How to convert CSV to Excel (XLSX)
- Paste CSV content or drop a file.
- Adjust options such as delimiter or indentation.
- The Excel (XLSX) output is generated instantly.
- Copy it or download the file.
Why convert CSV to Excel (XLSX)?
CSV is excellent for data import/export between apps, but it has some limitations:
- No formulas, formatting or multiple sheets
- Bangla text needs UTF-8 encoding to display correctly
Converting to Excel (XLSX) gives you:
- Formulas and multiple sheets
- Opens in Excel, Google Sheets and LibreOffice
- Great for calculations
CSV vs Excel (XLSX): side-by-side comparison
| Feature | CSV | Excel (XLSX) |
|---|---|---|
| Full name | Comma-Separated Values | Microsoft Excel Open XML Spreadsheet |
| File extension | .csv | .xlsx, .xls |
| Type | Data | Document |
| Compression | Plain-text table | Editable |
| Transparency | No | No |
| Animation / multi-frame | No | No |
| Introduced | 1972 | 2007 |
| Developed by | RFC 4180 | Microsoft |
| MIME type | text/csv | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Best for | data import/export between apps | tables, accounts and data analysis |
What are CSV and Excel (XLSX) files?
CSV (.csv)
CSV stores a table as plain text with values separated by commas. Almost every spreadsheet, database and CRM can import and export CSV.
Excel (XLSX) (.xlsx, .xls)
XLSX is the Microsoft Excel spreadsheet format. It stores tables, formulas, multiple sheets and formatting, and is used for accounts, results sheets, price lists and data analysis.
Tips for the best Excel (XLSX) results
- Save CSV files as UTF-8 so Bangla and other non-English text is preserved when opened in Excel.
- Bookmark this page or install the app to convert CSV files offline next time.
Private by design: how this converter works
Unlike typical online converters that upload your file to a remote server, this CSV to Excel converter processes everything on your own device using fast JavaScript parsers (SheetJS, js-yaml, marked) running locally. Your file is read into browser memory, converted, and offered back as a download — it is never sent to us.
- No upload wait — conversion starts instantly, even on slow mobile data.
- Private — safe for NID copies, certificates, bank statements and personal photos.
- No limits — no daily quota, no queue and no watermark.
- Offline-ready — once loaded, many tools keep working without internet.
Frequently asked questions
Is this CSV to Excel (XLSX) converter free?
Yes — free, unlimited and without watermarks or sign-up.
Are my CSV files uploaded to a server?
No. Conversion happens inside your browser on your own device, so your files stay private.
Will I lose quality converting CSV to Excel (XLSX)?
Excel (XLSX) preserves the quality of your source file exactly — though it cannot restore detail already lost in the original CSV.
Can I convert several files at once?
Yes. Drop multiple files and download them individually or together as a ZIP.
Does it work on iPhone and Android?
Yes. It works in Chrome, Safari, Edge and Firefox on phones, tablets and computers. You can also install the site as an app.
What is the difference between CSV and Excel (XLSX)?
CSV (Comma-Separated Values) is plain-text table and best for data import/export between apps, while Excel (XLSX) (Microsoft Excel Open XML Spreadsheet) is editable and best for tables, accounts and data analysis.