Excel to CSV / JSON

Convert .xlsx sheets to CSV or JSON

Open an Excel workbook, preview each sheet and export it as CSV, TSV or JSON, without uploading the file.

Excel
XLSX
CSV
JSON

How to use Excel to CSV / JSON

Choose an Excel .xlsx file.
Pick the sheet you want and check the preview.
Choose CSV, TSV or JSON (for JSON, say whether the first row is the header).
Download the sheet, or download every sheet at once as a ZIP.

How it works

An .xlsx file is a ZIP of XML files. The tool unzips it in your browser, reads the sheet list, the shared text table and the cell styles, then turns each cell into text: shared and inline strings, numbers, TRUE/FALSE, error codes, and dates (cells with a date format) as ISO dates. Merged cells are filled with their value and empty trailing rows and columns are dropped.

Limits

Only .xlsx and .xlsm files; legacy .xls and password-protected workbooks are rejected.
Files up to 100 MB and 5 million cells.
Shows stored values, not number formatting (currency symbols, thousands separators or rounding as shown in Excel).
Formulas are exported as their last calculated value; charts, images and comments are ignored.

Privacy

The workbook is read entirely in your browser. Nothing is uploaded, stored or put in the page address.

Frequently asked questions

Why does a date show as 2024-01-31 instead of 31/01/2024?

Dates are exported in the ISO format (year-month-day) so they sort correctly and import into any tool without ambiguity.

Can I convert an old .xls file?

Not directly. Open it in Excel, LibreOffice or Google Sheets, save it as .xlsx, then convert that file.

What happens to merged cells?

Every cell in a merged range gets the merged value, so each row of the export is complete.

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