Free · On-device processing
Convert CSV files to Excel
Turn a comma-separated file into a proper XLSX workbook you can open, format and filter in Excel, Google Sheets or LibreOffice.
On-device processing. Document contents are processed in your browser, not sent to us. Use sample or anonymised files only.
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How it works
- Drop your CSV file onto the converter.
- Choose Excel (XLSX) as the target format.
- Click Convert.
- Download the XLSX file.
Supported formats
Input: CSV and TSV text files.
Output: An XLSX workbook.
Good to know
- CSV holds plain values only — formatting, formulas and multiple sheets don't exist in CSV, so the result is a clean single-sheet workbook.
- Free account required — no card, no trial, no watermarks added by us.
Questions
Can I go the other way?
Yes — the converter also turns Excel files into CSV, JSON, HTML and PDF.
Is my file uploaded?
No. Your file is processed entirely in your browser and is never uploaded to a server.