Active Voice vs Passive Voice: When to Use Each

The advice to 'use active voice' is so common that many writers assume passive voice is simply wrong. It isn't. Both forms are grammatically correct, and both serve different communicative purposes. Understanding when to use each — rather than mechanically avoiding passive voice — is a mark of a sophisticated writer.

Active voice: the subject performs the action ('The researcher conducted three experiments'). Passive voice: the subject receives the action ('Three experiments were conducted'). Active voice is generally more direct, vigorous, and easier to read. It's preferred in most writing contexts because it makes agents and actions clear: who did what.

Passive voice is appropriate when the agent is unknown ('The package was delivered overnight'), unimportant ('Errors were made'), or deliberately obscured for rhetorical reasons. Scientific writing traditionally uses passive voice in methods sections ('The solution was heated to 90°C') to emphasize the process over the individual performing it. This is a convention, not a flaw.

A good rule of thumb: use active voice by default, and switch to passive when there's a specific reason — the agent is irrelevant, you want to vary sentence structure, or disciplinary conventions require it. paraphraserhumantext's grammar checker flags excessive passive voice usage, and the tone changer can help shift writing toward a more active, direct register when your draft feels flat.