Excel to CSV / JSON Converter
Convert Excel .xlsx spreadsheets to CSV or JSON and back — 100% in your browser, no upload
Excel → CSV / JSON
Drop an .xlsx / .xls file here, or click to choose
CSV / JSON → Excel
🔒 Your spreadsheet is parsed and converted entirely in your browser — nothing is uploaded.
Convert Excel files to CSV or JSON, right in your browser
Drop an .xlsx or .xls workbook and instantly preview any sheet as a table, then export it as clean CSV or a JSON array of row objects. Multi-sheet workbooks let you choose which sheet to convert. Paste CSV or a JSON array in the reverse panel to build a downloadable .xlsx.
Private by design
The whole conversion runs locally with the SheetJS engine — your spreadsheet is never uploaded to a server, so even confidential financial or customer data stays on your machine.
Frequently asked questions
Does my spreadsheet get uploaded anywhere?
No. Parsing and conversion happen entirely in your browser, so the file never leaves your device.
Can I convert CSV or JSON back into a real .xlsx file?
Yes. Paste CSV or a JSON array of row objects into the reverse panel, choose the input format, and download a genuine Excel .xlsx workbook.