Grammarly is on millions of laptops, and it now includes AI detection features. That raises two questions: can Grammarly tell if you used ChatGPT, and can using Grammarly itself make your writing look AI-generated?
Quick Answer
Grammarly's AI detector estimates how AI-like a text looks, and its Authorship feature records how a document was written. Separately, heavy use of Grammarly's rewrite suggestions can make human writing look more uniform and raise scores on other detectors, such as GPTZero.
Two Different Things: Detector and Authorship
- AI detector — scans text and estimates how much looks AI-generated, based on wording and structure. Like any detector, it is probabilistic.
- Authorship — tracks how a document was created in Grammarly: typed, pasted or AI-generated. It gives a report from the writing process itself, instead of inferring from the finished text.
Authorship is useful because it is evidence rather than a guess. A writer can show a reader which parts they wrote and which they pasted or generated.
Why Grammarly Edits Can Raise an AI Score
Spelling and grammar fixes are harmless. The risk comes from rewrite and tone suggestions that smooth a whole sentence. Detectors look for predictable, even text, and heavy polishing removes exactly the small irregularities that make writing look human.
What to Do
Use suggestions selectively
Accept corrections, but rewrite tone and style changes in your own words.
Keep sentence variety
Mix short and long sentences. Don't let polishing flatten your rhythm.
Humanize AI-assisted drafts
If a draft started with ChatGPT, run it through Fresh Text to restructure it, then proofread.
Keep your drafts
Version history and Authorship reports are the best proof the work is yours.
Frequently Asked Questions
Does Grammarly detect ChatGPT?▾
Grammarly has an AI detector that estimates how much of a text looks AI-generated, and it also offers Authorship, which tracks how a document was written. Both are meant to help writers show where their text came from.
What is Grammarly Authorship?▾
Authorship records how a document is built: what was typed, pasted or generated with AI. It produces a report that can show a reader which parts were written by you, rather than guessing from the final text.
Can using Grammarly make my writing look AI-generated?▾
It can. Grammarly's rewrites and polishing tend to smooth out natural variation, and detectors may read very polished, uniform text as more predictable. Heavy use of rewrite suggestions can raise an AI score on other detectors.
Does Grammarly's AI score match Turnitin or GPTZero?▾
No. Each detector is trained differently, so the same text can score differently across tools. Check with the one your school or client actually uses.
How do I keep my writing from looking AI-generated?▾
Keep your own voice and sentence variety, use rewrite suggestions sparingly, add specific personal detail, and keep your drafts so you can show how the work developed.
Conclusion
Grammarly can estimate AI use and, through Authorship, document it. Its heavier rewrite tools can also push human writing toward the uniform patterns detectors flag. Use it for corrections, keep your own voice, and keep evidence of how you wrote.