How it works
Upload an .xlsx or .xls file and the tool reads the first sheet's cells, converts formula cells to their last calculated value, and writes everything out as a standard comma-separated CSV file you can open anywhere.
Excel to CSV
Convert an Excel spreadsheet into a plain CSV file — no sign-up, no upload, no file size limit.
Drop an Excel file here, or click to browse
Your files never leave your device. Everything runs locally in your browser — nothing is uploaded to a server, so there's no file size limit, no subscription, and no one but you ever sees what's in your file.
Frequently asked questions
My file has multiple sheets — what happens to the others?+
Only the first sheet is converted — CSV is a single-table format, so there's no way to represent multiple sheets in one file. If you need the other sheets too, reorder them in Excel first (or convert each one separately by saving it as its own file).
Will formulas be converted to their values?+
Yes — CSV has no concept of formulas, so each formula cell's last calculated result is written out as plain text instead of the formula itself.
What about cell formatting, colors, and merged cells?+
CSV is plain text only, so all formatting, colors, fonts, and merged cells are dropped — only the raw values remain. This is expected and unavoidable for the format, not a bug in the conversion.
Is my file uploaded anywhere?+
No. This tool runs entirely in your browser using JavaScript — your spreadsheet is read, converted, and downloaded without ever being sent to a server.
Keep a backup of your original file. This tool processes everything locally in your browser, and we've tested it carefully — but no conversion tool handles every PDF perfectly. Always keep your original file and double-check important results before relying on them.