AnyFormat

00 XLSX → CSV

XLSX to CSV

Drop a workbook. Formulas become their computed values.

Drop files or a folder here

or choose from your device · paste with ⌘V / Ctrl+V

.xlsx .xlsm .xls

03Options 7

All-sheets produces an object keyed by sheet name rather than a flat list.

Off omits the key entirely when a cell is blank, rather than writing an empty string.

Flattening turns {"address":{"city":"Oslo"}} into an address.city column.

  • No upload The conversion runs in this tab. Your file never travels — not to us, and not to the advertising.
  • No sign-up, no email, no daily cap There is no account system to sign up to.
  • No size limit we invented Only your device's memory — about ~2 GB on a desktop browser, ~400 MB on a phone.
  • Turn your Wi-Fi off and convert anyway The conversion needs nothing but this page. Ads will not load without a connection; your file will still convert. That is the whole claim, and it takes five seconds to check.

Drop an .xlsx file to get CSV. This is the conversion people most often cannot legally do on an upload-based site, because the workbook is a customer list, a payroll export or a financial model.

Formulas, formatting and everything else CSV cannot hold

CSV holds values and nothing else. Formulas become their last computed result as stored in the file — which means a workbook that was saved without recalculating gives you stale values, and one saved by a tool that never calculated at all may give you empty cells. Excel stores both the formula and its cached result; only the result can survive.

Also lost: cell formatting, colours, merged cells (the value stays with the top-left cell and the rest come through empty), charts, pivot tables, comments, data validation and conditional formatting. Multiple sheets need the option below.

Workbooks with several sheets

Only the first sheet is converted by default, and you are told the names of the ones that were skipped rather than left to wonder. Switching Sheets to All sheets produces a structure keyed by sheet name — useful for JSON output, less so for CSV, which is inherently one table.

Dates

Excel stores dates as numbers counting days from 1900 (or 1904 on some Mac-authored files), with formatting deciding how they display. Dates are recognised and written as ISO 8601 (2026-08-16), which sorts correctly as text and is unambiguous — unlike the 03/04/2026 that Excel would show, which means two different days depending on which side of the Atlantic you are on.

Other names for this

Also searched as “excel to csv”, “xlsx to csv converter”, “convert excel file to csv”.

Questions

My formulas came out as values.
That is the only option — CSV has no formula syntax. The value written is the result Excel last cached in the file.
The workbook has several sheets and I only got one.
Only the first is converted by default, and the tool names the ones it skipped. Convert the file once per sheet, or use “All sheets” with JSON output.
Can it open .xls as well?
Yes — the legacy binary format is supported too. There is a dedicated XLS to CSV page with the specifics.
The file is password-protected.
Encrypted workbooks cannot be read without the key. Open it in Excel, enter the password, and re-save it without one.
Is my data uploaded anywhere?
No. The conversion runs as JavaScript inside this tab. Open your browser's Network panel and convert something — you will see no request carrying your data, because there is no server to send it to. You can also turn your Wi-Fi off and convert anyway.
How large a file can I convert?
There is no imposed limit — the ceiling is your device's memory. In our testing a desktop browser handles files up to about 2 GB and a phone up to about 400 MB before the tab runs out of memory. Files above a few hundred megabytes are noticeably slower because everything is held in RAM at once.