Will numerical values be recognized as numbers in Excel?

Yes. Numeric fields are automatically typed as numbers in the generated XLSX cells.

Is my sensitive spreadsheet data uploaded to any server?

No. CSV parsing and XLSX building occur 100% inside local browser memory.

Yes. Comma, tab (TSV), and semicolon delimited files are parsed automatically.

Yes. In-browser JSZip memory compilation handles thousands of spreadsheet rows efficiently.

Yes. Numeric fields are automatically typed as numbers in the generated XLSX cells.

No. CSV parsing and XLSX building occur 100% inside local browser memory.

Yes. Comma, tab (TSV), and semicolon delimited files are parsed automatically.

Yes. In-browser JSZip memory compilation handles thousands of spreadsheet rows efficiently.

DeveloperOffline Ready · Zero Uploads

Convert CSV and TSV data files into native Microsoft Excel (.xlsx) workbook files directly in your web browser.

Drag & drop your files here, or click to browse

Supports .csv, .tsv, .txt up to 20MB.

Or paste / type input data below:

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