Download and install the latest version of Filestar.
Right click on one or more Xlsx file(s) on your desktop and select Convert with Filestar.
Type reduce file size in the search box.
Press Run.
Or let an AI agent do it: filestarcli -i file.xlsx -c "reduce file size" (how).
Let your AI agent reduce XLSX file size
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Use Filestar to reduce XLSX file size in my Downloads folder”
Or run it yourself:
filestarcli -i file.xlsx -c "reduce file size"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent reduce XLSX file size?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.xlsx -c "reduce file size" on your computer, so your files stay on it.
An XLSX file is an Excel spreadsheet created by Microsoft Excel or another spreadsheet program, such as OpenOffice Calc or Apple Numbers. It stores data in worksheets, which contain cells arranged in a grid of rows and columns, and may also contain charts, mathematical functions, styles, and formatting. XLSX files are commonly used to store financial data and to create simple or complex mathematical models.
