Convert 123 to html

Download and install the latest version of Filestar.
Right click on one or more 123 file(s) on your desktop and select Convert with Filestar.
Type convert to html in the search box.
Press Convert.

Or let an AI agent do it: filestarcli -i file.123 -c "convert to html" (how).

Let your AI agent convert 123 to HTML

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

Or add it in one click:

Claude Code:

claude mcp add filestar -- npx -y [email protected] mcp

Then ask your agent:

“Convert the 123 files in my Downloads folder to HTML”

Or run it yourself:

filestarcli -i file.123 -c "convert to html"

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 123 to HTML?

Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.123 -c "convert to html" on your computer, so your files stay on it.

Using Filestar With AI Agents → · Download SKILL.md

What is the difference between .123 and .html?

Name: Lotus 1-2-3 Spreadsheet; Hypertext Markup Language File
Extension: .123; .html
Format: Binary; Text
Category: Spreadsheet; Developer
Developer: IBM; World Wide Web Consortium (W3C)
Description: The 123 file format is a proprietary file format developed by the Lotus Development Corporation for use with its Lotus 1-2-3 spreadsheet software. It is a binary file format, which means that it stores data in a binary format that is not easily readable by humans.; An HTML file is a webpage coded in HTML that can be displayed in a web browser. It is used to format text, tables, images, and other content that is displayed on a webpage. HTML files are widely used on the web as most pages within static websites have an ".html" extension.
MIME Type: application/vnd.lotus-1-2-3; text/html
Sample: sample.123; sample.html
Wikipedia: .123 on Wikipedia; .html on Wikipedia

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