Data converter · runs 100% in your browser

XLSX to CSV Converter

Convert Excel sheets to CSV. Pick one sheet or get every sheet as its own CSV file. The whole conversion runs in your browser via SheetJS — no upload, no signup, no row limit.

No uploadNo signupNo trackingFree, unlimited
Drop your XLSX file here
or click to choose a file

How to use

  1. Drop your XLSX file.
  2. Pick a sheet from the dropdown (or "All sheets" to get one CSV file per sheet).
  3. The converter parses the file locally and produces CSV.
  4. Click Download.

FAQ

Are formulas evaluated?

Cell values are exported as their last-saved values, not as formulas. If a formula was unevaluated when the file was saved, the result will be empty.

Does my spreadsheet upload to a server?

No. Conversion runs entirely in your browser using WebAssembly and Web APIs. Open the Network tab in DevTools while you convert — you'll see no outbound traffic carrying your file.

Is this really free?

Yes. No signup, no quota, no upgrade tier. The conversion runs on your machine, so it costs us nothing to host.

Is there a file size limit?

Browser memory is the only ceiling. On a modern desktop browser, a few hundred megabytes works fine. Mobile devices have tighter limits.

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