Free AI Content Detector

The AI Content Detector is a free online tool that analyze text for ai-generated patterns using sentence length variance, vocabulary diversity (ttr), passive voice ratio, transition word density, and repetitive phrase detection.. It runs entirely in your browser with no installation or sign-up needed.

It analyzes 5 statistical patterns: sentence length variance, type-token ratio, passive voice ratio, transition word density, and repetitive AI phrase count. A weighted score produces the final AI probability.

No — this is a heuristic analysis based on statistical patterns. It should not be used as sole evidence in any formal context.

A minimum of 100 words is recommended for reliable results. More text = higher confidence.

Yes, the AI Content Detector is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The AI Content Detector processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the AI Content Detector is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the AI Content Detector in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The AI Content Detector works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Yes. No detector can prove authorship, and false positives are common. Because this tool scores statistical patterns rather than meaning, careful human writing that happens to be formal, uniform in sentence length, and heavy on passive voice or transition words can read as AI-like — academic prose, legal text, and translated writing are frequent offenders. The reverse also happens: lightly edited machine text that varies its rhythm can slip under the threshold. A 40 to 69% "Possibly AI-Assisted" result is the tool flagging exactly this ambiguity. That is why the score should inform a conversation, never settle one, and should never be sole evidence in a grading or disciplinary decision. Run your text here to see the score plus a pattern-by-pattern breakdown, so you understand why it landed where it did rather than trusting a single number.

Formal writing shares the surface fingerprints this detector measures. It tends to use even, measured sentence lengths, which lowers sentence-length variance — and low variance is a strong AI signal. It also leans on passive constructions like "was completed" or "is considered," plus connectors such as "however," "furthermore," and "moreover," both of which models overuse. Stock phrases like "it is important to note" push the repetitive-phrase signal higher too. Because the tool reads style rather than intent, a polished human report can trip the same triggers as ChatGPT output. To read more human, vary sentence length, convert passive voice to active, swap formal transitions for casual ones like "also" or "but," and add contractions or first-person perspective. Paste your draft here and the tool labels each of the five signals Human-like, Mixed, or AI-like so you can target the exact fixes.

This detector returns an AI probability from 0 to 100% and maps it to three plain-English verdicts. A score of 70% or higher reads as "Likely AI-Generated," 40 to 69% as "Possibly AI-Assisted" — often human text edited by a model, or the reverse — and below 40% as "Likely Human-Written." The number is a weighted blend of five signals: sentence length variance (25%), vocabulary diversity or TTR (20%), passive voice (20%), transition density (20%), and repetitive AI phrases (15%). Treat the bands as ranges of suspicion, not hard proof: a 72% does not mean 72% of the text is AI, only that the patterns lean machine-like. The middle band is deliberately cautious. Run your text here to get the score, the verdict, and a confidence rating based on how much text you supplied.

Target the five signals this tool measures. First, vary your sentence length — mix short punchy lines with longer ones to raise variance, since uniform pacing is the biggest AI tell. Second, convert passive voice ("the report was written") to active ("I wrote the report"). Third, cut formal connectors like "however," "furthermore," and "moreover," replacing them with casual equivalents such as "but," "also," and "and." Fourth, delete stock filler like "it is important to note," "plays a crucial role," and "in conclusion." Fifth, add contractions, a first-person voice, and specific concrete details, which naturally diversify your vocabulary. The detector flags up to five specific sentences with the reason each stood out, giving you an editing checklist. Paste your draft, apply the highlighted fixes, then re-run it to confirm the score and pattern breakdown have shifted toward Human-like.

More text means a more reliable reading, because the statistical patterns need room to show themselves. This tool requires at least 50 words to run at all and recommends 100 or more for a meaningful result. The confidence rating reflects exactly this: under 150 words returns Low confidence, 150 to 300 words returns Medium, and more than 300 words returns High. With a short snippet, a single passive sentence or one formal transition can swing the percentage dramatically, so brief samples are noisy and easy to misread. For the steadiest signal, give the detector a few hundred words of continuous prose rather than a headline or a single paragraph. Paste a longer passage here and the tool reports both the AI probability and the confidence level, so you know how much weight the result deserves before acting on it.