AI Detector

Make AI text read
naturally for Turnitin.

Q: Does Turnitin detect humanized or paraphrased text?

Turnitin has said it targets paraphrased and humanized text. Simple word-swapping is increasingly caught; a quality rewrite that changes rhythm and structure reads more naturally, but no tool can guarantee passing.

Q: Why was my own writing flagged as AI by Turnitin?

AI detectors flag low-perplexity writing, and research shows non-native English writers are flagged more often because their constructions are simpler. A false positive does not mean you cheated.

Turnitin added AI-writing detection to its similarity report in 2023; it now also flags text that has been run through paraphrasers and "humanizers." Here's how it actually works, what its false-positive record looks like, and the honest version of what a humanizer can and can't do about it.

How Turnitin works

Turnitin segments a document and scores each segment on how predictable its word choices and sentence rhythm are to a language model — low "perplexity" and low "burstiness" read as machine-written. It reports a percentage of the document it believes is AI-generated. It does not show its evidence, and it updates its model over time, so the same text can score differently month to month.

False positives

Turnitin has publicly acknowledged false positives, and independent research (Stanford, 2023) found AI detectors disproportionately flag non-native English writers, whose simpler constructions read as low-perplexity. Treat any single score as a signal, not a verdict.

Where we stand We measure every rewrite against Sapling's AI detector and show you the score, so you can see how natural the output reads. We do not claim to pass Turnitin or any specific detector — their models change weekly and no humanizer can guarantee passage at every moment. What Humanizer does is rewrite the rhythm, word choice, and structure that detectors key on, and let you match your own voice.

What a rewrite actually looks like

Here's the same paragraph before and after Humanizer — the structure, rhythm, and word choice change, not just a few swapped synonyms. The percentage is Sapling's AI-likelihood estimate, shown on every rewrite. It's a signal, not a guarantee against Turnitin.

Humanizer — Humanize

AI-generated input

96^% AI

AI has become an integral part of modern content creation. With the advent of large language models, the ability to generate high-quality text has been revolutionized, allowing for unprecedented efficiency in writing workflows.

Humanized — Academic

11^% AI

Recent advances in large language models have genuinely reshaped how people write. What used to take days of drafting can now happen in an afternoon — though how much it helps still depends on the field, and we're all figuring out the limits.

Before/after on a sample paragraph. Scores are Sapling estimates and will vary by text — Humanizer never promises a clean pass on any detector.

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Humanize your text.
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Paste up to 1,500 characters, pick a mode, and get a real rewrite with an AI-detector score. No account, no card.

Or try a sample:

Your text0 / 1,500

Humanized — Casual

Your rewrite will appear here.

Free tool runs Claude Haiku, one pass. Pro (app & web) uses the stronger model with a detector-guided retry loop, longer text, and unlimited rewrites.

Humanize free — then get the app

Try the rewriter right here, no signup. Get the native Mac & iPhone app for unlimited rewrites, longer text, and the stronger model.

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FAQ

Turnitin questions, answered.

Can Turnitin detect ChatGPT?

Turnitin claims to detect text generated by ChatGPT and similar models by scoring how predictable the writing is. Its accuracy is contested and it has acknowledged false positives, so treat the score as a signal rather than proof.

Does Turnitin detect humanized or paraphrased text?

Why was my own writing flagged as AI by Turnitin?

How Turnitin works

False positives

What a rewrite actually looks like

Humanize your text.Right here, right now.

Humanize free — then get the app

Turnitin questions, answered.

Related guides.

Humanize your text.
Right here, right now.