Spreadsheet Conversion
Convert CSV to XLSX Online — Free
Fast, free CSV to XLSX converter. No registration required.
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How to Convert
1
Upload your .csv file by dragging it into the upload area or clicking to browse.
2
Choose your output settings. The default settings work great for most files.
3
Click Convert and download your .xlsx file when it's ready.
What is CSV?
CSV is a simple format for storing tabular data. Each line represents a row, with values separated by commas. It's universally compatible with spreadsheet applications.
Format Details
- Full Name
- Comma-Separated Values
- Extension
- .csv
Key Features
- Simple format
- Universal
- Data exchange
- Lightweight
What is XLSX?
XLSX is the modern Microsoft Excel format. It's the standard for spreadsheets containing data, formulas, charts, and pivot tables.
Format Details
- Full Name
- Microsoft Excel Spreadsheet
- Extension
- .xlsx
Key Features
- Spreadsheet
- Formulas
- Charts
- Data analysis
CSV vs XLSX
| Feature | CSV | XLSX |
|---|---|---|
| Full Name | Comma-Separated Values | Microsoft Excel Spreadsheet |
| Extension | .csv | .xlsx |
| Best For | Simple format | Spreadsheet |
Frequently Asked Questions
Yes. You can convert up to 5 files per day completely free, with no watermark or registration required.
Most files convert in under 30 seconds. Larger files (over 500MB) may take 1-3 minutes.
No. Our converter uses optimized encoding settings by default to preserve the original quality.
Free users can convert files up to 100MB. Pro users can convert files up to 2GB.
Yes. Our converter works in any modern web browser on any device.