Download and install the latest version of Filestar.
Right click on one or more Htmlz file(s) on your desktop and select Convert with Filestar.
Type convert to fb2 in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.htmlz -c "convert to fb2" (how).
Documents - File Explorer─☐✕
This PC › Documents
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.htmlzContract.htmlz
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert HTMLZ to FB2
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine. It works on Windows, macOS only.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the HTMLZ files in my Downloads folder to FB2”
Or run it yourself:
filestarcli -i file.htmlz -c "convert to fb2"
Runs on your computer, so your files stay on it. Works on Windows and macOS. 50 free conversions with the npm install, no account needed.
Can my AI agent convert HTMLZ to FB2?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.htmlz -c "convert to fb2" on your computer, so your files stay on it.
It is an eBook file that contains multiple files, such as .HTML files, metadata .OPF files, and images saved in a .ZIP archive file. The main purpose of HTLMZ is to package all eBook content in one file.
The FB2 (FictionBook 2.0 File) format is an open XML-based ebook format specifically designed for fictional literature, although it can also accommodate non-fiction. Unlike other ebook formats, FB2 focuses on the structure and content of the book, rather than its appearance. This means that the layout, font, and styling are determined by the e-reader device or software, offering a more uniform reading experience across different platforms.
