How do I convert XLS to ODS?

Add your XLS file to the upload area above, then press Convert. The ODS file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to ODS reduce quality?

Text, structure and images carry over faithfully. Exact page layout does not, because ODS lays content out differently from XLS. Check headings, tables and page breaks in the result.

How large a file can I convert?

Up to 100 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

SpreadsheetLayout rebuiltRuns in your browser

XLS to ODS Converter

Turn XLS files into ODS in a couple of clicks. Excel's pre-2007 binary workbook. The open standard spreadsheet format. Content is preserved and the layout is rebuilt for the target format.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

XLS files (.xls) · up to 100 MB each

or paste files from your clipboard

Ready when you are

Drop a XLS file above and FileTools360 will turn it into ODS — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your XLS files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control delimiter and header handling.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

XLS and ODS explained

The pre-2007 Excel format is a binary structure limited to 65,536 rows and 256 columns — limits modern datasets routinely exceed.

ODS is the OpenDocument spreadsheet format, the open-standard counterpart to XLSX used by LibreOffice Calc.

Where XLS files come from: Spreadsheets from Excel 2003 or earlier, and some legacy export systems.
Where ODS is used: LibreOffice Calc and open-standards environments.

XLS vs ODS

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

XLS compared with ODS
Property	Source	Target
Compression	None	Lossless
Introduced	1987	2005
Browser support	Still opens in Excel and LibreOffice.	LibreOffice natively, Excel with basic fidelity.

XLS is stronger at: Still opens in Excel and LibreOffice.
ODS is stronger at: Open ISO standard. Formulas, formatting and multiple sheets. Default in LibreOffice.

Why convert XLS to ODS?

People make this switch when they run into the limits of XLS: anything else — XLSX is better in every respect. ODS is the better fit when working in LibreOffice or under an open-standards policy.

XLS limitations that prompt the switch: Hard row and column limits. Larger files than XLSX. Binary format that is awkward to parse.
What you give up: Excel support is imperfect, particularly for complex formulas. Less common in business.

What is preserved when converting XLS to ODS?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.