Add an Excel workbook. Each sheet with data becomes its own CSV file, made on your device.
Sheets
Delimiter
More options
Adds ' before values starting with = + - or @, so spreadsheets don't run them.
Helps Excel show accented letters when it opens the CSV.
Your files will appear here.
What it does
Excel to CSV turns each sheet of an Excel workbook into a CSV file another program, a database or an import screen can read.
Sheets: All sheets gives one CSV per sheet with data. First sheet gives only the first visible sheet that has data.
Delimiter: Comma, Semicolon or Tab between values. Values that hold the delimiter, a double quote or a line break are put in double quotes, as CSV readers expect.
Values as stored: numbers without their formatting (25% is 0.25), dates as 2026-01-31, and each formula’s last calculated value.
Protect against formulas, under More options and on by default, adds ' before text starting with =, +, -, @, a tab or a carriage return, so a spreadsheet that opens the CSV doesn’t run it as a formula. Numbers, such as -5, are never changed.
Add a UTF-8 BOM for Excel, under More options, helps Excel show accented letters.
Every line ends with a Windows line break (CRLF), which Excel and most import tools read.
How to use it
Drop your workbooks on the box, paste them, or select Choose files. Select “Try a sample” to see a two-sheet example.
Check the options. Each file shows how many sheets and rows it gave, such as “2 sheets · 12 rows”.
Select Download CSV for one file, or Download all to save every CSV in one ZIP file.
Press Esc to stop a conversion that’s still working.
Good to know
You can add up to 20 workbooks at a time, each up to 10 MB.
A workbook can unpack to up to 100 MB of workbook data and hold up to 10,000,000 cells, counted from A1 to its last value, and its CSV files can hold up to 100,000,000 characters together.
Hidden sheets aren’t converted. To convert one, unhide it in your spreadsheet app first.
Formatting, colours, comments, pictures and charts aren’t part of a CSV, so they’re left out.
Privacy
Your workbooks are processed on your device: the tool runs in your browser, and your files aren’t uploaded.
Advertisements
Frequently asked questions
What happens to a workbook with several sheets?
Each sheet with data becomes its own CSV file, named after the workbook and the sheet, such as `orders-Sales.csv`, and Download all saves them in one ZIP file. A workbook with one sheet of data gives `orders.csv`. Choose First sheet to convert only the first visible sheet that has data. Empty sheets, chart sheets and hidden sheets are skipped, and the line under the file says how many hidden sheets were left out.
Why do some values look different from Excel?
A CSV holds each value as it is stored, not as Excel formats it on screen. A cell showing 25% is stored as `0.25`, and £1,234.50 as `1234.5`. Numbers keep up to 15 significant digits, as Excel does, and TRUE and FALSE stay `TRUE` and `FALSE`. A cell with a formula gives its last calculated value, never the formula itself. Merged cells keep their value in the top-left cell only, which is where Excel stores it.
How are dates written?
A cell formatted as a date is written as `2026-01-31`, a date with a time as `2026-01-31 14:30:00`, and a time alone as `14:30:00`, rounded to the second. These forms read the same in every country and most programs import them. A number with an elapsed-time format, such as `[h]:mm`, stays a number.
Can it convert .xls files?
No. It reads the `.xlsx` and `.xlsm` workbooks Excel has saved by default since 2007. Open an older `.xls` file in Excel or another spreadsheet app and save it as an Excel Workbook (`.xlsx`) first. OpenDocument (`.ods`) and binary (`.xlsb`) workbooks are refused too, and so are workbooks protected with a password to open.
My CSV opens in Excel in one column or with odd letters. What can I do?
Where the comma is the decimal separator, as in Germany, France or Brazil, Excel expects semicolons between values, so choose Semicolon under Delimiter. If accented letters such as é show as two odd characters when Excel opens the CSV, turn on Add a UTF-8 BOM for Excel under More options: it tells Excel the file is UTF-8.
Are my files uploaded?
No. Your workbooks are converted by your browser, on your device, and your files aren’t uploaded. The CSV files are made on your device too, and they’re saved only when you select Download.