AI Detector

Make AI text read
naturally for Copyleaks.

Q: Does Copyleaks detect paraphrased text?

Copyleaks markets the ability to catch paraphrased and reworded content, so simple word-swapping is increasingly caught. A quality rewrite that changes rhythm and structure reads more naturally, but no tool can guarantee passing.

Q: Is Copyleaks accurate?

Copyleaks reports likelihoods, not certainties, and independent reporting shows false positives are still possible across languages. No Copyleaks result should be treated as definitive proof that text was AI-generated.

Copyleaks is an enterprise and education platform that pairs AI detection with plagiarism checking and integrates into learning-management systems via its API. Here's how its detection 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 Copyleaks works

Copyleaks runs text through an AI-detection model and returns an AI-likelihood result, with multi-language support and a separate plagiarism scan. It is built for scale, with LMS and API integrations so schools and businesses can check submissions automatically. The result reflects how likely its model believes the text was machine-generated.

False positives

Copyleaks promotes multilingual coverage and the ability to catch paraphrased text, but independent reporting shows false positives remain possible on genuinely human writing. As with every detector, treat any single result 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 Copyleaks or any specific detector — their models change frequently 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 Copyleaks.

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.

Humanize free now

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FAQ

Copyleaks questions, answered.

Can Copyleaks detect ChatGPT?

Copyleaks is built to estimate whether text was generated by ChatGPT and similar models and returns an AI-likelihood result. Its accuracy is contested and false positives are documented, so treat the result as a signal rather than proof.

Does Copyleaks detect paraphrased text?

Is Copyleaks accurate?

How Copyleaks works

False positives

What a rewrite actually looks like

Humanize your text.Right here, right now.

Humanize free — then get the app

Copyleaks questions, answered.

Related guides.

Humanize your text.
Right here, right now.