Online Tool Store
CSV to Excel Converter
Convert CSV data into a formatted XLSX workbook with delimiter detection, a frozen header, auto-fit columns, and an instant preview in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Input
CSV data
Spreadsheet preview
Ready — sample data is shown above.
How it works
- Choose a CSV file or paste delimited data.
- Confirm the delimiter, header, worksheet name, and column settings.
- Review the grid preview and download the generated .xlsx workbook.
FAQ
What delimiters are supported?
The converter can auto-detect comma, semicolon, tab, and pipe-separated data, or you can select the delimiter manually.
Does it preserve formulas or formatting from CSV?
CSV contains plain values only, so it has no formulas or formatting to preserve. The generated workbook adds an optional styled, frozen header and auto-fitted columns.
How large can the CSV be?
The practical limit depends on your browser memory and device. Very large files may take longer because parsing and workbook generation happen locally.
Is the CSV uploaded?
No. Reading, previewing, and XLSX generation all happen in your browser using ExcelJS.
How we compare
| Feature | Online Tool Store | Spreadsheet app | Upload converter |
|---|---|---|---|
| No install/account | ✓ | Varies | Varies |
| Local file processing | ✓ | ✓ | Often no |
| Styled frozen header | Optional | Manual | Varies |