HTMLZ vs FB2 — Comparison & Free Converter
Fast, instant HTMLZ to FB2 conversion. No signup required. Just drop your .htmlz file and get .fb2 in seconds.
Batch Settings
About HTMLZ to FB2 Conversion
HTMLZ or FB2 — which format should you use? The answer depends on your needs. Here's a quick breakdown.
HTMLZ is a widely used file format. It has common platform support. FB2 (FictionBook) is an XML-based e-book format popular in Russia and Eastern Europe. It has niche platform support.
So when should you convert HTMLZ to FB2? This conversion is ideal when you When you need a FB2 file. This conversion helps you convert between formats quickly.
Converting HTMLZ to FB2 maintains high quality with CocoConvert's optimised encoder settings.
If you've decided FB2 is the right choice, CocoConvert makes the conversion effortless. Upload your .htmlz file, pick FB2, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert HTMLZ to FB2
- 1
Choose your HTMLZ file
Upload your .htmlz file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to FB2
Select .fb2 from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large ebook files.
- 4
Get your FB2 file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert HTMLZ to FB2
Your HTMLZ file is decoded and re-encoded as FB2.
Your HTMLZ file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in FB2 format
The converted file is ready for download
Format Comparison
HTMLZ
.htmlz file
| Extension | .htmlz |
| MIME Type | application/zip |
| Category | eBook |
FB2
.fb2 file
| Extension | .fb2 |
| MIME Type | application/x-fictionbook+xml |
| Category | eBook |
Should You Convert HTMLZ to FB2?
When to Convert
- ✓When you need a FB2 file
Frequently Asked Questions
Should I use HTMLZ or FB2?
It depends on your goal. HTMLZ preserves full quality. FB2 preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is FB2 higher quality than HTMLZ?
Not necessarily. Converting HTMLZ to FB2 maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert HTMLZ to FB2 on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for HTMLZ to FB2?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for HTMLZ to FB2?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.