Convert XLSX to CSV.
Excel sheets exported as clean CSV — all on your device.
Drop Excel files here
or browse your files
Paste with ⌘V · or drop files anywhere on the page
Files never leave your device. Everything runs in your browser, nothing touches a server — tools you've used even work offline.
Convert Excel workbooks to clean CSV entirely in your browser — dates and formulas come out as the values you see in Excel, and the delimiter is yours to pick. Drop .xlsx or legacy .xls, download the .csv. Nothing is uploaded.
How it works
- Drop files anywhere on the page, click to browse, or paste with ⌘V.
- Pick a quality or preset — or set an exact target size and let the tool find it.
- Compress, compare before/after, and download — individually or as a ZIP.
Values, not surprises
Cells export as Excel displays them: formulas become their computed values (never `=SUM(...)` text), dates keep their formatted form, and the file starts with a UTF-8 byte-order mark so Excel re-opens č, š, ž and every other accent correctly — the silent encoding bug this tool exists to avoid. Fully empty trailing rows are dropped, matching Excel’s own export.
Delimiters and multiple sheets
Comma is the default; pick semicolon for European Excel locales (where comma is the decimal separator) or tab for TSV. Workbooks with several sheets export the first one — the row note says so explicitly, nothing disappears silently. Need the reverse trip? CSV to XLSX is one click away.
Frequently asked questions
What happens to formulas?
They export as their last computed values — exactly what the cells showed in Excel. A formula that was never calculated exports as an empty field rather than formula text.
Why does the CSV start with an invisible character?
That is the UTF-8 byte-order mark. Excel needs it to read accented characters correctly; every other tool simply ignores it.
My workbook has several sheets — which one converts?
The first sheet, and the result row tells you when others were present. Duplicate the workbook with the sheet you need first, or export sheet by sheet.
Is my spreadsheet uploaded?
No. The whole conversion runs in your browser — the server only delivers this page. Financials, client lists, inventories: none of it leaves your device. Want proof? Run one file through, switch your connection off, and run another — it still works.