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Convert MOBI to RB

Convert MOBI files to RB online – Reflowable e-book with table of contents, title and author.

or drag them here, or paste with Ctrl+V / ⌘V

Documents and e-books (DOCX, DOC, DOCM, DOTX, DOT, ODT, RTF, TXT, ABW, ZABW, PAGES, HWP, HWPX, LWP, SDW, WPD, WPS, XLSX, XLS, XLSM, XLTX, XLT, ODS, OTS, FODS, CSV, TSV, DIF, SLK, NUMBERS, ET, SDC, HTML, MD, RST, TEX, PDF, XPS, DJVU, EPUB, MOBI, AZW3, FB2, LRF, PDB, AZW, PRC, LIT, HTMLZ, TXTZ, PMLZ, RB, TCR, CHM, CBZ, CBR, CB7) · up to 10 files at once

Conversion options

PDF pages

Leave empty for all, or type e.g. 1-3, 5, 8-

Resolution
PDF document
Page size
Images per page
Image resolution in the PDF
Image
Icon sizes (px)
Video

Lower resolutions reduce file size. The video will not be enlarged.

Audio
Bitrate

Higher means better sound and a larger file. “Auto” keeps the bitrate of the original (at least 128 kbit/s); from lossless files it uses the format’s high-quality setting.

Sample rate
Channels
Cut (optional)

Times such as 1:30 or 0:45.5. Leave empty to keep the whole recording.

Picture

The video shows this picture for the whole length of the sound – for example to upload music or a podcast to YouTube.

Video size
Document
Resolution
Pages to convert

Several pages arrive as a ZIP with one image per page.

Shown by e-readers in the library; leave empty to keep what the document says.

PDF/A-2b embeds all fonts so the file looks the same in many years; required by many courts and public offices.

Scales every sheet so it fits on a single page instead of being split across several.

Sheets

CSV and TSV hold one table: with “Every sheet” each sheet becomes its own file, together in a ZIP.

Separator

Excel in many European languages expects a semicolon; most other programs a comma.

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 7 days so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Documents and e-books are uploaded only after you accept and are converted on our server. The input is deleted after processing; results are kept for 7 days. Privacy details

How to use: MOBI to RB

  1. 1 Click “Choose files” or drop your MOBI file onto the page (up to 10 at once).
  2. 2 RB is already selected; under “Options” you can set the book’s title and author.
  3. 3 Click “Convert” and confirm the upload: documents are converted on our server.
  4. 4 Follow the upload, the place in the queue and the progress – you can keep browsing meanwhile.
  5. 5 Download the RB file when it is ready; it stays available for 7 days unless you delete it.

About this tool

MOBI is the older Kindle and Mobipocket e-book format. RB is the format of the Rocket eBook and REB1100 readers.

This converter turns your MOBI file into RB, the right choice for Rocket eBook readers. The text reflows on every screen size, with a table of contents from the headings. You can set the book’s title and author under “Options”. Add up to 10 files at once – each one is converted in the background, so you can keep using the site and download every result as soon as it is ready.

Documents are converted on our server: the upload starts only after you confirm, the original is deleted after conversion and the result is kept for 7 days unless you delete it sooner.

Frequently asked questions

How do I convert MOBI to RB?

Choose or drop your MOBI file, keep RB as the output and click Convert. After you confirm the upload, our server converts the document and shows the progress; then you download the RB file.

Can I convert several MOBI files at once?

Yes. Add up to 10 files at a time. Each gets its own background job with its own progress, and you can download each result as soon as it is finished.

How large can the file be?

Each file can be up to 100 MB.

What happens to my file?

It is uploaded only after you confirm. The original is deleted as soon as the conversion is finished, and the RB file is kept for 7 days so you can download it – you can delete it yourself at any time.

Is the MOBI to RB converter free?

Yes. It is free, without sign-up and without a watermark.

Will the e-book work on my reader?

Yes – the RB file follows the format’s standard. The text reflows on any screen, and the headings become the table of contents. Set the title and author under “Options” so the book is easy to find in your library.

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