HTMLZ to RB Converter

Convert HTMLZ to RB online quickly and easily. Just upload your file, convert it, and download the RB in seconds.

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What is HTMLZ ?

HTMLZ is Calibre's zipped HTML e-book: the book as one HTML file with its images and stylesheet in a ZIP archive.

HTMLZ format  ▶

What is RB ?

RB is the format of the Rocket eBook, one of the first dedicated e-readers, released by NuvoMedia in 1998.

RB format  ▶

How to convert HTMLZ to RB

  1. Upload your HTMLZ file
    Drag and drop your HTMLZ file, click 'Select Files' to upload from your device, or import directly from Dropbox, Google Drive, OneDrive, or paste a URL.
  2. Choose RB as output format
    The converter is preset to RB, but you can select any other output format before converting.
  3. Adjust settings (optional)
    If you like, tweak output options such as resolution, quality, or compression before converting.
  4. Convert the file
    Click the 'Convert' button. The conversion takes only a few seconds.
  5. Download your converted file
    Download the converted file to your device, or save it directly to Google Drive, Dropbox, or OneDrive.