Quick Answer

Grammarly can affect a Turnitin AI score when many full-sentence rewrites make the prose more consistent. Limited grammar, spelling, and punctuation corrections are less likely to change the signal.

How the Issue Works

Students should accept suggestions selectively, compare versions, and keep wording that matches their own voice and understanding. Turnitin’s official AI-writing guidance explains that educator review is still required.

Why Results Can Change

Detector results vary with passage length, writing style, model updates, and the amount of revision. GPTZero’s published guidance also treats detection as a probability rather than proof.

What Students Should Check

Compare the draft with your outline, verify every source, and remove any claim you cannot explain. The process in this guide to improving AI-assisted text focuses on meaningful revision instead of cosmetic changes.

A Safer Improvement Workflow

Use Lunchbreak.ai to find repetitive passages and improve clarity, then review every suggestion against your notes. Keep earlier drafts so the final paper has a visible writing history.

Final Recommendation

Run a final check with Lunchbreak.ai, read the paper aloud, and confirm that the voice still sounds like you. Review this related detector guide and submit only work you can discuss and defend.