"I think I did pretty well considering I started out with a bunch of blank paper." Steve Martin, comedian and novelist, author of Shop Girl
What copyeditors do:
My copyediting service includes going carefully through your manuscript with a perfectionista's eye, finding and correcting errors in grammar, usage, mechanics, and spelling (the latter generally involves detecting homonym errors--e.g. "led" and "lead"-- which our spell-check gremlins pointedly ignore). I will use the Track Changes feature of Microsoft Word to offer you a “click and go” means to instant gratification and a polished manuscript.
I do not include fact-checking in my copyediting (for example, if your nonfiction memoir mentions a restaurant located in a particular place at a particular time, I will not be checking to see whether that restaurant did in fact exist in that place and time--I leave that to the author or another editor along the way). I will, however, write you an Author Query note on every question I have concerning inconsistencies in time, characters (e.g., "Weren't Jane's eyes blue in your earlier descriptions of her character?"), and similar matters.
"I just want to tell you again how invaluable your comments were, and just the marvelous way that you have with giving feedback. You are an amazing editor." Cynthia Reyes, Associate Professor College of Education and Social Services University of Vermont