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In-memory processing
CSV to Excel runs as JavaScript inside this tab.
Never uploaded
Safe for financials, contracts and NDAs.
No caps or sign-ups
File size is limited only by device memory.
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Convert CSV to Excel when you want to sort, filter, format or chart data exported from another system. The result is a standard .xlsx workbook that opens in Excel, Google Sheets, Numbers and LibreOffice.
Also known as CSV to XLSX.
Yes. Values are written exactly as they appear in the CSV, so IDs, phone numbers and postcodes keep their leading zeros instead of being turned into numbers. Each line of the CSV becomes one row.
Yes. CSV to Excel runs entirely inside your web browser using JavaScript, so the file never leaves your device. It is safe for confidential documents such as contracts, financial records and IDs.
There is no fixed limit, because the file is processed on your own device. Very large files depend on your device's available memory; a modern laptop or phone handles hundreds of megabytes.
Yes. ZapConvert runs in any modern browser, including Safari on iPhone and iPad and Chrome on Android, with nothing to install. You can add several files at once and download them together as a ZIP.