Make AI text read
naturally for Grammarly AI Detector.
Grammarly, the widely used writing assistant, has added an AI-detection feature that estimates how much of a document may have been generated by AI. Here's how that scoring 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 Grammarly AI Detector works
Grammarly's AI detector estimates the share of a document that appears to have been produced by a large language model such as ChatGPT, Claude, or Gemini, reporting a percentage rather than a hard yes-or-no. Like other detectors it reads statistical regularity — how predictable the word choices are and how evenly the sentences are paced. Text that is consistently predictable and uniform reads as machine-written, while human writing tends to be more varied.
False positives
Grammarly's estimate is probabilistic, not proof, and AI detectors broadly misfire on real human writing. False positives cluster on formulaic, simple, or non-native and ESL English, whose low perplexity and steady cadence resemble AI output. A high AI percentage is a signal, not a verdict — treat any single score that way.
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 Grammarly AI Detector.
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.
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.
Humanize your text.
Right here, right now.
Paste up to 1,500 characters, pick a mode, and get a real rewrite with an AI-detector score. No account, no card.
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.