How to convert CSV to XLSX
- Add your CSV file by dropping or choosing them above.
- Adjust the options if you need to.
- Click Convert to XLSX.
- Download your new XLSX file.
Why convert CSV to XLSX?
Excel files keep your columns as real cells, open with the right column widths and can be formatted, sorted and charted in Excel, Numbers or Google Sheets.
CSV vs XLSX
CSV
CSV stores table data as plain text with values separated by commas. Almost every spreadsheet, database and analytics tool can read it.
XLSX
XLSX is the modern Excel spreadsheet format. It stores worksheets, values and formatting in a compact, structured package.
Does converting affect quality?
Every row and value from your CSV is placed into worksheet cells exactly as stored.
Frequently asked questions
Are my files uploaded to a server?
No. This converter runs entirely in your browser, so your files never leave your device.
Can I convert large data files?
Yes. Any CSV up to 50 MB can be converted — that's millions of rows.
Does it keep commas inside values?
Yes. Quoted values containing commas are parsed correctly.