CSV to XLSX Converter
Export CSV values as XLSX for compatible data exchange.
Converted in your browser. Your file never leaves your device.
Drop your CSV files here
or drag and drop · 10 MB per file
How to convert CSV to XLSX
- Choose CSV files up to 10 MB.
- Use UTF-8 text with a header row; record exports need unique, nonempty column names.
- Review the report and download the XLSX file.
Where this file comes from
Database exports and spreadsheet downloads use CSV for rows separated by commas.
What changes in the conversion
XLSX opens in modern Excel and supports multiple worksheets. This tool writes cell values and sheet names without copying workbook features.
The table becomes one worksheet. Every cell is stored as text, preserving leading zeros, date text, and formula-like strings. Delimiters and quoting are replaced with spreadsheet cells. No formulas, styles, or number formats are inferred.
Size limits and browser notes
- Accepts .csv files up to 10 MB each.
- You can convert several files at once; they download together as one ZIP.
- Everything runs in your browser, so very large files depend on your device's memory.
Runs in a browser worker. Limits: 10 MB input, 100 MB expanded container, 50 worksheets, 50,000 rows, 256 columns, and 100,000 selected cells. Encrypted and damaged files are rejected. Spreadsheet styling and recalculation are not supported.
FAQ
What does CSV to XLSX keep?
XLSX opens in modern Excel and supports multiple worksheets. This tool writes cell values and sheet names without copying workbook features.
Will formula-like strings run?
No. Strings beginning with an equals sign are stored as text. This converter does not create spreadsheet formulas.
Will my file be uploaded?
No. The converter and its libraries run in your browser. File contents and names are not sent to a server.
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