RB to PBM Converter

Convert Rocket eBook to PBM bitmap — free, online

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Simple Bitmap Output

Convert RB ebook pages to PBM — a dead-simple monochrome format ideal for image processing scripts and pipelines.

Server-Side Work

Convertio servers handle the entire rendering process. Your device stays completely idle during RB to PBM conversion.

Secure Pipeline

Uploaded RB files are deleted right after processing. PBM output files are automatically purged within 24 hours.

How to convert RB to PBM

1

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

2

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

3

Let the file convert and you can download your pbm 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
PBM (Portable Bitmap) is the monochrome (black and white, 1-bit) member of the Netpbm family of image formats, created by Jef Poskanzer in 1988 as part of the Pbmplus toolkit for Unix systems. The format exists in two variants: ASCII (magic number P1), where each pixel is represented as a text character '0' (white) or '1' (black) separated by whitespace, and binary (magic number P4), where pixels are packed eight per byte for compact storage. Both variants begin with a plain-text header specifying the magic number, image width and height, and optional comments. PBM was designed as the simplest possible image format — a bridge format for converting between the many incompatible raster formats that proliferated across different Unix systems and applications during the 1980s. The Netpbm philosophy was to convert any source format to PBM/PGM/PPM as an intermediate step, then convert to the target format, using the portable formats as a universal exchange layer. One advantage is extreme simplicity — the ASCII variant can be literally typed by hand in a text editor, and both variants are trivial to parse and generate in any programming language without external libraries. The format's role as a universal image processing intermediate is another strength: hundreds of Netpbm command-line tools accept PBM input, enabling complex image manipulation pipelines through Unix pipes. PBM remains used in computer science education, OCR preprocessing, and any context where a dead-simple monochrome image representation is needed.
Developer: Jef Poskanzer
Initial release: 1988

Frequently Asked Questions

Why convert RB to PBM?

RB is a dead 1998 format. PBM is a simple, standardized bitmap format — great for scripting, image processing, or Unix pipelines.

What opens PBM files?

GIMP, IrfanView, XnView, ImageMagick, and any Netpbm-compatible tool can open PBM files. Most Linux image viewers also work.

Is PBM a color format?

No, PBM is strictly monochrome (1-bit black and white). For grayscale, use PGM — for color, use PPM from the same family.

How fast is the conversion?

Seconds. PBM files are extremely simple, so rendering and encoding on Convertio servers happens almost immediately.

Is this service free?

Yes, RB to PBM conversion is free on Convertio. Premium subscriptions provide more capacity and priority processing.