CSV to Excel Converter — Free Online Tool
Convert CSV to Excel (XLSX) and Excel back to CSV, privately in your browser.
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Click to select a file
.csv, .xlsx, or .xls
About CSV to Excel Converter
This converter moves data between CSV and Excel (XLSX) formats in both directions, right in your browser. Turn a plain CSV into a proper Excel workbook, or pull the data out of a spreadsheet into a clean CSV file.
It uses the SheetJS library locally, so your spreadsheets are never uploaded. It's ideal for quick data hand-offs between tools and teammates.
How to Use CSV to Excel Converter
- Click to select a .csv, .xlsx, or .xls file.
- Click Convert to Excel (for CSV) or Convert to CSV (for Excel).
- The converted file downloads automatically.
Key Features
CSV to XLSX and XLSX/XLS to CSV
Powered by SheetJS, runs in your browser
Preserves cell values
No uploads — fully private
Free, no signup
Frequently Asked Questions
How do I convert CSV to Excel?
Upload your .csv file and click Convert to Excel. The tool builds an .xlsx workbook in your browser and downloads it.
Can I convert Excel back to CSV?
Yes. Upload an .xlsx or .xls file and click Convert to CSV. The first sheet is exported as a CSV file.
Are my spreadsheets uploaded to a server?
No. The conversion uses the SheetJS library entirely in your browser, so your files never leave your device.
Does it keep my data formatting?
Cell values are preserved. Complex Excel features like formulas, charts, and styles are simplified when converting to CSV, since CSV holds plain values only.