How to Convert CSV to Excel Online
What differs between CSV/TSV and Excel, and why local in-browser conversion helps privacy.
CSV is plain-text tabular data; Excel (.xlsx) is a structured spreadsheet format.
This tool uses SheetJS in your browser to parse CSV and write .xlsx — nothing is uploaded.
Open the result in Excel, WPS, Numbers, and similar apps.
Only convert data you have the right to use. The tool does not store or share files.