Check if text was written by ChatGPT, Claude, or other AI tools. Free detection with no word limits.
Copy the full text — the more text you provide, the more accurate the detection. At least 250 words is recommended.
Our detector analyzes patterns including perplexity, burstiness, sentence structure variation, and vocabulary diversity.
The tool gives an overall probability plus sentence-level highlights. Focus on patterns, not individual sentences.
Look at which specific sentences are flagged as likely AI-generated. These often have lower perplexity (more predictable word choices).
If your own writing is flagged, add personal anecdotes, vary sentence length dramatically, and use specific examples that only a human would know.
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Detect AI Content Now — Free →⭐ Below 70% AI probability is often a false positive, especially for non-native English speakers whose writing tends to be more uniform. Don't confront a student based on 60% alone.
🎯 The most tell-tale sign of AI writing isn't any single sentence — it's consistent sentence length. Humans naturally vary between 5-word and 30-word sentences; AI tends to hover around 15-20.
🔑 If your own human-written text gets flagged: add a personal story, use a contrarian opinion, or reference a specific date/event. These are hard for AI to replicate naturally.