Online File Converter

RB Converter

Convert RB files online for free. Upload your file, choose a target format, and download the converted file when it is ready.

Or drop files here. Max file size 1GB.

Choose a file before converting.

RB format guide

What to know before converting RB

RB is the Rocket eBook format used by discontinued Rocket and REB reader devices.

What this converter actually supports

Published ebook routes use the deployed Calibre conversion runtime. Only unprotected files are supported; the service does not remove DRM or fetch missing remote book assets.

Convert RB books to EPUB for modern reader software or PDF for a fixed archive copy.

The public upload limit is 1 GB. Convertr does not reduce dimensions, duration, resolution, or output quality merely to manage worker load.

Quality and format limits

EPUB and related ebook formats are usually reflowable, while PDF and print-replica formats are fixed-layout. Moving between those models can change page breaks, fonts, navigation, and image placement.

Legacy compression, navigation, and styling may be simplified.

Published RB inputs

These links come from the active conversion catalog, not from a generic list of possible formats.

AZW to RB AZW3 to RB AZW4 to RB CB7 to RB CBC to RB CBR to RB CBZ to RB CHM to RB

Published RB outputs

Choose one of these implemented routes; a listed extension is not a promise that every codec variant will decode.

RB to AZW3 RB to DOCX RB to EPUB RB to FB2 RB to HTMLZ RB to LIT RB to LRF RB to MOBI

If a RB conversion fails

Check that the file opens in its original application, is not encrypted or DRM-protected, and really matches its extension. A damaged header, unsupported internal codec, missing linked asset, or mislabeled file can fail even when RB is generally supported. Try a different published target only when it fits your goal; changing the extension by hand does not convert the file.