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Convert HTMLZ to MOBI

Convert HTMLZ to MOBI online for free. No signup required. Your files upload over an encrypted connection and are deleted after 2 hours.

  • Free

    no account needed

  • Frankfurt

    stored in the EU

  • 2 hours

    then files are deleted

New conversion

Any format in, the right format out

Drag and drop your files here, or import from:

Upload files up to 100 MB in HTMLZ

How to convert HTMLZ to MOBI

Everything happens on this page, in any modern browser, with nothing to install.

  1. Upload your HTMLZ file

    Drag and drop your HTMLZ file or browse from your device, Google Drive, Dropbox, or OneDrive.

  2. Convert to MOBI

    Press Convert. To convert several HTMLZ files at once, add them all first.

  3. Download your MOBI

    Most files are ready in seconds.

What you get when you convert HTMLZ to MOBI

Each HTMLZ file you add comes back as its own download, under its original name.

  1. 01

    With several results, Download all saves them all with one click.

  2. 02

    If one file in a batch fails, the others still finish, and the result says what went wrong.

  3. 03

    Your MOBI file converts on to EPUB, AZW3, FB2 and 6 more here.

What HTMLZ and MOBI files are

HTMLZ

HTMLZ is an ebook format made by the Calibre ebook manager: a ZIP file holding the book as one HTML page with its CSS, images and metadata. Unzipped, it opens in a web browser and is easy to edit, but Kindle and Kobo e-readers do not support it, so it is best converted to EPUB for reading on a device.

MOBI

MOBI is an ebook format originally developed for Mobipocket Reader and later adopted by Amazon Kindle. It supports basic formatting, images, and DRM protection for digital book distribution.

Convert your HTMLZ files to other formats

Choose a target format below to convert your HTMLZ files quickly and easily.

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Convert other files to MOBI

Select a source format below to convert files to MOBI.

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Frequently asked questions

Still have questions? Contact support.

Is it free to convert HTMLZ to MOBI?

Yes, converting HTMLZ to MOBI is completely free. You can convert files up to 100 MB and up to 10 files per batch, and no signup or account is required.

Will converting HTMLZ to MOBI affect the quality?

Our converter preserves the original quality of your HTMLZ files during the conversion to MOBI. The output maintains formatting, layout, and visual fidelity as closely as possible.

Can I convert multiple HTMLZ files to MOBI at once?

Yes. You can convert up to 10 HTMLZ files to MOBI in a single batch. Drag and drop all the files at once, and Novitora processes them together.

Is my data safe when converting HTMLZ to MOBI?

Your files upload to Novitora servers over an encrypted TLS connection and are automatically deleted 2 hours after upload. Data is stored in the EU (Frankfurt), and we follow SOC 2-aligned security practices.

What devices can I use to convert HTMLZ to MOBI?

Novitora works in any modern web browser on desktops, laptops, tablets, and phones. There is nothing to install: open the page, upload your HTMLZ file, and download the MOBI.