AI Text Detector
Analyze any text and detect whether it was written by AI or a human. Runs entirely in your browser.
How to use AI Text Detector
Paste or type the text you want to analyze - minimum 100 characters
Click Analyze Text to start the detection
On first use the AI model downloads to your browser - this takes 10 to 30 seconds and only happens once
Review your result - the percentage shows how likely the text is AI-generated
Read the confidence disclaimer before drawing any conclusions
Privacy note: The AI model runs entirely in your browser using WebAssembly. Your text is never sent to any server, ensuring 100% privacy.
Deep Dive & Guides
As Large Language Models (LLMs) become more sophisticated, the line between human writing and machine generation is blurring. Whether you are an educator checking for academic integrity, a recruiter reviewing cover letters, or a content editor ensuring brand authenticity, an AI text detector is an essential tool for maintaining the value of human creativity.
The challenge with AI detection is that it is probabilistic, not definitive. Machines don't leave "watermarks" in text; instead, they leave patterns of predictability and consistency that differ from natural human thought. ReverseToolkit provides a sophisticated detector that runs entirely on your device, using a powerful model to analyze text for AI-specific markers while ensuring your content remains 100% private.
This guide explores how AI detection works, the limitations of current technology, and how to interpret detection scores fairly and accurately.
AI models like ChatGPT predict the "next most likely word" in a sequence. This leads to text that is often very "safe," grammatically perfect, and statistically predictable. Detectors analyze two primary metrics to identify this machine-like quality.
Perplexity: This measures how "surprised" a model is by the text. Human writing is often highly unpredictable, using unique metaphors and varying sentence structures. AI writing has low perplexity; it follows the most common paths of language, making it feel "flat" or "standardized."
Burstiness: This refers to the variation in sentence length and structure. Humans tend to write in "bursts" - a long, complex sentence followed by a short, punchy one. AI models often generate sentences of a consistent, middle-range length, leading to a rhythmic monotony that detectors can identify.
Is AI detection 100% accurate?
No. It is important to view detection as a "smoke detector," not a "DNA test." High-quality human writing can sometimes be flagged as AI if it is very formal or technical. Conversely, AI text can be "humanized" to bypass detectors. Always use detection results as one part of a broader human evaluation.
To get the most reliable results from our AI Text Detector, follow these professional guidelines.
- Use enough text. Detection requires at least 250 characters to find meaningful patterns. For the best accuracy, provide 500 to 1,000 words.
- Analyze original drafts. If you analyze text that has already been heavily edited by a human or a tool like Grammarly, the detection score will be less reliable.
- Consider the context. Technical documentation, legal briefs, and scientific abstracts are naturally more "predictable" and may receive higher AI scores even when written by humans.
- Don't rely on a single score. If you suspect AI use in a high-stakes environment, look for other markers like factual hallucinations or a lack of personal voice and specific anecdotes.
Can this tool detect Claude and Gemini?
Yes. While each model has its own "fingerprint," they all share the fundamental characteristics of transformer-based LLMs. Our detector is trained to recognize the general statistical markers of machine-generated text regardless of the specific model used.
Is my text safe during analysis?
Yes. Privacy is a core feature of ReverseToolkit. Unlike other detectors that send your text to their servers (and potentially use it to train future models), our analysis happens entirely on your device. Your text never leaves your browser.
What does a "high probability" score mean?
A high score indicates that the text has the statistical markers common in AI writing. It is not a definitive proof of "cheating." We recommend using high scores as a starting point for a conversation or a more detailed review, rather than a final verdict.
Maintain the value of human insight. Check your content with the ReverseToolkit AI Text Detector. It's the most private and powerful way to identify machine-generated text.