RB to LRF Converter

Convert Rocket eBook to Sony LRF — free, online

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Ebook Format Bridge

Move content from the obsolete RB format to LRF — a dedicated Sony Reader format for comfortable on-device reading.

Fast Turnaround

RB to LRF conversions finish in seconds thanks to optimized cloud infrastructure. No waiting, no local processing.

Automatic Deletion

All uploaded RB files and converted LRF outputs are automatically purged from Convertio servers within 24 hours.

How to convert RB to LRF

1

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

2

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

3

Let the file convert and you can download your lrf 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
LRF is the file format associated with Sony's BBeB (Broadband eBook) specification, jointly developed by Sony and Canon and introduced in 2004 with the Sony Librie EBR-1000EP — the world's first commercial E Ink e-reader. The format supports both reflowable text and fixed-layout page rendering, embedding fonts, images, vector graphics, and metadata within a compact binary container. LRF files use a block-based internal structure with object trees describing page layouts, text streams, image resources, and table of contents navigation. Sony's Reader devices and the companion desktop software (Sony Reader Library) served as the primary ecosystem for LRF content throughout the mid-2000s. A key advantage was its early adoption of high-quality font embedding and text rendering optimized specifically for E Ink displays, delivering a reading experience noticeably superior to many competing formats of the era. The format also supported bookmark synchronization, dictionary lookups, and annotations within the Sony Reader ecosystem. However, Sony officially discontinued BBeB/LRF support in 2010, migrating its Reader platform to the industry-standard EPUB format. Today LRF files are primarily encountered in personal ebook collections from that period and can be converted to modern formats using tools like Calibre. The format remains a historically significant milestone as the native format of the device category that launched the modern e-reader revolution.
Developer: Sony
Initial release: 2004

Frequently Asked Questions

Why convert RB to LRF?

RB is a 1998 format nobody supports. LRF works on Sony Reader devices, letting you carry old ebook collections on Sony hardware.

What devices read LRF files?

Sony PRS-series e-readers natively read LRF. Calibre on desktop can also open and manage LRF ebook files on any platform.

Does the conversion keep the book text intact?

Yes, all readable text from your RB file transfers to the LRF output. Basic paragraph structure is also maintained.

How long does RB to LRF take?

Typically under ten seconds. Convertio handles everything on its servers, so your device does none of the processing.

Is there a fee for this conversion?

No, RB to LRF conversion is free on Convertio. Paid plans give you higher file size limits and faster queue priority.

RB to LRF Quality Rating

3.0 (1 votes)
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