Penguin CSV to Excel

Convert CSV files to Excel .xlsx format online — no signup, no upload, no limits. Drop a CSV file or paste comma-separated data, and download a ready-to-use Excel spreadsheet. Numbers are auto-detected and stored as numeric values, so formulas, sorting, and charts work correctly in Excel. Everything runs locally in your browser — your data never touches a server.

How do I convert CSV to Excel?

Drop a CSV file or paste your CSV data into the text area. Click Convert, then download the .xlsx file. The conversion happens instantly in your browser — no upload needed.

Will my formatting be preserved?

The tool converts raw CSV data to Excel cells. Numbers are auto-detected and stored as numeric values, so formulas and sorting work correctly in Excel. Column widths auto-fit to content.

Is there a file size limit?

No hard limit — it depends on your browser's available memory. Files up to 50MB typically convert without issues. Since everything runs locally, there are no server-side restrictions.

What delimiter does it support?

The tool auto-detects comma, tab, semicolon, and pipe delimiters. You can also manually select the delimiter if auto-detection doesn't match your data.