To convert RB to AZW3, select or drop your .rb file above, check that AZW3 is chosen as the output, and click Convert. This conversion runs on our server, and your files are deleted 72 hours later.
What is an RB file?
RB – Rocket e-book. RB is the e-book format of the Rocket eBook, one of the first e-readers (1998).
RB Converter →What is an AZW3 file?
AZW3 – Kindle e-book (AZW3, KF8). AZW3 (also called KF8) is the Kindle e-book format that replaced MOBI. It supports modern layout and fonts.
AZW3 Converter →How to convert RB to AZW3
- Click Select File, or drop your .rb files anywhere on this page. You can add several at once.
- Check that AZW3 is chosen as the output format. On this page it is picked for you.
- Click Convert. When a file has to go to our server, the button says Upload and convert instead.
- Click Download next to each file when it's done.
RB vs AZW3: how they compare
| RB | AZW3 | |
|---|---|---|
| Layout | Flowing text | Flowing text |
| Editable | No | With e-book tools |
| Created by | NuvoMedia, 1998 | Amazon, 2011 |
| Best for | Rocket eBook readers | Kindle e-readers |
Good to know
- The RB e-book is converted by calibre. Copy-protected (DRM) e-books cannot be converted: ConvertKitty does not remove DRM, so use books you have bought without it or that are free of it.
- The AZW3 e-book is made by calibre from the text, headings and pictures of the RB file; a cover is not created.
Frequently asked questions
Is converting RB to AZW3 free?
Yes. Everyone gets 25 free credits a day, with no account needed. Conversions on our server use one credit per started minute of work, so most cost a single credit. Credits reset at midnight UTC.
Are my RB files uploaded anywhere?
This conversion runs on our server, because reading an RB file needs calibre, which does not run in a browser. Your file is sent over an encrypted connection, and both it and the result are deleted 72 hours after the conversion. The server has no internet access while it works on your file.
How large can the RB file be?
Up to 1 GB per file. This conversion runs on our server, which accepts files up to that size.
Will the AZW3 look the same as the RB?
The text, chapters and pictures are kept. The look can differ: AZW3 readers use their own fonts and page sizes, so page breaks move.
Can I convert several RB files at once?
Yes. Add as many files as you like; they are converted one after another, and each one gets its own Download button.
How long does converting RB to AZW3 take?
In our tests a 4 MB novel of 400 chapters took about 44 seconds to become an AZW3 file. Most books are far smaller and take a few seconds.
Convert RB to other formats
- RB Converter
- RB to EPUB Converter
- RB to LRF Converter
- RB to MOBI Converter
- RB to OEB Converter
- RB to PDB Converter
- RB to PDF Converter
- RB to RTF Converter
- RB to TXT Converter
Convert other files to AZW3
- Convert to AZW3
- DOCX to AZW3 Converter
- PDF to AZW3 Converter
- EPUB to AZW3 Converter
- MOBI to AZW3 Converter
- ODT to AZW3 Converter
- RTF to AZW3 Converter
- TXT to AZW3 Converter
- HTML to AZW3 Converter
- CBZ to AZW3 Converter
- FB2 to AZW3 Converter
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