CSV to XLSX Converter
Convert CSV files to XLSX free — instantly, with no sign-up, no watermark and no upload.
Zero server uploads. The CSV to XLSX conversion happens inside your browser, so your file never leaves your device and nothing is stored by us.
Drop your CSV file here
or click to browse — accepts .csv
Instant and free
No account, no watermark and no file size limit — as fast as your device allows.
Completely private
Everything runs in your browser, so your files are never uploaded anywhere.
Works everywhere
Chrome, Edge, Safari and Firefox on Windows, macOS, Linux, Android and iOS.
Why convert CSV to XLSX?
CSV is raw comma-separated data with no formatting, formulas or column widths. Converting to XLSX gives you a real Excel workbook you can sort, filter, chart and format.
Are my CSV files uploaded anywhere?
No. The conversion runs inside your browser using your own device's processing power, so the file never leaves your computer or phone and nothing is stored on a server.
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