# Convert CSV to XLS

> Convert CSV to XLS online for free in seconds. Files are processed in a secure, isolated sandbox and deleted automatically. No sign-up, no watermarks.

URL: https://www.converterrr.com/csv-to-xls

- Runs in an isolated cloud sandbox with LibreOffice: files are deleted automatically, and the job uses cloud credits.
- Engines: LibreOffice (cloud).
- API: available. `POST /api/v1/jobs` with `"output_format": "xls"` (paid plans).
- More: [Spreadsheet converter](https://www.converterrr.com/spreadsheet-converter), [CSV converter](https://www.converterrr.com/csv-converter).

## How to convert CSV to XLS

1. **Add your CSV files.** Drag and drop CSV files onto the converter, paste them, or click to browse. You can add several at once.
2. **Choose XLS.** XLS is already selected. Open Options if you want to change quality, size or metadata.
3. **Convert.** Click Convert. Files are processed in a secure cloud sandbox and are usually ready in seconds.
4. **Download your XLS.** Download each XLS file, or everything at once as a ZIP.

## Good to know

- CSV files are typically used for data exchange between spreadsheets, databases and apps, while XLS is best for older Excel workbooks.
- This conversion runs on LibreOffice in an isolated cloud sandbox. Files are encrypted in transit and deleted automatically.

## CSV vs XLS

|  | CSV | XLS |
| --- | --- | --- |
| Full name | Comma-Separated Values | Microsoft Excel 97–2003 |
| Type | Spreadsheet | Spreadsheet |
| Extensions | .csv | .xls |
| MIME type | text/csv | application/vnd.ms-excel |
| Best for | data exchange between spreadsheets, databases and apps | older Excel workbooks |
| Properties | open standard | legacy format, proprietary |

**CSV:** CSV is plain-text tabular data with values separated by commas — the universal import/export format for spreadsheets and databases.

**XLS:** XLS is the legacy binary Excel format used before 2007.

The other way around: [convert XLS to CSV](https://www.converterrr.com/xls-to-csv).

## Related conversions

- [XLS to CSV](https://www.converterrr.com/xls-to-csv) (cloud)
- [CSV to PDF](https://www.converterrr.com/csv-to-pdf) (cloud)
- [XLSX to XLS](https://www.converterrr.com/xlsx-to-xls) (cloud)
- [CSV to DOCX](https://www.converterrr.com/csv-to-docx) (in the browser)
- [CSV to XLSX](https://www.converterrr.com/csv-to-xlsx) (cloud)
- [ODS to XLS](https://www.converterrr.com/ods-to-xls) (cloud)
- [CSV to EPUB](https://www.converterrr.com/csv-to-epub) (in the browser)
- [Numbers to XLS](https://www.converterrr.com/numbers-to-xls) (cloud)
- [CSV to TXT](https://www.converterrr.com/csv-to-txt) (in the browser)
- [TSV to XLS](https://www.converterrr.com/tsv-to-xls) (cloud)
- [CSV to HTML](https://www.converterrr.com/csv-to-html) (in the browser)
- [CSV to Markdown](https://www.converterrr.com/csv-to-md) (in the browser)

## Convert CSV to other formats

[CSV to PDF](https://www.converterrr.com/csv-to-pdf), [CSV to DOCX](https://www.converterrr.com/csv-to-docx), [CSV to XLSX](https://www.converterrr.com/csv-to-xlsx), [CSV to EPUB](https://www.converterrr.com/csv-to-epub), [CSV to TXT](https://www.converterrr.com/csv-to-txt), [CSV to HTML](https://www.converterrr.com/csv-to-html), [CSV to Markdown](https://www.converterrr.com/csv-to-md), [CSV to ODT](https://www.converterrr.com/csv-to-odt), [CSV to RTF](https://www.converterrr.com/csv-to-rtf), [CSV to ODS](https://www.converterrr.com/csv-to-ods), [CSV to LaTeX](https://www.converterrr.com/csv-to-tex), [CSV to IPYNB](https://www.converterrr.com/csv-to-ipynb), [CSV to FB2](https://www.converterrr.com/csv-to-fb2), [CSV to TSV](https://www.converterrr.com/csv-to-tsv), [CSV to reST](https://www.converterrr.com/csv-to-rst), [CSV to Typst](https://www.converterrr.com/csv-to-typ), [CSV to AsciiDoc](https://www.converterrr.com/csv-to-adoc), [CSV to Org](https://www.converterrr.com/csv-to-org), [CSV to MediaWiki](https://www.converterrr.com/csv-to-wiki), [CSV to OPML](https://www.converterrr.com/csv-to-opml), [CSV to DocBook](https://www.converterrr.com/csv-to-docbook), [CSV to Textile](https://www.converterrr.com/csv-to-textile), [CSV to JATS](https://www.converterrr.com/csv-to-jats), [CSV to Man](https://www.converterrr.com/csv-to-man)

## Convert other formats to XLS

[XLSX to XLS](https://www.converterrr.com/xlsx-to-xls), [ODS to XLS](https://www.converterrr.com/ods-to-xls), [Numbers to XLS](https://www.converterrr.com/numbers-to-xls), [TSV to XLS](https://www.converterrr.com/tsv-to-xls)

## CSV to XLS: frequently asked questions

### How do I convert CSV to XLS?

Drop your CSV file onto the converter above, make sure XLS is selected, and click Convert. When it's done, download the XLS file — it usually takes a few seconds.

### Is it safe to convert CSV to XLS here?

Yes. Your file is sent over an encrypted connection to an isolated sandbox that's created for your job only, then both the original and the result are deleted automatically.

### Is the CSV to XLS converter free?

Yes. Cloud conversions like this one use credits, and you get free credits every day (3 without an account, 10 with a free account).

### Will converting CSV to XLS reduce quality?

No — XLS preserves the content of your CSV file as faithfully as the format allows.

### Can I convert multiple CSV files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

### Can I convert XLS back to CSV?

Yes — use our XLS to CSV converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.