Convert CSV to XLSX Online
CSV files are a plain-text table format that every spreadsheet and database can import. Converting to XLSX gives you data analysis, budgets, reporting.
How to convert CSV to XLSX
- Upload your CSV file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose XLSX as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert CSV to XLSX?
CSV is a plain-text table format that every spreadsheet and database can import. XLSX is the modern Excel workbook format. That difference is exactly why converting between them is so common: XLSX is the better choice for data analysis, budgets, reporting.
CSV vs XLSX: key differences
| CSV | XLSX | |
|---|---|---|
| File type | tabular | editable |
| Typical use | data export, spreadsheets, databases, analytics | data analysis, budgets, reporting |
| Compatibility | Universal, but has no standard for encoding or quoting. | Supported by Excel, Google Sheets and LibreOffice. |
Tips for a clean CSV to XLSX conversion
- Universal, but has no standard for encoding or quoting.
- Use the highest-quality source CSV you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original CSV until you have checked the converted XLSX opens the way you expect.
Frequently asked questions
How do I convert CSV to XLSX?
Upload your CSV file to the converter on this page, make sure XLSX is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this CSV to XLSX converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting CSV to XLSX reduce quality?
Because both formats preserve the original data, converting back and forth does not degrade quality.
What is a CSV file?
CSV is a plain-text table format that every spreadsheet and database can import. Its technical name is Comma-Separated Values and it is typically used for data export, spreadsheets, databases, analytics.
What is a XLSX file?
XLSX is the modern Excel workbook format. Its technical name is Office Open XML Spreadsheet and it is typically used for data analysis, budgets, reporting.
Can I convert CSV to XLSX on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.