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Excel to CSV converter

Convert an .xlsx or .xls workbook to CSV without opening Excel and without uploading the file — pick a sheet if there is more than one, preview the result, and download a UTF-8 CSV that keeps non-English text intact when it is reopened.

  • Nothing you type leaves this page
  • Works offline once loaded
  • Free forever, no signup
Drop an .xlsx or .xls file here, or tap to choose Client lists, salary sheets — nothing is uploaded, parsing happens right here in the tab

How to use this tool

  1. Drop your Excel file

    If it has more than one sheet, a sheet selector appears.

  2. Check the preview and options

    Pick the output delimiter and decide whether to add a UTF-8 BOM.

  3. Download the CSV

    Or download one CSV per sheet in a single click for a multi-sheet workbook.

Questions people ask

Why does my CSV show weird characters (अ) when I open it in Excel?

Excel needs a UTF-8 byte-order mark (BOM) to recognise the file as UTF-8 — without it, Excel guesses the system code page and mangles Hindi or other non-ASCII text. This tool adds the BOM by default so the CSV opens correctly; turn it off only if the CSV is headed somewhere that specifically rejects a BOM.

My workbook has several sheets — what happens to them?

A sheet selector appears so you can convert one sheet at a time, or use "Download one CSV per sheet" to export all of them together in a single click.

Do formulas survive the conversion?

CSV has no concept of formulas — the conversion exports each formula's last calculated value, exactly as Excel displays it, not the formula text itself.

My leading zeros disappeared before I even got here — can this fix them?

If Excel already auto-typed a column (turning "007" into 7) before you saved the file, that data is already gone — this converter reads what the file actually contains, it cannot recover a value Excel itself discarded. Going forward, format that column as Text in Excel before typing into it.

Is my spreadsheet uploaded anywhere?

No — reading the workbook and writing the CSV both happen in your browser via SheetJS running locally. Nothing about a client list or a salary sheet leaves your device.

Related tools

Bookmark this page — the tool keeps working offline, and your settings stay in this browser. Built by Dynamb Technologies, who make software for a living.