Spreadsheet Converter
Convert between CSV, Excel (XLSX) and JSON.
Drop in a spreadsheet, pick a format, download the converted file — your columns stay intact.
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About Spreadsheet Converter
The Spreadsheet Converter changes files between CSV, Excel (.xlsx) and JSON while keeping every column intact. Drop in a CSV, XLSX, XLS or TXT file — or paste CSV straight from your clipboard — pick the target format, and download the converted file seconds later.
Before converting, the page shows how your data was read: row and column counts, the detected delimiter (comma, semicolon, tab or pipe) and a preview of the first rows. Excel workbooks cannot be previewed by the browser, so they are read cell by cell on the server during conversion.
Converting to JSON produces an array of objects keyed by your header row, ready for scripts and APIs; converting to .xlsx yields a proper workbook that opens in Excel, Numbers and Google Sheets. Files are uploaded only for the conversion itself and are cleaned up automatically afterwards.
How to use Spreadsheet Converter
- Drop your spreadsheet onto the page (CSV, XLSX, XLS or TXT), browse for it, or paste CSV from your clipboard.
- Check the preview — row and column counts, the detected delimiter and the header row.
- Choose the target format: Excel (.xlsx), CSV (.csv) or JSON (.json).
- Click Convert and wait a moment while the file is processed.
- Download the converted file, or grab the same data in another format from the extra links.