XLS
Excel 97–2003 workbook
XLS is the binary workbook format Excel used until 2007. It is limited to 65,536 rows per sheet and is treated as a legacy format today.
Opens in Excel and LibreOffice Calc
XLS converterXLS to XLSX converter, without the upload.
Turn XLS spreadsheets into XLSX. It is converted in your browser, so the file never leaves your device.
Drop XLS files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
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- On your device · nothing is uploaded
- No account, no email
- Batch and ZIP download
- Free
How to convert XLS to XLSX
Add your XLS spreadsheets
Drop XLS files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
XLSX is already chosen
Press Convert. There is nothing else to set. The work happens in this tab.
Download
Save the XLSX, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The XLS to XLSX converter is part of this page and runs inside your browser. Your spreadsheets are never sent to ToAny or to anyone else.
No upload, no queue
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
Free, without an account
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
XLS to XLSX: what to expect
XLS is limited to 65,536 rows and is flagged as a legacy format by modern Excel. XLSX opens straight into Excel with columns and data types intact. XLS is at home in compatibility with very old copies of Excel; XLSX is the usual choice for spreadsheets with formulas, formatting and several sheets.
Every sheet is kept, under its own name. XLSX holds at most 1,048,576 rows and 16,384 columns per sheet.
XLS vs XLSX
XLSX
Excel workbook
XLSX is Excel's format since Office 2007. A workbook can hold many sheets with formulas, formatting and charts. Programs and scripts usually prefer the same data as CSV or JSON.
Opens in Excel, Google Sheets, Numbers, LibreOffice Calc
XLSX converter| XLSExcel 97–2003 workbook | XLSXExcel workbook | |
|---|---|---|
| Stands for | Excel 97–2003 Workbook | Office Open XML Workbook |
| Type | Spreadsheet workbook (binary) | Spreadsheet workbook |
| Compression | None | ZIP container of XML |
| Introduced | 1997, by Microsoft | 2007, by Microsoft |
| Opens in | Excel and LibreOffice Calc | Excel, Google Sheets, Numbers, LibreOffice Calc |
| Best for | Compatibility with very old copies of Excel | Spreadsheets with formulas, formatting and several sheets |
| File extension | .xls | .xlsx |
Questions
Are my spreadsheets uploaded anywhere?
No. The XLS to XLSX conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
Is anything lost when converting XLS to XLSX?
The values are kept. Anything XLSX has no way to express, such as formatting, formulas or nesting, is simplified or left out.
Can I convert several XLS files at once?
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
How do I convert XLS to XLSX on Windows, Mac, iPhone or Android?
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the XLS file, press Convert and save the XLSX. There is nothing to install.
Is there a file size limit?
Yes. Spreadsheet files up to 150 MB are accepted; a larger file is refused with a message. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.