zapadias, have a look here and see if this helps

http://www.contextures.com/xlfaqApp.html#Unused
--
Paul B
Always backup your data before trying something new
Please post any response to the newsgroups so others can benefit from it
Feedback on answers is always appreciated!
Using Excel 2002 & 2003

"zapadias" wrote in message
...
I used a macro to import data into a new worksheet. there isn't a great
deal
of info the spreadsheet (probably about 29KB) but the worksheet has a size
in
excess of 29MB. It seems to be filled with blank cells (no formulae) as
the
scroll bar on the right is tiny and if you drag it to the bottom the row
number shows 60-odd thousand. How can I reduce this file so it just saves
the
cells with data? The worksheet itself does not have a macro within it.