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HTMLZ Converter

Turn any HTMLZ file into the format you need. Conversion is free, needs no signup, and your files are deleted from our servers 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 files

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. Pick the format

    Choose one of the formats your HTMLZ file converts to, then press Convert.

  3. Download your file

    Most files are ready in seconds.

What you get from the HTMLZ converter

Here you can turn HTMLZ into EPUB, MOBI, AZW3 and 2 more.

  1. 01

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

  2. 02

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

  3. 03

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

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.

Convert from HTMLZ

Convert your HTMLZ files to other formats quickly and easily. Choose a target format below to get started.

All converters

Frequently asked questions

Still have questions? Contact support.

Is it free to convert HTMLZ files?

Yes, the HTMLZ converter 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 files affect the quality?

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

Can I convert multiple HTMLZ files at once?

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

Is my data safe when converting HTMLZ files?

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 files?

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 result.

Your data, our priority

At Novitora, we convert your files and protect them. Your data is covered end to end: encrypted transfers, storage in the EU, and automatic file deletion 2 hours after upload.

Security

  • SSL/TLS encryption

    Files travel over encrypted connections and stay encrypted while they are processed.

  • Secured data centers

    Processing happens in hardened data centers with continuous monitoring.

  • Access control and authentication

    Strict access controls ensure only you can reach your files before they are automatically deleted.

  • SOC 2-aligned practices, GDPR-ready
  • Files auto-delete after 2 hours
  • Files stored in Frankfurt, EU