Fix CSV encoding — repair garbled characters and convert CSV to Excel

When a CSV shows garbled characters in Excel, this detects the file's encoding (UTF-8, Windows-1252, Shift_JIS, EUC-KR and more) and saves a CSV or Excel file (XLSX) that opens correctly. It converts Excel to CSV too.

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Drop a CSV with broken characters, or an Excel file

Choose file

CSV · TSV · TXT · XLSX

Why characters break

A CSV doesn't record its text encoding. When a UTF-8 export is opened as another encoding — or the other way round — accented letters and non-Latin text turn into symbols.

This tool detects the encoding from the content and re-saves the data as UTF-8 with BOM, which Excel always recognises, or as XLSX.

Check the preview

Look at the table preview before saving. If it still looks wrong, pick an encoding manually and the preview updates.

Frequently asked questions

Will leading zeros be kept?

In XLSX, numbers starting with 0 (phone numbers, ZIP codes) and very long numbers are stored as text so they stay intact.

Is it safe for customer data?

Yes. The file is read and converted in your browser and never uploaded.

Which Excel sheet is converted?

The first sheet.