Proofreading is a process whereby the text is being checked for grammar, syntax and spelling errors.

Editing implies looking at the document as a whole and checking that it has been put together in the best possible way. Editing can involve checking facts to ensure that information included in a text is accurate and checking that the text does not have any fundamental inconsistencies. The process includes research and often involves several revisions of the text and may require that portions of the document are removed, changed or that more text is added to make communication clearer.

Editing/proofreading is performed by experienced linguists and it is strongly recommended for all texts intended for publishing and public use.

Editing/proofreading is performed by native speakers of particular language and it serves as the final check and a guarantee that your documents are going to be idiomatic and thus accepted by the client.