Paraphrasing
Updated June 10, 2026
Restating text in different words — useful for many things, and famously insufficient against AI detectors.
Definition
Paraphrasing expresses the same meaning in different words: synonym substitution, light clause reordering, voice changes. Tools like QuillBot industrialized it. Legitimate uses are everywhere — avoiding quotation overload, simplifying jargon, restating sources (with citation; uncited paraphrase of someone's ideas is still plagiarism).
Why it fails against detectors
Paraphrasing changes vocabulary; detectors measure structure — sentence shapes, rhythm, predictability. Swap "utilize" for "use" in a machine-shaped sentence and you have a machine-shaped sentence. Turnitin states it specifically targets AI-paraphrased text, and QuillBot's own detector catches mechanically paraphrased output — the company that built the paraphraser knows its signature best.
Paraphrasing vs. humanizing
The distinction is the layer touched: paraphrasing re-skins sentences; humanizing rebuilds them — new rhythm, new structure, higher burstiness — while preserving facts. The practical test is measurement: paraphrase output and check the score; restructure and check again. The numbers tell you which layer you changed.