AI Paraphrase Checker

Signs of paraphrased AI text

Unusual synonyms (“azure sky” for “blue sky” throughout), awkward idioms, inconsistent register, and the familiar AI outline of claim–support–summary hiding under unfamiliar vocabulary.

No AI detector is 100% accurate. Results are probabilistic estimates and should never be used as the only evidence that someone used AI. Treat them as one signal alongside drafts, revision history, and a conversation with the writer.

How paraphrasing hides AI text

Paraphrasing and “humanizer” tools swap words and reorder clauses, which disrupts the surface patterns many detectors rely on. What often survives is the structure underneath: the same claim–support–summary paragraph shape, evenly balanced arguments and a lack of specific, verifiable detail.

Automated rewording also leaves its own traces: unusual synonym choices, idioms that are slightly wrong, a register that jumps between casual and formal, and phrases that are grammatically correct but that no fluent writer would choose.

Signals the checker looks for

Odd or overly fancy synonyms for common words (“utilize,” “commence,” “individuals”), stock AI phrases that survived the rewording, frequent transition words at the start of sentences, sentences that are unnaturally similar in length, and a lack of specific names, numbers and dates. Broken collocations such as “create a decision” are worth noticing yourself, since the checker does not test word combinations.

Interpreting results fairly

The same traits appear in writing by non-native English speakers, in text run through translation, and in work by writers who lean heavily on a thesaurus. A flag is a reason to look closer and talk to the writer, not a conclusion. Results include a confidence level that drops when the evidence is weak or mixed.