XBM to RB Converter

Turn XBM images into RB e-reader format online

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E-Book Conversion

Transform XBM graphics into RB e-book format — your images become accessible on Kindle, Kobo, and other reading devices.

Secure Processing

Uploaded XBM images are erased right after conversion, and the resulting RB files are purged within 24 hours — your data stays private.

Effortless Process

Converting XBM to RB takes just a few clicks — no technical knowledge required. Upload, choose your format, and download the result.

How to convert XBM 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

XBM (X BitMap) is a monochrome (1-bit) image format defined as part of the X Window System, originating at MIT around 1987. XBM files are unique among image formats in being valid C source code: each file defines the image as a static array of unsigned char values containing the packed pixel data, preceded by #define statements specifying the image width, height, and optional hot-spot coordinates (for cursor images). The pixel data is stored in hexadecimal byte values within curly braces, with each bit representing one pixel (1 = foreground, 0 = background) and bits ordered LSB-first within each byte. This design was intentional — XBM images could be #included directly into X Window application source code and compiled into the binary, eliminating the need for external file loading and runtime format parsing. The format was used throughout the X11 ecosystem for cursor shapes, window icons, toolbar buttons, and other small UI elements. One advantage is the source-code nature of the format: XBM files can be edited with a text editor, diff'd and merged in version control, generated by shell scripts, and compiled directly into C programs without any image loading library — a level of toolchain integration that no binary image format can match. The format's role as part of the X Window standard ensures it is understood by every X11-aware toolkit and application. While limited to monochrome and no compression, XBM's simplicity makes it an excellent teaching format for understanding bitmap representations. XBM files are supported by all X11 applications, ImageMagick, GIMP, web browsers (as a legacy web format), and programming environments.
Developer: MIT X Consortium
Initial release: 1987
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

What is the reason to convert XBM to RB?

RB (early e-book reader format) lets you include XBM graphics in e-book collections, accessible on dedicated readers and mobile apps.

How do I open a RB file?

Software that handles RB includes Calibre, RocketBook viewer — giving you options on every major operating system.

Is my XBM file safe when converting online?

Your files are secure. Uploaded XBM images are erased immediately after processing, and RB outputs are purged within 24 hours.

Can I convert multiple XBM files to RB at once?

Yes — upload several XBM files in one session and Convertio processes them all into RB simultaneously, saving you time.

Is XBM to RB conversion free?

Standard conversions are available for free on Convertio. Larger volumes or higher usage may benefit from a premium plan for additional capacity.

Does converting XBM to RB affect quality?

Quality is maintained to the extent RB supports. Since XBM is a monochrome bitmap from the X Window System, the visual data transfers cleanly to RB.