xlsxAbout xlsxtocsv.net
xlsxtocsv.net is a free, browser-based data conversion site for spreadsheets and structured files. It started with one focused job, turning Excel workbooks into clean CSV files, and now also helps move data between CSV, Excel, XML, and JSON without uploading files or creating an account.
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 converters with no sign-up, no file transfer, and honest behavior. The main XLSX to CSV converter exports every visible worksheet separately and skips hidden sheets. For other workflows, use CSV to Excel, Excel to JSON, JSON to Excel, XML to CSV, XML to Excel, or XML to JSON.
Preparing a workbook for an AI tool? Read our XLSX vs CSV for Claude guide before you decide which format to upload. If Excel shows broken characters after export, the CSV encoding guide explains UTF-8, BOM, and delimiter choices.
How conversion works
- You pick a file or paste data, and it is read by JavaScript running in your browser tab.
- Spreadsheet workbooks are read locally with the open-source SheetJS library.
- CSV, XML, and JSON conversions are generated on your device, with previews before download where the tool supports it.
- 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
- Each converter has a clear browser-side size limit to keep conversion fast and safe on everyday devices.
- 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.