the de facto standard for digital publishing across libraries, academic institutions, and commercial retailers worldwide.
Initial release: October 2007
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

Frequently Asked Questions

Why convert EPUB to RB?

RB is the format for Rocket eBook — one of the earliest e-readers. Converting EPUB to RB keeps vintage devices loaded with readable content.

What devices support RB files?

The NuvoMedia Rocket eBook and REB 1100/1200 devices read RB natively. Some retro-computing emulators also handle the format.

Does the conversion preserve chapters?

Basic text structure and chapter breaks carry over. Advanced EPUB formatting is simplified to match RB capabilities.

Is the RB format still relevant?

Primarily for collectors and retro-tech enthusiasts who maintain working Rocket eBook hardware — a niche but dedicated community.

Is EPUB to RB free?

Yes — Convertio offers this conversion at no cost. Paid plans add extended file size support and priority processing.

Can I convert a batch of EPUBs?

Yes, upload several EPUB files at once and convert them all to RB in a single batch, saving time on repeated uploads.

EPUB to RB Quality Rating

4.7 (38 votes)
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