1. Make a transparent signature PNG
Open the signature background remover, compare the mask with the source, and keep the removal gentle enough for thin strokes. Download PNG when the edge is ready.
2. Insert the PNG into Word
Choose Insert → Pictures → This Device, select the transparent file, and keep the original scan nearby while you position the copy.
3. Put the image on the signature line
Open Layout Options and choose In Front of Text when the image must sit over a printed line. Fix its position if the document will reflow.
4. Resize without stretching the handwriting
Drag a corner handle and keep proportions locked. Side handles change the shape of loops and pressure marks.
5. Export and inspect the final document
Save a PDF copy, check that the page shows through the transparent pixels, and keep the cleaned PNG in a private folder.