Can I pick a different sheet?

This release reads the first sheet only and tells you the sheet name if there is more than one.

Do leading zeros survive?

Yes. Cells formatted as text with leading zeros, such as postal codes, keep them.

Are percentage and currency cells converted?

They use the underlying number without the display formatting symbols.

Is the workbook uploaded?

No. Everything runs in your browser.

Excel to CSV converter

Drop a workbook and download a CSV of its first sheet. Dates are written as YYYY-MM-DD, zero-padded numbers keep their leading zeros, and cells with formulas use the stored calculated value rather than the formula text.

The file is read locally with SheetJS in a Web Worker, so the conversion is private and the page stays responsive on large sheets.

Markdown / CSV Output

Drop a file to clean and export it

Processing stays in this browser. Guests can process up to 500 rows per file.

How to use this tool

1Drop your .xlsx or .xls file.
2Check the sheet note.
3Trim whitespace or remove empty rows if the sheet needs it.
4Download the .csv file.

Frequently asked questions

Can I pick a different sheet?: This release reads the first sheet only and tells you the sheet name if there is more than one.
Do leading zeros survive?: Yes. Cells formatted as text with leading zeros, such as postal codes, keep them.
Are percentage and currency cells converted?: They use the underlying number without the display formatting symbols.
Is the workbook uploaded?: No. Everything runs in your browser.

Private by design

This tool runs entirely in your browser. Files, tables, and results are never uploaded to a server — you can even disconnect your network and keep working. See the Privacy Policy.