Convert CSV to XLSX
Free and instant — your CSV files are processed securely on our servers and deleted right after conversion. Nothing is stored.
How to convert CSV to XLSX
- Step 01
Add your CSV files
Drop them into the box above or click to browse. You can add several files at once.
- Step 02
Conversion starts instantly
Your file is sent to our servers, converted and deleted right away — no sign-up, no queue, no waiting.
- Step 03
Download your XLSX files
Save each file individually or grab them all at once. Done.
Why convert CSV to XLSX?
Converting CSV to XLSX turns raw comma-separated data into a proper Excel spreadsheet — ready for formulas, formatting, charts and multiple sheets. The standard first step after exporting data from a database or web service.
CSV vs XLSX at a glance
CSV is the universal data format — plain text rows and commas that every spreadsheet app, database and script can read. XLSX is the standard spreadsheet format — rows, columns, formulas and charts in a file every version of Excel and most office suites can open and edit.
| Property | CSV | XLSX |
|---|---|---|
| Extension | .csv | .xlsx |
| Full name | Comma-Separated Values | Microsoft Excel Spreadsheet |
| First released | 1972 | 2007 |
| Developed by | IBM (early usage); standardized informally over decades | Microsoft |
| Compression | Lossless | Lossless |
| Transparency | No | No |
| Animation | No | No |
| Best for | raw tabular data — imports, exports and data pipelines | editable spreadsheets, data tables and financial reports compatible with Microsoft Excel |
CSV to XLSX — frequently asked questions
Is this CSV to XLSX converter really free?
Yes — completely free, with no sign-up, no watermarks and no daily limits.
Will columns be detected automatically?
Yes — commas (or semicolons, detected automatically) split the data into columns, and each row becomes a spreadsheet row.
Will number and date formatting be applied?
Values are placed as plain text or numbers; specific formatting like currency or date styles must be applied afterwards in Excel.
Is the conversion private?
Your CSV is sent to our servers, converted using LibreOffice, and the result is returned to you. Your file is deleted immediately after conversion and never stored.
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