Open CSV Files as Excel Online – Without Broken Columns
You double-click a CSV export and Excel shows everything in column A, “Müller” turns into “Müller” and customer number 00123 becomes 123. Sehnna converts the CSV into a real XLSX file so the data opens correctly.
Your files stay on your device. Conversions run in your browser.
Your files stay on your device. Conversions run in your browser.
- No signup required
- Files stay on your device
- Browser-based conversion
- Fast download
- Free to use
Common CSV problems this fixes
- All data in one column because of a comma vs. semicolon mismatch.
- Broken umlauts and accents because of the wrong text encoding.
- Leading zeros removed from IDs, postcodes and phone numbers.
- Long numbers shown as 1.23E+15.
Where CSV files come from
Online banking exports, shop orders, CRM contacts, analytics reports and accounting software usually export CSV. Convert them once with Sehnna and continue working in Excel, Google Sheets or Numbers.
Privacy: your files stay on your device
Your files stay on your device. Conversions run in your browser. Sehnna never uploads, stores or reads your documents – there is no server that receives them, no account and no email address.
- Your files stay on your device
- No signup required
- Browser-based conversion
CSV to Excel online – questions and answers
Which separators are supported?
Comma, semicolon, tab and pipe. The separator is detected automatically.
Will accents and umlauts display correctly?
Yes. UTF-8 and Windows (ANSI) encodings are detected automatically.
Is my CSV uploaded?
No. The CSV is converted in your browser and stays on your device.
Can I convert back from Excel to CSV?
Yes, use the Excel to CSV converter.