What happens when you convert XLSX to XLS
- All sheets are converted.
- Formulas are saved as their last calculated values; formatting, charts and merged cells aren't carried over.
- XLS holds at most 65,536 rows and 256 columns. Bigger tables need XLSX.
XLSX vs XLS
| Feature | XLSX | XLS |
|---|---|---|
| Multiple sheets | Yes | Yes |
| Formulas | Yes | Yes |
| Numbers & dates | Yes | Yes |
| Nested data | No | No |
| Best for | Spreadsheets with several sheets | Old Excel versions |
How to convert XLSX to XLS
- Drop your XLSX files on the box above, or click it to choose files. You can add many at once.
- Adjust the options if you want. The defaults work well for most files.
- Click Download for each XLS file, or "Download all" to get a ZIP.
Frequently asked questions
Is it safe to convert my files here?
Yes. Conversion happens entirely in your browser. Your files are never uploaded to a server, so nobody else can see them.
Is it free? Are there limits?
It's completely free, with no sign-up, watermarks or daily limits. The only limit is your device's memory for very large files.
Can I convert many XLSX files at once?
Yes. Drop as many files as you like; they're converted one after another and you can download them all as a ZIP.
What happens to formulas and formatting?
Each formula is saved as its last calculated value. Cell values, numbers, dates and text are kept; formatting, charts and merged cells aren't.
What about workbooks with several sheets?
Every sheet is converted and kept in the XLS file.