Copy editing, sometimes called sub-editing in certain newsrooms, is the process of reviewing written material to improve clarity, accuracy, consistency and overall readability. A copy editor works with copy—the raw text destined for publication—and applies a mix of linguistic skill, editorial judgment and attention to detail to prepare it for production. The aim is not to rewrite the author’s voice but to ensure the content communicates effectively, adheres to a chosen style, and is free of mechanical errors.

Common tasks and focus areas

Typical copy-editing tasks range from straightforward mechanical corrections to more interpretive edits that affect meaning. Key tasks include:

  • Correcting spelling, capitalization and punctuation, including house-style choices for quotation marks and hyphenation (punctuation).
  • Checking and repairing grammar, syntax and sentence construction (grammar).
  • Improving clarity and flow by tightening sentences, reorganizing paragraphs, and removing ambiguity.
  • Ensuring consistency in names, dates, numbers, references and formatting across a document.
  • Verifying factual details where responsibility and resources permit, and flagging possible errors to the author or editor.

Workflow: where copy editing fits

Copy editing is typically part of the production phase. In many publishing processes it occurs after substantive editing and before final typesetting or printing. The copy editor prepares the text so it can be set into pages or a digital layout; that step is often described as typesetting or composition. After typesetting a separate proofreading pass catches any remaining errors introduced during layout; in traditional print processes this precedes printing. For online publishing, copy editors often work directly with content management systems and may also adapt copy for metadata, headlines and search optimization.

Regional titles and roles

Different publishing sectors and regions use varied titles and hierarchies for copy editors. In the United States (US) and Canada (Canada) the common job title is "copy editor"; senior staff may be called copy chief, copy desk chief or news editor. In parts of the United Kingdom and other countries that follow UK industry terms the role in newspapers and magazines is often called "sub-editor" or informally "sub". In book publishing the term "editor" can carry broader acquisition and content responsibilities, while subs or copy editors focus on line-level accuracy and style (UK usage).

History and evolution

The role of the copy editor developed alongside the growth of mass printing and newspapers in the 19th and 20th centuries, as publications required systematic checks to maintain standards. Historically tied to print production, copy editing has adapted to digital formats: contemporary copy editors must understand web publishing, metadata, search conventions and sometimes basic coding or content management tools. Despite technological change, the core skills—grammar, attention to detail, and clear judgment—remain central.

Importance, examples and limits

Copy editing improves reader comprehension, reduces factual and legal risk, and enforces a publication’s style. Examples of copy-editor interventions include reconciling conflicting dates, standardizing terminology across a long report, or rewriting a headline for clarity while preserving tone. Copy editors must balance precision with respect for an author’s voice and avoid altering meaning without consultation. In fast-moving newsrooms or small digital teams, one person may combine copy-editing duties with fact-checking and layout tasks; in larger organizations roles are more specialized and supervised by senior editors.

Notable distinctions: copy editing is distinct from developmental editing (which shapes structure and content at a high level) and from proofreading (the final check after layout). Good copy editing makes text easier and safer to publish without erasing the writer’s intent.