Konvizi
Free No upload
Drop your Excel files: they are converted to CSV on your device, without uploading anything.
Drop your Excel files here
or
Your files stay on your device
Konvizi’s “Excel to CSV” tool is free, with no sign-up, no watermark and no file limit. All the processing happens in your browser, on your device: your files are never uploaded to a server, which makes it suitable for personal and confidential documents.
Drag your Excel files into the area above or click “Choose files”. You can add several at once.
Your browser reads each file and creates the matching CSV file. Nothing is sent over the internet.
Get your CSV files one by one, or all together with “Download all”.
Excel (.xlsx) is the format of Microsoft Excel workbooks, which LibreOffice, Google Sheets and Numbers can also open. A workbook can contain several sheets, formulas and formatting.
But many programs, websites and import tools only accept plain data without formatting: a CSV file, or a PDF to share a table without it being changed.
CSV is a plain text file: each line is a table row, and columns are separated by commas or semicolons. It is the universal exchange format between spreadsheets, business software and databases.
CSV imports everywhere: spreadsheets, accounting software, mailing tools, online shops, databases. Konvizi saves it in UTF-8 with commas, so it opens correctly in Excel.
Customer lists, accounting, software exports: your spreadsheets stay on your device and are shared with no third party, which makes GDPR compliance simpler. Accents and special characters are preserved, and the CSV separator matches your language.
Your files never leave your device. No upload, no storage.
No upload and no queue: the conversion starts right away.
As many files as you like, with no imposed size limit.
No sign-up, no watermark, no subscription.
| Konvizi | Typical online converter | |
|---|---|---|
| Where your files are processed | In your browser, on your device | On the service’s servers |
| Upload to the internet | None | Required, then you download the result |
| Storage of your files | None: nothing is stored | Stored on a server, at least while processing |
| Waiting time | Starts instantly | Upload time, sometimes a queue |
| Account | Never required | Often required beyond a few files |
| Watermark and limits | No watermark, no maximum number | Common on free plans |
Yes, completely. No sign-up, no watermark, no maximum number of files: you can convert as many files as you like.
No. Everything happens in your browser, on your device. Your files are never sent over the internet: nobody but you can see them.
Each sheet becomes a separate CSV file named after it; “Download all” puts them together in a ZIP. The displayed values are used: formula results, and dates in YYYY-MM-DD format. Columns are separated by commas.
Konvizi reads workbooks in the .xlsx format, the default since Excel 2007. For an old .xls file, open it in Excel or LibreOffice, choose “Save as” in .xlsx format, then drop the new file here.
Open your browser’s developer tools (F12 key), go to the “Network” tab and run a conversion: no request carries your file. The site also enforces a security rule (Content-Security-Policy) that forbids the browser from contacting any site other than konvizi.com, and konvizi.com is a static site with no service able to receive files.
Yes. Konvizi works in the browser of your phone or tablet (Safari, Chrome…) just like on a computer, with no app to install. Very large files are processed faster on a computer, which has more memory.