The tool uses the SheetJS library to read your uploaded `.xlsx` file directly in the browser. It then parses the first worksheet and converts its rows and columns into a standard CSV string, which you can then copy or download.

1. Drag and drop your `.xlsx` file onto the page, or click to upload it.
2. The tool will instantly convert the first sheet into CSV format.
3. You can then copy the resulting CSV or download it as a file.

• Extracting data from an Excel report to be used in a Python script.
• Converting a spreadsheet into a CSV for import into a database.
• Getting a plain text version of a spreadsheet for version control.

• Supports Modern Excel Files: Works with `.xlsx` and other common spreadsheet formats.
• Converts the First Sheet: Automatically extracts data from the first worksheet.
• Instant & Secure: All processing happens in your browser; your files are never uploaded.
• Easy Output: Copy the CSV to your clipboard or download it as a file.

This tool performs the reverse of a CSV-to-XLSX conversion. It takes the cellular data from a spreadsheet and 'flattens' it into a plain-text, comma-separated format, making it universally accessible to a wide range of applications and programming languages.

All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.