Word can insert the word count into your document and update that information as often as you want.
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Select in your document where you want the word count to appear.
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Go to Insert > Quick Parts > Field.
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In the Field names list, select NumWords, and then select OK.
To update the information, right-click where you added the field and then choose Update Field.
If you’d like the information to update automatically when you print, select File > Options > Display and then under Printing options select Update fields before printing.
