CSV to Excel (XLSX) Converter
Convert CSV to Excel (.xlsx) free in your browser. No upload, no email required — drop a CSV and download a real Excel workbook.
- 100% free
- Runs in your browser — nothing is uploaded
- No signup required
Sometimes a plain CSV isn't enough — a colleague wants a “real” Excel file, or a system only accepts .xlsx. This tool converts any CSV into a genuine Excel workbook without opening Excel at all.
Unlike opening a CSV directly in Excel (which can silently mangle dates, leading zeros, and long numbers), this conversion keeps every cell exactly as text appears in your CSV. The file is generated locally in your browser.
Example
name,age Ada,36
converted.xlsx — an Excel workbook with one sheet, 2 rows
Your data never leaves your device
Like everything at OpenCSV, this tool processes files locally in your browser. There is no upload, no server-side processing, and no copy of your data anywhere — which makes it safe for customer lists, financial exports, and other sensitive files.
Frequently Asked Questions
- No. The .xlsx file is generated entirely in your browser and works in Excel, Google Sheets, LibreOffice, and Numbers.
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Need to view or edit the file first?
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