CSV to Excel Converter
How to convert CSV to Excel online
- Upload a CSV file or paste CSV text into the input area on the left.
- Optionally confirm that the first row is a header row and skim the CSV preview.
- Click "Convert & Download Excel" to download an .xlsx file that opens in Excel or Google Sheets.
Privacy
All CSV-to-Excel conversion happens locally in your browser using JavaScript. Your CSV and Excel data never leave your device and are not uploaded to any server.
CSV to Excel Conversion FAQ
Is my CSV uploaded when converting to Excel?
No. This CSV to Excel converter runs entirely in your browser. Files are parsed with JavaScript and converted to XLSX locally, without sending data to any server.
Will Excel change long numbers or IDs into scientific notation?
This tool treats all CSV cell values as plain text when building the Excel file, which helps prevent Excel from auto-formatting IDs, phone numbers or ZIP codes into scientific notation.
Can I convert very large CSV files to Excel?
You can convert reasonably large CSV files, but the limit depends on your browser memory and CPU. For extremely large files, it is safer to split them into several smaller CSV files and convert them separately.
Does this tool support different delimiters or encodings?
The converter uses a standard CSV parser that can handle common separators such as commas and tabs. If your file uses a different delimiter or legacy encoding, you may need to normalize it first before converting.