Grammarly Humanizer vs Turnitin: Will Turnitin Flag It?
Independent guide. Not affiliated with Turnitin, LLC. Read the Turnitin disclaimer.
Grammarly started as a spell-checker and now includes generative AI rewriting and a humanizer. That matters for Turnitin, because there's a big difference between fixing commas and letting AI rewrite whole sentences.
Grammar fixes vs AI rewrites
| What you used | Turnitin AI risk |
|---|---|
| Spelling and punctuation fixes | Low |
| Accepting "improve it" rewrites everywhere | Medium to high |
| Generating text, then humanizing it | High: target of paraphrase and bypasser detection |
Can Turnitin detect Grammarly's humanizer?
Turnitin's AI-paraphrase detection looks for AI-generated text modified by AI tools, and its August 2025 bypasser detection targets humanizer output. Grammarly's humanizer is an AI tool doing exactly that kind of modification, so it gets no special treatment. Results vary, which is the problem: you can't see the outcome in advance.
False flags from heavy editing
If you wrote the work yourself but accepted dozens of AI rewrites, parts of it can look machine-written. That's one of the most common reasons honest writers are surprised. See why Turnitin flags work you wrote.
What to do
- Keep Grammarly for spelling; write the sentences yourself.
- Check the file with a Turnitin AI report ($3.50).
- If parts are flagged, have a person rewrite them: $5.99 per 200 words with our editors.
Frequently asked questions
Does Grammarly's humanizer bypass Turnitin?
Not reliably. Text rewritten by AI tools, including humanizer features, can be flagged by Turnitin's AI-paraphrase and bypasser detection in English.
Will normal Grammarly spelling fixes raise my Turnitin AI score?
Basic spelling and grammar corrections usually don't. Accepting full-sentence AI rewrites across a whole document can.
How can I be sure?
Check the final file with a Turnitin AI report before submitting.
Flagged as AI? Our editors rewrite it by hand.
- Human editors, not another AI tool
- Aims for a 0% Turnitin AI score, proofreading included
- Fresh Turnitin AI report of the edited file as proof
- Delivered within 12 to 24 hours
See your Turnitin AI and similarity scores first.
- Turnitin similarity report (PDF)
- Turnitin AI writing report (PDF)
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