Convert CSV to Excel, free in your browser

Convert CSV or TSV rows to an Excel workbook (.xlsx) in your browser. Cell values remain text, preserving leading zeros and identifiers.

How to convert CSV to Excel

1. Choose a CSV or TSV file.
2. Choose whether the first row contains column names.
3. Convert and download the Excel workbook.

Limits & good to know

• CSV and TSV files up to 50 MB are processed on your device.
• Values are stored as text; formulas, dates, and number formats are not inferred.
• The workbook contains one worksheet named Data.

Frequently asked questions

Are my files uploaded to a server?

Your files are processed on your device, not uploaded to our servers. Your file and edits are saved in this browser for recovery, and previous documents remain in Saved drafts when you open another file. Use Saved drafts to resume or delete individual copies, or clear this site’s browser data to remove all copies. Browser storage can be cleared or become unavailable; download important work.

Will Excel remove leading zeros from IDs?

No. Values are stored as text in the generated workbook so identifiers such as 001 remain unchanged.

Are formulas or dates created automatically?

No. Every source value is kept as text to avoid silently changing its meaning.

Is this really free, or free "until you hit a limit"?

Really free. Unlike most "free" PDF sites there is no task-per-day cap, no locked Pro features, no watermark stamped on your file, and no payment step before download. Every tool is the full tool.