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CSV First Aid

CSV to Excel (XLSX)

CSV in, .xlsx out. Encoding is detected from the bytes, special characters survive the round-trip, column widths auto-fit. Opens the same in Excel, Google Sheets, and Numbers.

Drop your CSV file here

or click to browse

Detects encoding and delimiter automatically.

How it works

  1. 1Drop your CSV file above. It stays in your browser — nothing is uploaded.
  2. 2CSV First Aid detects encoding and delimiter, parses all rows, and generates an Excel workbook.
  3. 3Download the .xlsx file and open it in Excel, Google Sheets, or Numbers.

FAQ

Will my special characters display correctly?

Yes. We detect the file's encoding (UTF-8, Windows-1252, etc.) and convert to Unicode before creating the Excel file.

Does it support large files?

200 000 rows process without freezing the tab. The heavy lifting runs off the main thread — you can keep scrolling while it works.