CSV to Excel (XLSX) Converter
Turn a CSV file into a real Excel (XLSX) spreadsheet — free, private, in your browser.
✓ Your files never leave your device. Everything runs locally in your browser.
CSV is great for exchanging data, but Excel users often want a real .xlsx workbook. This tool converts CSV into an XLSX spreadsheet with proper rows and columns.
The workbook is created entirely in your browser — your data is never uploaded.
How it works
- Paste your CSV – Paste CSV data or the contents of your file.
- Pick the delimiter – Auto-detect, or choose comma, semicolon, tab or pipe.
- Convert and download – Generate and download the .xlsx file.
Notes
Each CSV row becomes a spreadsheet row and each field a cell. Very large files are limited only by your device memory, since the conversion happens locally.
Privacy
Spreadsheets can contain sensitive data. Because everything runs in the browser, nothing is transmitted.
Frequently asked questions
Is my CSV uploaded?
No. The XLSX file is built locally in your browser.
Does it support semicolon CSVs?
Yes. Choose the delimiter, or leave it on Auto-detect.
Will numbers and dates be formatted?
Values are written as-is from the CSV, without automatic number or date formatting.
Related tools
Convert CSV to Excel now — free, private and without uploading your data.