CSV to XLSX
Convert CSV to XLSX in your browser. Your file is never uploaded.
This free CSV to XLSX converter runs in your browser. Drop in a CSV file and download a XLSX a moment later, with no upload, no sign-up, and nothing to install. Because the work happens on your own device, your file never leaves it.
What is CSV?
CSV stores tabular data as comma-separated plain text. Almost every spreadsheet and database reads and writes it, which makes it the common language for moving data.
What is XLSX?
XLSX is the modern Excel workbook format. It holds multiple sheets, formulas, and formatting.
Questions
Is the CSV to XLSX converter free?
Yes, it is free with no sign-up and no watermark. There is no cap on how many files you can convert, and nothing to install.
Do my files get uploaded to a server?
No. The conversion runs entirely in your browser using code that loads onto your device, so the file is read, converted, and downloaded locally. It never reaches us or anyone else.