Excel to CSV
Turn an .xlsx workbook into CSV files.
Excel to CSV opens an .xlsx workbook in your browser and writes each sheet out as a CSV. Pick the sheet, choose the separator, decide how dates are written, and download one sheet or all of them as a ZIP. The workbook is unzipped and parsed locally, so nothing is uploaded.
Loading Excel to CSV…
Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Excel to CSV
- Choose an .xlsx file, or drop it on the page.
- Pick the sheet, the separator and how dates should be written.
- Download that sheet, or every sheet as a ZIP.
Questions about Excel to CSV
Can it open an old .xls file?
No, and the difference matters. The .xls format is a binary Microsoft format from before 2007, not a renamed .xlsx, so nothing here can read it. Open it in Excel, LibreOffice or Google Sheets and use Save As to produce a .xlsx, then load that. The tool says this explicitly rather than failing silently.
Why do my dates come out as numbers in other converters?
Because a spreadsheet stores a date as a count of days since 1900 and only the cell format makes it look like a date. This tool reads the number formats out of the workbook, works out which cells are really dates, and writes them as text you can read. You can choose ISO (2026-03-15) or the workbook’s own display.
Which separator should I choose?
A comma is standard. Use a semicolon if the file is going into Excel on a machine set to a European locale, where a comma is the decimal separator and a comma-separated file opens as one column per row. Tab is the safest choice for pasting into another spreadsheet.
Is it safe to convert a file with salary or client data in it?
The workbook is unzipped and parsed by JavaScript in the tab, and the CSV is built there too. No copy reaches a server, so there is no retention policy to read and no breach that could expose it. Once the page has loaded you can disconnect from the network and the conversion still works.
What is not carried across?
Formulas become their last calculated value, which is what CSV can hold. Formatting, colours, merged cells, charts, images and comments are all lost, because a CSV is plain text with separators and nothing else. If you need those, keep the workbook.
Is Excel to CSV really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Excel to CSV?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.