RB to PICON Converter

Convert Rocket eBook to PICON icons — free, online

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Thumbnail Icons

Turn RB ebook pages into PICON — tiny personal icon thumbnails that provide visual previews of page content.

Near-Instant Speed

PICON images are minuscule, making the full RB to PICON conversion pipeline one of the fastest available.

Secure Process

Uploaded RB files are erased right after conversion. PICON outputs are deleted from servers within 24 hours.

How to convert RB to PICON

1

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

2

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

3

Let the file convert and you can download your picon 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
PICON (Personal Icon) is a small-format image type used in the X Window System ecosystem, developed by Steve Kinzler at Indiana University around 1990 as part of the picons (personal icons) database project. Picons are small, typically 48x48 pixel, color images used as visual identifiers for people, organizations, domains, and Usenet newsgroups in Unix mail readers, news readers, and other communication tools. The picon format is essentially an XPM (X PixMap) image stored with specific naming conventions and directory structures that allow software to look up the appropriate icon based on email address, domain name, or newsgroup name. The picons database organized thousands of these small images in a hierarchical directory structure keyed by domain name components (e.g., faces/com/example/user.xpm), enabling mail clients like exmstrstrstr and faces to automatically display a sender's photo or organizational logo alongside their messages. The system predated the modern concept of contact photos and avatars by more than a decade. One advantage is the system's pioneering role in visual identity for electronic communication: picons introduced the idea that email and Usenet messages should display a visual representation of the sender — a concept that eventually became standard in every modern email client, messaging app, and social media platform. The XPM-based format ensures that picons are displayable on any system with X Window libraries. Picon images are supported by ImageMagick, GIMP, and X Window display utilities, and the historical picons database remains archived online at Indiana University.
Developer: Steve Kinzler
Initial release: 1990

Frequently Asked Questions

Why convert RB to PICON?

RB is a dead format. PICON creates small icon-sized thumbnails — handy for file managers or visual previews of ebook content.

What displays PICON files?

ImageMagick, XnView, and Unix/Linux file managers that support XPM-style icons can display PICON personal icon files.

How large are PICON images?

PICON images are very small — typically thumbnail-sized. They capture a miniaturized version of each RB page.

Is the conversion quick?

Near-instant. PICON files are tiny, so rendering and encoding on Convertio servers takes just seconds.

Is this free?

Yes, RB to PICON conversion is free on Convertio. Paid plans provide batch conversion and higher limits.