HTMLZ to XZ Converter
Processing entirely on your device — large files may take a moment.
HTMLZ is Calibre's zipped-HTML ebook format: the web page plus its images in one portable archive — a "web-to-ebook" snapshot. Unpack XZ into ZIP/TAR for tools that cannot read LZMA2.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How to convert HTMLZ to XZ
- 1
Select your files
Select your HTMLZ file.
- 2
Convert instantly
The file bytes are gzip-compressed in place — the same archive your server or build tool produces, made locally.
- 3
Download results
Download the .gz file — ready to upload, serve or attach.
About the HTMLZ format
HTMLZ is Calibre's answer to "save the whole page": the HTML document, its images and its stylesheet zipped into one file. It is a web snapshot that e-reader pipelines can treat as a book — a format born from the era of clipping articles for offline reading.
The archive opens in the browser, the main HTML feeds the chapter pipeline, and text or EPUB comes out with images dropped or embedded depending on the target.
+Strengths
- ✓Complete page snapshot in one file
- ✓Calibre-native round-trip
- ✓Easy to inspect (it is just a zip)
!Limitations
- −No reader displays it directly
- −Styles rarely survive conversion
- −Multi-file URLs can break image paths
About the XZ format
XZ wraps the LZMA2 algorithm: the best ratio of the common Unix compressors, which is why distribution packages and source releases pick it when bandwidth matters more than CPU.
Windows Explorer and many cross-platform tools cannot open it — unpacking to ZIP or TAR makes the payload portable.
+Strengths
- ✓Highest common ratio
- ✓Standard for Linux packages
- ✓Integrity checks built in
!Limitations
- −Memory-hungry at high settings
- −Sparse support outside Linux
Why convert HTMLZ to XZ?
There is a concrete reason this conversion exists: No reader displays it directly XZ sidesteps that — Highest common ratio If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this HTMLZ to XZ converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for HTMLZ to XZ?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Is there a size limit for archive conversion?
There is no upload cap because nothing is uploaded — the practical limit is your device memory. A few hundred megabytes of unpacked content works comfortably on a modern computer.
What about folders and directory structure?
The full directory tree is preserved: folders stay folders, and deep paths arrive exactly as they were packed in the HTMLZ file.