DOCX to RB Converter

Convert DOCX to RocketBook RB format — free online

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

RocketBook eBooks

Turn your DOCX documents into RB format for reading on NuvoMedia RocketBook hardware and compatible eBook applications.

Instant Results

Server-side processing generates your RB file in seconds. No eBook tools to install or configure on your machine.

Private and Secure

Uploaded DOCX files are deleted right after conversion. RB output is purged within 24 hours — your content stays safe.

How to convert DOCX 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

DOCX is the default document format for Microsoft Word since Office 2007, based on the Office Open XML (OOXML) standard published as ECMA-376 and adopted as ISO/IEC 29500. A DOCX file is a ZIP archive containing XML documents that describe the document body (document.xml), styles, themes, headers, footers, footnotes, comments, numbering definitions, and relationships between parts. Media assets like images and embedded objects reside in dedicated directories within the package. The XML structure means document content is human-inspectable and programmable — developers can create, modify, and extract content from DOCX files using standard XML libraries in any programming language without requiring Word. One significant advantage is openness and interoperability: the published specification enables any software to implement DOCX support, and the format is read and written by LibreOffice, Google Docs, Apple Pages, and dozens of other tools across all platforms. Built-in ZIP compression is another practical strength — DOCX files are substantially smaller than equivalent DOC files, and the modular XML structure improves crash recovery since corruption in one part does not necessarily destroy the entire document. The format supports all modern Word capabilities including SmartArt, content controls, bibliography management, accessibility metadata, and real-time co-authoring. DOCX has become the universal standard for document interchange in business, education, and government.
Developer: Microsoft
Initial release: January 30, 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 DOCX to RB?

RB (RocketEdition) is a legacy eBook format used by NuvoMedia RocketBook readers. Converting makes your content accessible on those devices.

What opens RB files?

RocketBook-compatible devices read RB natively. Calibre can also open, view, and convert RB files on desktop computers.

Is the text preserved?

Text content and basic formatting transfer to RB. Complex DOCX features like tables and embedded objects may be simplified.

Can I convert several files at once?

Yes — Convertio supports batch uploads. Add multiple DOCX files and convert them all to RB simultaneously.

Is it free?

DOCX to RB conversion is free on Convertio. Premium plans offer larger file sizes and faster queue priority.

Does it work in any browser?

Yes. Convertio is browser-based — Chrome, Firefox, Safari, Edge, and others all work. No plugins or downloads needed.

DOCX to RB Quality Rating

4.2 (80 votes)
You need to convert and download at least 1 file to provide feedback!