Is it possible to edit a text matter on the scanned copy. If so, how to do it. Please guide. Thanks

Hi, calliaelma!

I would presume that it's already in an image format. Is it?

If so, you could try saving the document to one of your word processing programs.

Thanks!

Is it possible to edit documents after having them scanned? How?

Yes. Look into OCR (Optical character recognition) software.