Convert XLS to OTS Online
XLS files are the legacy binary Excel spreadsheet format. Converting to OTS gives you OTS workflows.
How to convert XLS to OTS
- Upload your XLS file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose OTS as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert XLS to OTS?
XLS is the legacy binary Excel spreadsheet format. OTS is a OTS file, handled by the converthubor conversion engine. That difference is exactly why converting between them is so common: OTS is the better choice for OTS workflows.
XLS vs OTS: key differences
| XLS | OTS | |
|---|---|---|
| File type | legacy | file format |
| Typical use | legacy spreadsheets | OTS workflows |
| Compatibility | Superseded by XLSX. | Support for OTS depends on the application you use. |
Tips for a clean XLS to OTS conversion
- Superseded by XLSX.
- Use the highest-quality source XLS you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original XLS until you have checked the converted OTS opens the way you expect.
Frequently asked questions
How do I convert XLS to OTS?
Upload your XLS file to the converter on this page, make sure OTS is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this XLS to OTS converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting XLS to OTS reduce quality?
OTS uses its own compression, so the converted file is re-encoded. Quality loss is minimal at sensible settings, but keep the original XLS if you may need to convert again later.
What is a XLS file?
XLS is the legacy binary Excel spreadsheet format. Its technical name is Microsoft Excel 97-2003 and it is typically used for legacy spreadsheets.
What is a OTS file?
OTS is a OTS file, handled by the converthubor conversion engine. Its technical name is OTS and it is typically used for OTS workflows.
Can I convert XLS to OTS on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.