If you want the image to be constrained to a particular size, create a 1-cell table with a cell that size, fixing the row height and column width.



Beyond that, if you insert a picture and want to make sure it's a certain size afterwards, right click on it and choose Format Picture > Size where you can adjust the size to exactly what you want.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]