# Convert XLSX to XLS

> Convert XLSX 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/xlsx-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), [XLSX converter](https://www.converterrr.com/xlsx-converter), [Compress XLSX](https://www.converterrr.com/compress-xlsx).

## How to convert XLSX to XLS

1. **Add your XLSX files.** Drag and drop XLSX 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

- XLSX files are typically used for spreadsheets in Excel, Google Sheets and Numbers, 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.

## XLSX vs XLS

|  | XLSX | XLS |
| --- | --- | --- |
| Full name | Microsoft Excel Workbook | Microsoft Excel 97–2003 |
| Type | Spreadsheet | Spreadsheet |
| Extensions | .xlsx | .xls |
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | application/vnd.ms-excel |
| Best for | spreadsheets in Excel, Google Sheets and Numbers | older Excel workbooks |
| Properties | open standard | legacy format, proprietary |

**XLSX:** XLSX is the modern Excel workbook format with formulas, multiple sheets, charts and formatting.

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

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

## Related conversions

- [XLS to XLSX](https://www.converterrr.com/xls-to-xlsx) (cloud)
- [XLSX to PDF](https://www.converterrr.com/xlsx-to-pdf) (cloud)
- [XLSX to CSV](https://www.converterrr.com/xlsx-to-csv) (cloud)
- [CSV to XLS](https://www.converterrr.com/csv-to-xls) (cloud)
- [XLSX to HTML](https://www.converterrr.com/xlsx-to-html) (cloud)
- [ODS to XLS](https://www.converterrr.com/ods-to-xls) (cloud)
- [Numbers to XLS](https://www.converterrr.com/numbers-to-xls) (cloud)
- [XLSX to ODS](https://www.converterrr.com/xlsx-to-ods) (cloud)
- [TSV to XLS](https://www.converterrr.com/tsv-to-xls) (cloud)
- [XLSX to TSV](https://www.converterrr.com/xlsx-to-tsv) (cloud)

## Convert XLSX to other formats

[XLSX to PDF](https://www.converterrr.com/xlsx-to-pdf), [XLSX to CSV](https://www.converterrr.com/xlsx-to-csv), [XLSX to HTML](https://www.converterrr.com/xlsx-to-html), [XLSX to ODS](https://www.converterrr.com/xlsx-to-ods), [XLSX to TSV](https://www.converterrr.com/xlsx-to-tsv)

## Convert other formats to XLS

[CSV to XLS](https://www.converterrr.com/csv-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)

## XLSX to XLS: frequently asked questions

### How do I convert XLSX to XLS?

Drop your XLSX 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 XLSX 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 XLSX 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 XLSX to XLS reduce quality?

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

### Can I convert multiple XLSX 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 XLSX?

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