What is the difference between XLS and XLSX?

Is it better to use XLS or XLSX?

For compatibility, XLS has higher compatibility than XLSX. XLS is readable by all Microsoft Excel versions while XLSX is only readable by Excel 2007 and later versions. besides, XLS is able to hold the spreadsheets either including Macros or not, while XLSX isn't capable to support Macros.

How do I convert XLS to XLSX in Excel?

Click on the Office button, then Convert. You can also try opening the . xls file in Excel > then use the Save As command to save as an "Excel Workbook". Once you select that file type, the file extension will be xlsx and you can delete the old xls version.

Why is XLS bigger than XLSX?

Bigger range of cells. In an XLS workbook, the row limit is 65,536 (216) and 256 columns (28) which corresponds to column IV. Now with xlsx workbooks (and xlsm), limits are 1,048,576 rows (220) and 16,384 columns (214) or the column XFD.

Can XLSX be converted to XLS?

If you have a spreadsheet program on your computer that can open XLSX files (i.e. any version since Excel 2007), the easiest way to convert XLSX to XLS is to use the “Save as” function.