AI Detector: Check If Your Text Is AI-Generated
Instantly detect AI-written content with our AI content detector. Paste any text to check if it was written by ChatGPT, Claude, Gemini, or other AI writing tools. Get detailed analysis with the same accuracy as GPTZero and Turnitin.
Results vary by text type. Review output before use.
How Our AI Writing Detector Analyzes Your Text
Perplexity Analysis
Measures how predictable your text is, the core method used by GPTZero. AI-generated text from ChatGPT and Claude has low perplexity (high predictability), while human writing is more varied and surprising.
Burstiness Detection
Analyzes sentence length variation. Human writers naturally create 'bursts', mixing short punchy sentences with longer complex ones. AI writing tools produce unnaturally uniform sentence patterns.
Readability Scoring
AI tools like ChatGPT produce text locked in a narrow readability range (Grade 8-10). Our AI detector flags content with suspiciously consistent readability scores that indicate machine generation.
AI Fingerprint Detection
Identifies tell-tale ChatGPT patterns: overused transitions ('Furthermore', 'Moreover', 'Additionally'), generic openers, and repetitive n-gram sequences that reveal AI authorship.
Why Choose Our AI Detector Over GPTZero?
See why thousands of users prefer our AI content detector over expensive alternatives like GPTZero and Originality.ai.
| Feature | HumanizerAI | GPTZero | Originality.ai |
|---|---|---|---|
| AI detection included | |||
| 6 detailed metrics breakdown | |||
| Sentence-level AI highlighting | |||
| Built-in AI humanizer tool | |||
| Developer API access | |||
| No watermarks or usage caps |
Who Uses Our AI Content Detector?
Students & Academics
Check your essays and papers before submitting to Turnitin. Ensure your AI-assisted research and writing won't get flagged or penalized.
Content Writers & Bloggers
Verify your articles pass AI detection before publishing. Google's helpful content update may demote detectable AI content in search rankings.
Educators & Institutions
Screen student submissions for AI-generated content. Quickly identify ChatGPT, Claude, and other AI tool usage in academic work.
How AI Detection Works in Detail
Understanding detection mechanisms helps you better interpret results from our AI checker and improve your writing.
Perplexity and Text Predictability
Perplexity measures how predictable the next word in a text is. Language models like ChatGPT, Claude, and Gemini generate statistically 'smooth' text: each word follows logically from the previous one. Human writing is more unpredictable, with unexpected word choices, digressions, and personal turns of phrase. Our AI detector calculates a perplexity score for each sentence and identifies passages where predictability is abnormally low, a typical sign of automated generation.
Burstiness and Sentence Rhythm
Humans naturally write with rhythm variations: a short sentence followed by a long one, a dense paragraph then an idea expressed in just a few words. This phenomenon is called 'burstiness.' AI tools produce text with remarkably uniform sentence lengths, often between 15 and 25 words per sentence. Our AI detector analyzes this distribution and flags text whose rhythm is too regular to be human.
AI Detection Limitations: What You Should Know
No AI detector is 100% reliable. The best tools (GPTZero, Turnitin, HumanizerAI) achieve between 90 and 95% accuracy depending on language and text length. False positives exist: highly technical or academic text may be wrongly flagged as AI. Use results as an indicator, not an absolute verdict. For important decisions (academic work, publishing), combine our AI checker with your own judgment.
Prepare Your Text Before Turnitin
Turnitin now includes AI detection in its similarity reports. Here's how to check your work before submitting.
Analyze your text
Paste your essay or paper into our AI detector. You'll get an overall score and sentence-by-sentence highlighting identifying passages detected as AI.
Identify flagged passages
Our tool highlights sentences with a high AI score. Focus on these passages: they're the ones Turnitin will also flag for your professor.
Humanize or rewrite
Use our AI humanizer to transform flagged passages into natural writing that passes Turnitin, or rewrite them manually adding your personal voice.
Detecting Mistral and French AI Models
Mistral AI is the leading model in France, used by millions via Le Chat, Mistral Large, and Mistral Small. Our AI detector is optimized to identify Mistral-specific writing patterns: characteristic phrasing, consistent formality level, and typical argumentative structures of French models.
Whether your text was generated by Mistral Le Chat, ChatGPT, Claude, or Gemini, our AI checker analyzes the same universal statistical signals. Detection works in English, French, and all major languages, because AI writing patterns transcend the language used.
AI Detector for SEO and Content Marketing
Google regularly updates its algorithms to detect and demote low-quality AI-generated content. The 'Helpful Content' update penalizes sites that mass-publish automated content with no added value. For content writers and SEO specialists, checking your content with an AI detector before publishing has become essential.
Our tool lets you identify passages in your articles that sound too 'AI' and risk being detected by Google. Use the AI detector, then the built-in humanizer to transform those passages into natural text. The result: SEO content that ranks well while remaining authentic and engaging for your readers.
AI Detector FAQ
What is an AI detector and how does it work?
An AI detector (also called AI content detector or AI writing detector) analyzes text to determine if it was written by AI tools like ChatGPT, Claude, or Gemini. It works by measuring statistical patterns including perplexity (predictability), burstiness (sentence variation), and identifying AI-specific writing fingerprints that human writers don't produce.
How accurate is this free AI detector?
Our AI detector uses the same detection methods as GPTZero and Turnitin, analyzing perplexity, burstiness, readability, and pattern recognition. It accurately identifies AI-generated content from ChatGPT, Claude, Gemini, and other AI writing tools with results comparable to paid alternatives.
How does the AI detector work?
Our AI detector analyzes text using the same methods as GPTZero and Turnitin: perplexity, burstiness, and pattern detection. Sign up to access detection and humanization features.
Can I detect AI text from ChatGPT and Claude?
Absolutely. Our AI detector works with all major AI writing tools including ChatGPT (GPT-4, GPT-4o), Claude (Claude 3, Claude 3.5), Google Gemini, Jasper, Copy.ai, and any other AI text generator. Simply paste your text to check if it's AI-generated.
What should I do if my text is detected as AI?
If our AI detector flags your text as AI-generated, you can use our AI humanizer to rewrite it. The humanizer transforms AI content into natural, human-like writing that passes GPTZero, Turnitin, and other detection tools while preserving your original meaning.
How is this different from GPTZero?
Unlike GPTZero, our AI detector is included with all plans. Plus, we include a built-in AI humanizer so you can fix any detected AI content instantly, something GPTZero doesn't offer.
Does the AI detector work with Mistral and other models?
Yes, our AI detector detects content generated by Mistral (Le Chat, Mistral Large, Mistral Small), as well as all other major models including ChatGPT, Claude, and Gemini. Our tool analyzes universal statistical patterns of AI writing for reliable detection regardless of the model used.
How do I humanize text that's detected as AI?
If our detector flags your text as AI-generated, simply click the button to humanize it. Our rewriting tool transforms AI content into natural, human text that bypasses GPTZero, Turnitin, and all major detectors. HumanizerAI is the only tool that combines detection and humanization in one place.
Is the AI detector free to use?
Our AI detector is available for free with a number of checks included in every plan. Create an account in seconds to start analyzing your texts. No credit card required to get started.
What's the difference between an AI detector and a plagiarism checker?
An AI detector analyzes statistical patterns in text (perplexity, burstiness, sentence structure) to determine if content was generated by artificial intelligence. A plagiarism checker compares your text against existing databases to find matches. Both tools are complementary: plagiarism checks for copying, AI detection checks for automated generation.