Can Turnitin detect an AI humanizer?
Partly
Sometimes. This is an arms race with no stable answer, and any tool promising a guaranteed pass is making a claim it cannot support.
How it works
Humanizers add variance: longer and shorter sentences, less common word choices, small irregularities. That lowers the score on detectors tuned to smoothness. Detectors then retrain on humanizer output, and the advantage decays.
The part people miss
Nobody can honestly guarantee a result here, ourselves included. Treat 'undetectable' marketing as a red flag, not a feature.
Flagged for something you wrote yourself?
There is a right order to handle it in, and editing the document first destroys your best evidence.