You can remove leading, trailing, and extra spaces between characters and numbers in Excel using TRIM(), SUBSTITUTE() or Find and Replace.

Excel's Trim function will remove all but one space between words; however, it cannot remove non-breaking spaces – this requires a combination Excel's Substitute and Trim functions.

How to Remove Extra Unused Cells in Microsoft Excel 2013. Worksheets in Microsoft Excel can contain over a million rows and over 15,000 columns. With a workspace that large, if you're not careful ...