Convert CSV to XLSX
Free, instant, and secure online converter. Upload your .csv file and receive a crisp .xlsx result in seconds.
Need the opposite conversion? Convert XLSX to CSV →
How to convert CSV to XLSX
Upload Your File
Click the upload zone or drag and drop your .csv file anywhere on the area.
Start Converting
Hit Convert and our server will process your file instantly with high fidelity preservation.
Download Result
Your .xlsx file is ready in seconds! Click download. Files auto-delete in 6 hours.
CSV vs XLSX: Comparison
| Attribute | CSV (.CSV) | XLSX (.XLSX) |
|---|---|---|
| Category | document | document |
| MIME Type | text/csv | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Description | CSV stores tabular data as comma-separated plain text, readable by almost any spreadsheet tool. | XLSX is the modern Microsoft Excel spreadsheet format. |
About These Formats
About CSV files
CSV stores tabular data as comma-separated plain text, readable by almost any spreadsheet tool.
About XLSX files
XLSX is the modern Microsoft Excel spreadsheet format.
Frequently Asked Questions
How do I convert CSV to XLSX?
Upload your .csv file using the box above, or drag and drop it in. We'll automatically convert it to .xlsx format — just click download when it's ready.
Is it free to convert CSV to XLSX?
Yes. Converting CSV to XLSX is completely free, with no watermarks, no signup, and no limit on how many files you convert.
Is it safe to convert files here?
Yes. Files are processed securely and automatically deleted from our servers a few hours after conversion. We never share or view the contents of your files.
What is a csv file?
CSV stores tabular data as comma-separated plain text, readable by almost any spreadsheet tool.
What is a xlsx file?
XLSX is the modern Microsoft Excel spreadsheet format.