XLSX to CSV Converter

Convert an uploaded XLSX workbook sheet to CSV or JSON locally in the browser.

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This converter reads an XLSX workbook in the browser and exports the selected sheet as CSV, JSON or a compact sheet summary. It is useful when you need a quick copyable extract without uploading a spreadsheet to a server.

How it works

Choose an Excel workbook, enter the sheet name or leave the sheet field blank for the first sheet, then convert. A demo workbook preset is included for testing the output without selecting a file.

Privacy note

The workbook is parsed locally with a bundled library from /libs/. Large files can still be slow in the browser.