How do I convert Excel to CSV?

Switch to "Excel → CSV" and upload your .xlsx or .xls file — the first sheet (or the one you choose, if there's more than one) converts to CSV text instantly.

Does it work with multi-sheet workbooks?

Yes — when an uploaded workbook has more than one sheet, a dropdown lets you choose which one to convert; only one sheet converts to CSV at a time, since CSV itself has no concept of multiple sheets.

Does it preserve number and date formatting?

Numbers convert as plain values. Dates are read using the format Excel stored them in; if a date looks wrong after conversion, check the original cell's format in Excel, since CSV has no native date type to round-trip it exactly.

CSV to Excel Converter Online

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Convert CSV to a real .xlsx file, or Excel to CSV — instantly, entirely in your browser.

✓ Never uploaded — processed in your browser

Paste your CSV

Never uploaded

Conversion happens entirely in your browser — your spreadsheet never touches our servers.

Real .xlsx output

CSV → Excel produces an actual Excel workbook, not a renamed CSV file.

Free, no limit

No account, and no limit on how many files you can convert.

CSV vs. Excel

CSV is a plain-text format — just rows of values separated by commas, readable by almost any tool but with no formatting, formulas, or multiple sheets. Excel's .xlsx format is a full workbook: it can hold several sheets, cell formatting, and formulas. Converting CSV to Excel gives you a real workbook to build on; converting Excel to CSV strips it down to plain data that any system can read.

How to Convert CSV to Excel Online

Choose a direction. "CSV → Excel" or "Excel → CSV."
Paste your CSV or upload your Excel file. For Excel → CSV, a multi-sheet workbook lets you pick which sheet to convert.
Convert. CSV → Excel downloads immediately as a .xlsx file; Excel → CSV shows the result to copy or download.

Frequently Asked Questions

How do I convert CSV to Excel?

Paste your CSV and click Convert & Download — a real .xlsx file downloads.

Is my spreadsheet uploaded anywhere?

No. Conversion happens entirely in your browser.

Is the CSV to Excel converter free?

Yes, with no account required and no limit on how many files you can convert.

Convert now