RB Converter
Convert files to and from RB online for free. Fast, secure, and high-quality file conversion with no sign-up or software required.
Maximum file size is 1GB
Like RunConvert? Set us as a preferred source on Google.
Add to Preferred SourcesHow it works
Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.
What is an RB file?
The RB file format is a proprietary eBook container developed by Nuvo Media for the Rocket eBook, a pioneering dedicated e-reader device released in 1998. The format encapsulates HTML-based content and raster images within a binary structure, often employing a proprietary DRM (Digital Rights Management) encryption scheme. It relies on a pseudo-HTML markup designed specifically for rendering on the monochrome low-resolution displays of early handheld devices.
How to open an RB file
Native support for RB files is absent in modern Windows, macOS, and Linux kernels. Users must utilize specialized eBook management software to parse the legacy binary structure. Calibre is the primary open-source utility recommended for decoding RB containers and converting them to modern standards like EPUB. Alternatively, the legacy RocketLibrarian application can be used in emulated environments.
rb Technical Info
- Full Name
- Rocket eBook File
- Developed By
- Nuvo Media
- Initial Release
- 1998
- MIME Type
- application/x-rocket-ebook
More tools
Related conversions
Why RunConvert
The fastest way to convert any file
Purpose-built for speed, privacy, and breadth of format support.
3,000+ conversions supported
Every popular and niche format covered - video, audio, image, document, archive and more. New formats added regularly.
Fast, cloud-powered
No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
Secure & private
Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
Free - no account needed
Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.