Most AI detectors struggle to reliably detect paraphrased text. When AI-generated content is manually reworded or run through a paraphrasing tool, the original statistical patterns that detectors rely on, like predictable word choices and uniform sentence length, get disrupted, making detection significantly harder. However, light paraphrasing (swapping a few synonyms) is often still detectable because the underlying sentence structure remains AI-like. Heavy paraphrasing that restructures sentences and adds original thought is much harder for any detector to catch. To learn more about how detection technology works, see our guide What Is an AI Detector? How It Works, Accuracy, and Best Tools. Quetext's AI Detector uses deep analysis that goes beyond surface-level pattern matching to identify AI-generated content even after light edits.