Excel to CSV Converter
Excel to CSV Converter reads a real .xlsx workbook and turns its first sheet into CSV — right inside your browser. Drop in a file and the tool unzips the workbook, resolves shared strings and inline values, and produces clean delimiter-separated text you can copy or download.
Because the file is parsed locally, your spreadsheet is never uploaded. That keeps confidential exports — payroll, customers, finances — entirely on your machine.
How to use Excel to CSV Converter
- 1
Drop your .xlsx file
Drag a workbook onto the drop zone or click to browse.
- 2
Pick a delimiter
Choose comma, tab or semicolon to match where the data is going.
- 3
Copy or download
Copy the result or download a .csv/.tsv file for import.
How it reads your workbook
An .xlsx file is a ZIP archive of XML parts. The tool unzips it in the browser using the built-in decompression API, reads the first worksheet, and resolves each cell — whether it stores a shared string, an inline string, a number or a boolean — using the cell's column reference so gaps stay aligned.
The first worksheet is converted. Formulas are read as their last-calculated value, exactly as a CSV export from Excel would contain.
Private by design
Nothing is uploaded. The conversion uses your browser's own ZIP and XML capabilities, so even large or sensitive workbooks are processed locally and nothing is stored.
Choose a comma, tab or semicolon delimiter depending on the destination — comma for most imports, tab for clean pasting, semicolon for locales where the comma is a decimal separator.
Frequently asked questions
- Which sheet gets converted?
- The first worksheet in the workbook. Its rows and columns are written out as delimiter-separated text.
- Are .xls (old format) files supported?
- No. The tool reads the modern .xlsx (Office Open XML) format. Re-save older .xls files as .xlsx first.
- Is my spreadsheet uploaded anywhere?
- No. The file is unzipped and parsed entirely in your browser, so it never leaves your device.
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