Free tool
Convert CSV to Excel (.xlsx).
Drop a CSV and download a genuine Excel workbook — not a renamed CSV. Useful when a system requires .xlsx or when you want Excel to stop reformatting your data on open.
Everything runs in your browser. Nothing is uploaded.
Drop a CSV or Excel file here
Or choose a file — nothing leaves your browser.
Common questions
Is this a real Excel file?
Yes — a genuine .xlsx workbook, so Excel opens it without the 'file format doesn't match' warning you get from renaming a CSV.
Will Excel still mangle my data on open?
Values are written as text, which prevents the classic problems where leading zeros vanish or codes turn into dates.
Is my file uploaded anywhere?
No. The file is parsed and processed entirely in your browser using JavaScript. It never leaves your device, and nothing is stored on our servers.
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