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MyDataFixer

Excel to CSV Converter

Choose a worksheet from an XLSX or XLS workbook, preview it and download it as CSV, or download every sheet at once as a ZIP of CSV files.

Open an Excel workbook to save a sheet, or every sheet, as CSV. Everything happens on your device: the file is not uploaded and is never changed.

Your file is read by your browser on this device. It is not uploaded to our servers.

How the Excel to CSV converter works

  1. Open an Excel workbook (.xlsx or .xls). It is read on your device, and the first sheet is shown.
  2. Choose a sheet from the list. Hidden sheets are marked; chart sheets have no cells to convert.
  3. Choose how values are written: “As shown in Excel” (dates and numbers formatted as on screen, such as 13/11/2026 or 1,250.00) or “Plain values (for databases)” (dates as 2026-11-13, numbers in full precision without formatting, TRUE/FALSE as words).
  4. Choose the separator (comma, semicolon or tab), line endings (CRLF or LF) and UTF-8 with or without BOM.
  5. Download this sheet as CSV, or every sheet at once as a ZIP file with one CSV per sheet. Every file is checked cell by cell before it is offered.

Example

A workbook has a “Data” sheet with amounts formatted as 1,234.57 and dates shown as 2024-01-31, plus a hidden “Archive” sheet. For a colleague, “As shown in Excel” gives Ann,10.50,2024-01-31. For a database import, “Plain values” with a semicolon and no BOM gives Ann;10.5;2024-01-31;TRUE. “All sheets (ZIP)” creates Data.csv and Archive.csv, with Archive marked as hidden in the summary.

What the converter never does

  • Upload your workbook or change it.
  • Leave out rows or columns that are hidden in Excel: a CSV file can't hide them, so they are included and listed in the summary.
  • Run formulas: the value each formula last showed in Excel is saved.

Good to know

  • A CSV file holds values only: formatting, formulas, charts, images, comments and other sheets can't be kept, and the summary lists what this workbook had. A merged cell's value is written once, in its first cell.
  • Large workbooks need more memory than CSV files of the same size; on phones, very large workbooks may be refused before work starts, with a message.
  • Password-protected workbooks can't be opened.

Questions and answers

Is my file uploaded?

No. Your browser opens the file on your device and every check, fix and download happens there. The contents of your file are not sent to MyDataFixer's servers or to anyone else, and your original file is never changed.

Can I convert all sheets at once?

Yes. “All sheets (ZIP)” creates one CSV file per sheet, in a single ZIP file. Chart sheets have no cells and are listed as left out.

What's the difference between “As shown” and “Plain values”?

“As shown in Excel” writes what you see in Excel, including number and date formatting. “Plain values” writes dates as year-month-day and numbers without formatting, which databases and scripts read reliably.

Are formulas kept?

A CSV file can't hold formulas, so the value each formula showed is saved instead. The summary says how many formulas the sheet had.

Which separator should I choose?

Comma is the usual choice. Excel in many European countries expects semicolons. Tab-separated files are saved with the .tsv extension.

Does it work with old .xls files?

Yes. Old .xls workbooks can be converted to CSV, one sheet or all sheets.

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