Direct answer
No, Grammarly cannot reliably bypass Turnitin's AI detector. Grammarly is a grammar and writing assistant, not a tool built to evade AI detection, and text produced by its generative AI features can be flagged just like ChatGPT or Claude output [1]. Light corrections — fixing commas, swapping a synonym or two — rarely remove the statistical patterns Turnitin's detector looks for, so an AI-written essay that was only polished with Grammarly can still return a high AI score. If you need a lower score before submitting, the realistic fix is deeper rewriting or a dedicated AI humanizer, not Grammarly.
Will Turnitin Flag Text That Was Written or Edited With Grammarly?
The honest answer is "it depends on which Grammarly feature you used." Turnitin's AI writing report does not flag documents because they were opened in Grammarly; it flags passages of prose it believes were produced by an AI writing tool [2]. Classic grammar tools correct your existing sentences and do not author new text, so ordinary spell-check and punctuation fixes are unlikely to trigger a flag by themselves.
Grammarly's generative features are a different story. When Grammarly composes, rewrites, or expands a passage for you, it is generating machine-written prose, and Turnitin treats that output the same way it treats text from ChatGPT, Claude, or other large language models [2]. A paragraph that Grammarly fully rewrote can therefore appear in the AI writing report as AI-generated.
In practice, students who generate an entire essay with AI and then run it through Grammarly for "polish" usually find the flag still there. Grammarly's edits are mostly stylistic, while Turnitin's detector evaluates whole passages for AI-like uniformity in structure, rhythm, and word choice. Editing the surface without restructuring the underlying AI prose rarely changes the outcome.
Why Can Grammarly-Polished AI Text Still Return a High Turnitin AI Score?
Because polishing and generating are fundamentally different activities. Turnitin's AI writing detection is trained on the linguistic patterns of machine-generated text — predictable sentence flow, uniform tone, and formulaic transitions [3]. Fixing grammar mistakes does not alter those underlying patterns; it only makes the surface cleaner.
A detector like Turnitin's also evaluates longer stretches of text rather than isolated sentences [3]. Even if Grammarly corrects every verb tense and comma splice in an AI-written paragraph, the paragraph still reads as machine-generated at the passage level, which is why the AI percentage can stay high after a full Grammarly pass.
The same logic explains why lightly paraphrasing with Grammarly is unreliable. Rewriting a few phrases shifts the wording but often preserves the tell-tale rhythm of AI prose, and detection methods are updated over time to catch common rewrite patterns. If you want a score that actually drops, the text itself has to be substantially rebuilt — not just cleaned up.
What Is the Most Reliable Way to Lower a Turnitin AI Score Before Submission?
Start by seeing exactly what an instructor would see. AI scores reported by different tools vary, so guessing with a free checker can mislead you; a pre-submission Turnitin report shows the same AI percentage and similarity summary that appears in your institution's system [4]. Once you know which passages are flagged, you can target your revision instead of rewriting the whole paper blindly.
For flagged sections, rewrite at the structural level: break up uniform sentence patterns, add your own examples and analysis, and remove generic AI phrasing. For essays that are largely AI-written, editing alone is slow and error-prone, which is why a dedicated humanizer is designed to rewrite flagged prose while preserving meaning, academic quality, and formatting [4].
Whatever method you choose, re-check after revising. A reliable workflow is to humanize the text, run a fresh Turnitin report, and repeat until the AI score shows the lowest band before you submit.
Grammarly is a great editing companion, but it was never built to move a Turnitin AI score — that takes rewriting that changes how your prose reads at the pattern level. That is exactly what turnitin0's AI humanizer is designed to do: it rewrites AI-sounding text into natural academic writing while preserving your meaning and formatting, so you can re-check and submit with confidence.
※ Turnitin0.com - AI Humanizer Bypassing Turnitin AI Detector
FAQ
Does Grammarly claim to bypass Turnitin AI detection?
No. Grammarly positions itself as a writing assistant that improves clarity and grammar; it does not advertise or guarantee that its output evades Turnitin's AI detector [1].
Will Turnitin flag text written with Grammarly's generative AI?
It can. Prose composed or fully rewritten by Grammarly's generative features is machine-generated text, and Turnitin's AI writing report can identify it as such [2].
Can I paraphrase with Grammarly to reduce my AI score?
Not reliably. Light paraphrasing preserves the passage-level patterns Turnitin evaluates, so the AI percentage often stays high after a Grammarly pass [3].
How can I see my real Turnitin AI score before I submit?
Use a checking service that delivers the same Turnitin AI writing and similarity reports instructors see, then revise flagged passages before submitting [4].
What AI score is considered safe to submit?
Any score below 20% displays as *% in Turnitin's AI writing report, and 0% is the only explicit low number students typically see — that is the target most students aim for before submitting.