How to convert XLS to CSV
- Choose or drop your XLS files. You can add several at once.
- Check that “To” is set to CSV.
- Press “Convert to CSV” and download the results — or all of them as one ZIP.
XLS vs CSV
XLS — Excel 97–2003 workbook. XLS is the older binary Excel format, used before 2007. Modern Excel still opens it, but many newer tools and libraries only read XLSX.
CSV — Comma-separated values. CSV is plain text with one row per line and values separated by commas. Almost every app can import it, but it holds one table only — no formatting, formulas or multiple sheets.
Convert XLS to CSV when you need a file for importing data into databases, CRMs and other apps. XLS is better suited to very old versions of Excel.
FAQ
5Are my files uploaded anywhere?
No. The conversion runs in your browser using your own device’s processor. Your files are never sent to a server, so nobody — including us — can see them. You can even disconnect from the internet after the page loads.
Will I lose quality?
Values are exported as plain text with a UTF-8 byte-order mark so Excel shows accented characters correctly. Formatting and formulas are not kept (CSV cannot store them); formulas are exported as their results. A workbook with several sheets becomes one CSV per sheet.
Is there a file size or daily limit?
No limits, and no sign-up. Because nothing is uploaded, we don’t pay for your conversions and have no reason to cap them. Very large files are limited only by your device’s memory.
Can I convert many XLS files at once?
Yes. Add as many files as you like; each is converted to CSV, and “Download all” saves them together as a ZIP.
Does it work on iPhone and Android?
Yes. It works in any modern browser — Safari, Chrome, Firefox or Edge — on phones, tablets and computers. Older or low-memory phones may be slower with very large files.