Convert CSV to XLS
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 XLS
- 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 XLS files
Save each file individually or grab them all at once. Done.
Why convert CSV to XLS?
Converting CSV to XLS turns raw comma-separated data into a spreadsheet compatible with Excel 97-2003 — useful for legacy systems or software that hasn't been updated to accept modern XLSX.
CSV vs XLS at a glance
CSV is the universal data format — plain text rows and commas that every spreadsheet app, database and script can read. XLS is the legacy Excel format — a binary file superseded by XLSX in 2007, still floating around in old templates and archives.
| Property | CSV | XLS |
|---|---|---|
| Extension | .csv | .xls |
| Full name | Comma-Separated Values | Microsoft Excel 97-2003 Spreadsheet |
| First released | 1972 | 1987 |
| 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 | old Excel spreadsheets from Office 97-2003 that newer apps struggle to open |
CSV to XLS — frequently asked questions
Is this CSV to XLS converter really free?
Yes — completely free, with no sign-up, no watermarks and no daily limits.
Why convert to XLS instead of XLSX?
Only if you specifically need compatibility with Excel 97-2003 or software that doesn't support XLSX. Otherwise, CSV to XLSX gives a more robust, modern result.
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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