Free AI detector
Free AI Detector
Paste text and check whether it may be AI-generated. Use the score as a signal, not proof.
AI detection is probabilistic. Results can be wrong, especially for short text, heavily edited text, translated text, or highly formal writing. Do not use AI scores as the only evidence for academic or workplace decisions.
What it checks
Sentence predictability, repetition, generic transitions, variation, and other writing signals that may point toward AI-assisted text.
How to use the score
Treat the result as a second-opinion review signal. Ask for context, sources, notes, or revision history before making decisions.
Common use cases
Teachers, editors, students, and businesses can use the report to review drafts, submissions, outsourced content, and transparency concerns.
Limitations
AI scores are not final proof
False positives and false negatives are possible. A careful review should combine detector output with context: assignment drafts, source notes, edit history, author explanation, and whether the writing style matches prior work.
AI detector FAQ
Is this AI detector free?+
Yes. You can paste text and run a limited number of free checks. Signed-in accounts can save recent check history and see usage limits.
Can AI Checker Lab prove that text was written by AI?+
No. AI detection is probabilistic. Treat the result as a review signal, not proof of authorship or a reason to punish someone by itself.
What does the detector look for?+
It reviews patterns such as repetitive phrasing, predictable sentence flow, generic transitions, low variation, and human counter-signals.
Why can AI detectors be wrong?+
Short text, translated writing, formal essays, edited drafts, non-native writing, and template-like human writing can cause false positives or false negatives.