CSV to Excel Converter (and Excel to CSV)

Convert CSV to Excel (.xlsx) with real numbers, or Excel to CSV, in your browser. Commas, semicolons and tabs detected. Free, nothing uploaded.

Runs in your browser. Your files are never uploaded. How it works

CSV to Excel converts a CSV file into a real Excel workbook (.xlsx), and an Excel sheet back into CSV. The separator (comma, semicolon, tab) and the text encoding are detected, numbers become numbers you can calculate with, and codes with leading zeros stay as text. Everything runs in your browser.

How to convert

  1. Drop a CSV (to get Excel) or an .xlsx file (to get CSV) on the page.
  2. Check the preview of the first rows.
  3. Click Download Excel or Download CSV. For a workbook with several sheets, pick the sheet first.

What is handled for you

Problem with opening a CSV directly Here
Everything in one column (semicolon files) Separator detected
Accents shown as é UTF-8 and Windows encodings detected
007 becomes 7 Codes stay text
1,234.50 stored as text Stored as a number

Private by design

Your files are processed on your own device and never uploaded. See how it works.

Frequently asked questions

Is my file uploaded?

No. The file is opened in your browser, on your device, and never sent anywhere.

Why not just open the CSV in Excel?

Excel often splits CSV files wrongly (semicolons, other languages), drops leading zeros or garbles accents. Here the separator and encoding are detected, numbers become real numbers and codes like 007 stay text.

Which Excel files can be converted to CSV?

.xlsx files from Excel, Google Sheets, LibreOffice and Numbers. Old .xls files are not supported: save them as .xlsx first.

My Excel uses semicolons in CSV. Is that supported?

Yes. Semicolon CSV files are detected (with comma decimals like 1.234,50), and you can save CSV with semicolons for European Excel.

What happens to dates and formulas?

Excel to CSV writes dates as YYYY-MM-DD and formulas as their last calculated value.

More ways to use CSV to Excel

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