What’s the difference between line editing and proofreading?
The line edit is done on your typed manuscript before it is submitted to a publisher. After your manuscript has been accepted by a publisher, it is typeset. Then the publisher sends you a galley proof to go over one last time before the book is printed. This is your last chance (or the proofreader’s last chance) to correct any errors that slipped through at the line editing stage and to catch any errors made by the typesetter. The proofreader is looking for all kinds of problems: errors in spacing, type size, fonts, etc.