Can QuillBot Humanize AI Text? We Tested It
QuillBot paraphrases. It does not humanize.
We see this question on Reddit and student forums constantly. People assume that paraphrasing AI text will make it undetectable. It does not, and our tests prove it.
Test results
We paraphrased 2,000 words of ChatGPT-4o output using QuillBot Premium on all available modes.
| QuillBot Mode | Turnitin Score | GPTZero Score |
|---|---|---|
| Standard | 87% AI | 83% AI |
| Fluency | 84% AI | 79% AI |
| Creative | 72% AI | 68% AI |
| Academic | 81% AI | 76% AI |
The Creative mode came closest, but 72% on Turnitin still means your professor sees a clear AI flag.
Why paraphrasing fails
QuillBot replaces words with synonyms and rearranges clause order. But detectors measure patterns much deeper than word choice. They measure how predictable your overall text is at a mathematical level.
Swapping "important" for "significant" does not change the underlying rhythm of the text. The sentences are still the same length, the transitions still appear in the same places, and the overall statistical signature stays AI-shaped.
What does work
Tools that reconstruct sentences from the ground up — changing not just words but entire structural patterns. Humanize AI Pro reduced the same 2,000-word text to 2% on Turnitin, compared to QuillBot's 72% on its best mode.
If you already have a QuillBot subscription, it is a useful grammar and clarity tool. But for AI detection bypass, you need something else entirely.
Dr. Sarah Chen
AI Content Specialist
Ph.D. in Computational Linguistics, Stanford University
10+ years in AI and NLP research