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Convertto

CSV to Excel Converter

Convert CSV data into a real .xlsx workbook.

CSV to Excel Converter reads the workbook in your browser with SheetJS — every sheet, every cell — and writes the data as XLSX. Financial data, payroll and customer lists never leave your device.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Are formulas converted or their results?

Their results. Excel stores both the formula and its last calculated value, and the value is what belongs in exported data. If a cell arrives empty, the workbook was saved without cached results — open and re-save it in Excel.

Is my spreadsheet uploaded?

No. The file is parsed by JavaScript in this tab and never sent anywhere.

How to use the csv to excel converter

  1. 1Select your spreadsheet — the file stays on your device and is never uploaded.
  2. 2Press Run, then download the result when it is ready.

Embed this tool

Put the working csv to excel converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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