xlsxAbout xlsxtocsv.net
xlsxtocsv.net is a free, browser-based tool that converts Excel workbooks (XLSX and XLS) into CSV files. It is built for one job and does it well: turn a spreadsheet into clean, portable CSV — fast, accurately, and without asking for anything in return.
Why this tool exists
CSV is the most universal data format: every spreadsheet program, database and script can read it. But existing converters often require uploads, accounts, file-size tiers, or silently merge your worksheets. We wanted a converter with no sign-up, no file transfer, and honest behavior — every visible worksheet exported separately, hidden sheets skipped. Preparing a workbook for an AI tool? Read our XLSX vs CSV for Claude guide before you decide which format to upload.
How conversion works
- You pick a file, and it is read by JavaScript running in your browser tab.
- The workbook is read locally with the open-source SheetJS library.
- Each visible worksheet is converted separately, and results are delivered as CSV files or a ZIP archive — all generated on your device.
- Nothing is sent over the network. There is no upload step and no server-side conversion.
Privacy by design
Because the converter runs entirely in your browser, your data physically never leaves your computer. There are no accounts, no cookies for tracking, and no third-party analytics. You can verify this yourself: open DevTools → Network while converting and watch that no request carries your file.
See our Privacy Policy for the full details.
Limits & expectations
- Files up to 10 MB are accepted, keeping conversion fast and safe on any device.
- CSV stores values only — formulas, formatting, charts, images, merged cells and macros are not preserved.
- Conversion runs in the background of your browser, so the page stays responsive while large files are processed.
Contact
Questions, feedback or bug reports? Email support@xlsxtocsv.net or visit the contact page.