Paste your text to get an AI probability score and see which sentences read as machine-written. Free, no sign-up.
AI Probability Index
Input custom documentation metrics inside the viewport to fetch detailed probabilistic scores.
Linguistic Flags
Rewrite stiff, flagged sentences into natural, readable writing with our AI humanizer. Helpful when your own writing gets a false positive.
AI writing tools pick the most likely next word again and again, which leaves patterns in the text: very even sentence lengths, predictable word choices, smooth but generic transitions and few personal details. Our detector analyzes those patterns across your whole text and estimates how likely it is that a language model produced it.
You get two kinds of results. The AI probability score summarizes the whole text, and the linguistic flags point to specific sentences that look most machine-written, so you know exactly where to look.
A score is a probability, not a verdict. Use it to decide where to edit, and never as the only evidence that someone used AI.
False positives are common across every AI detector. Formal academic writing, technical documentation, lists, very short texts and writing by non-native English speakers can all look "too regular" to a detector. Text polished with grammar tools can also score higher than the original draft.
If your own work is flagged, add specific examples, vary your sentence length and replace generic phrases with your own wording. Our guide on why AI detectors flag your writing covers the most common causes, and is Turnitin accurate? explains how school detectors differ.
When a section is flagged, the fix is usually clearer writing, not tricks. Send the text to our AI humanizer with the Rewrite Now button, compare the new version with your original, then add your own details and run the detector again.
Yes. You can check text for free with no sign-up. Paste your text or upload a .txt file and click Analyze Content.
No AI detector is 100% accurate, including ours. Scores are estimates based on writing patterns, so short texts, formal writing and non-native English can produce false positives. Treat the result as a signal to review, not as proof.
It looks for patterns common to large language models in general rather than one specific tool, so it can flag text from ChatGPT, Claude, Gemini and similar models. Heavily edited AI text is harder for any detector to judge.
No. Schools often use Turnitin, GPTZero or a detector built into their learning platform, and each one uses its own model. Different detectors can give very different scores for the same text.
Longer samples give more reliable results. Aim for at least a few paragraphs (150 words or more); a single sentence doesn't give the detector enough to work with.
No. Your text is sent securely to our detection provider for analysis and is not saved on our servers.