Excel ↔ CSV
Turn .xlsx sheets into CSV, or build a real .xlsx workbook from CSV.
Drop an .xlsx file
.xlsx
How it works
- Drop a file into the upload area, or paste your content into the input box.
- Choose the output format and options, then start the conversion.
- Download the result — everything runs in your browser and nothing is uploaded.
Frequently asked questions
What happens with multiple sheets and formulas?
One sheet is exported at a time; switch sheets on the page and export each separately. Dates use YYYY-MM-DD, and formulas show the calculated value stored in the file, not recalculated.
Do my files get uploaded to a server?
No. All 12 tools run inside your browser, so files never leave your device. Closing the tab ends the session.