How to use CSV to Excel
- Choose or drop a .csv file, or paste CSV text.
- Check the detected delimiter and preview.
- Choose whether the first row is a header (it will be bold and frozen).
- Click “Convert” and download the .xlsx.
Supported formats
| Input | CSV, TSV, TXT |
|---|---|
| Output | XLSX |
| Processing | On your device, in the browser (no upload) |
Limitations to know
- Dates are kept as text exactly as written, because date formats differ between countries (e.g. 03/04 could be March 4 or 3 April).
- Excel’s limit of 1,048,576 rows per sheet applies; larger files are rejected with a message.
Privacy: CSV to Excel runs entirely in your web browser. Your CSV/TSV/TXT data is not uploaded, stored or shared, and nothing about its contents is sent to analytics.
Frequently asked questions
Why does Excel break my CSV when I open it directly?
Excel guesses formats when opening CSVs: it can strip leading zeros, turn long IDs into scientific notation and misread delimiters in some regions. Converting to .xlsx first avoids those guesses.
Will special characters (é, ü, 中文) display correctly?
Yes. The tool reads UTF-8 text and writes a modern .xlsx file, which stores Unicode correctly.
References
Last updated · Maintained by the ZippyToolkit team