Free AI Content Detector

How to use this the ai content detector

1. 1

   Paste your text

   Copy your content (minimum 50 words) and paste it into the text box above. Longer texts produce more reliable results.

2. 2

   Click Analyze

   Hit the Analyze button. The tool runs 8 statistical tests on your text entirely in your browser. Nothing is sent to a server.

3. 3

   Review AI probability and signal breakdown

   Check your overall AI probability score and the individual breakdown across all 8 signals: vocabulary diversity, sentence variance, burstiness, word rarity, repeated phrases, AI filler phrases, paragraph uniformity, and sentence starters.

How AI content detection works

AI language models like ChatGPT, Claude, and Gemini produce text with measurable statistical patterns. According to research from Stanford HAI, AI detection tools achieve 70-85% accuracy on longer texts, because these patterns become more statistically significant with more data. The patterns emerge because LLMs predict the most likely next token at each step, which leads to predictable vocabulary choices, uniform sentence structures, and repetitive transitions. Human writers, by contrast, produce text with more variation, unexpected word choices, and uneven rhythms.

This tool analyzes 8 independent signals: vocabulary diversity, sentence length variance, burstiness, word rarity, repeated phrases, known AI filler phrases, paragraph uniformity, and sentence starter diversity. Each signal produces a 0-100 AI likelihood score. The weighted combination of all 8 signals gives the overall probability estimate.

No single signal is definitive. A low vocabulary diversity score could mean AI-generated text, or it could mean a focused technical article with domain-specific terminology. The combined analysis across all 8 dimensions provides a more reliable estimate than any single metric alone.

All analysis runs entirely in your browser. Your text is never sent to any server, making this tool completely private.

What this tool detects

Each of the 8 signals targets a specific statistical property that differs between AI and human writing.

Limitations of AI detection

• No detector is 100% accurate. This applies to all AI detection tools, including commercial products like GPTZero and Originality.ai. False positives and false negatives are unavoidable with current technology.
• Edited AI content is harder to detect. A 2024 study by Originality.ai found that heavily edited AI content reduces detection accuracy to below 50%. When humans rewrite sentences, add personal examples, and vary structure, the statistical patterns shift toward human norms. A well-edited AI article may score as human-written.
• Formal writing triggers false positives. Academic papers, legal documents, and technical manuals share some statistical properties with AI output: formal tone, consistent structure, predictable vocabulary. These will sometimes score higher than expected.
• Statistical heuristics, not machine learning. This tool uses rule-based statistical analysis, not a trained neural classifier. It is faster and more private (no server calls), but less accurate than tools that use trained models on large datasets.
• Use results as one data point. Never use any AI detector as the sole basis for academic integrity decisions, content rejection, or employment judgments. Treat the score as an indicator, not proof.

How to make AI content sound more human

If your AI-generated content scores high on detection tools, these specific changes target the signals that detectors look for.

• Vary sentence lengths deliberately. Mix short punchy sentences with longer explanations. Drop in a two-word sentence. Then follow it with something that stretches across 30 words. This disrupts the uniform cadence that AI detectors flag.
• Add specific examples and personal experience. AI writes in generalities. Replace "many businesses struggle with SEO" with "we spent 6 months ranking our first blog post for a keyword with 2,400 monthly searches." Specificity is the strongest human signal.
• Remove AI filler phrases. Search your text for "it's important to note", "in today's landscape", "delve into", "furthermore", and "moreover". Delete them. These phrases add no meaning and are immediate AI tells.
• Take positions instead of hedging. AI hedges constantly: "it can be argued that", "there are various perspectives". Humans have opinions. Say "this approach is wrong because" or "the best option is X."
• Use contractions naturally. Write "don't" instead of "do not", "won't" instead of "will not", "can't" instead of "cannot." AI models default to formal uncontracted forms. Contractions shift the text toward conversational human patterns.
• Break formulaic paragraph structures. AI typically writes 3-5 sentence paragraphs of similar length. Mix it up. Write a one-sentence paragraph for impact. Follow with a dense 8-sentence paragraph. Structural variety signals human authorship.