File size

[Slim Slender]

Why did an Excel workbook that was less than 1 MB in size blow up to more
than 30 MB? I'm pretty sure it isn't junk on a sheet that was deleted. It is
more likely related to about 10 sheets that were deleted.

 

[Gary''s Student]

Look for embedded objects, like pictures, or large pivot tables

 

[leungew]

Even every data in the excel is deleted, the size will still be pertained.
For my case, size is 15M!