Is this text AI-generated?
Paste any passage — article, email, essay, message — and get a verdict in under a second. Works on GPT, Claude, Gemini, Llama, and most open-weight LLMs.
- · Privacy mode on by default — text never stored
- · Three depths of analysis: low (fast) → high (most accurate)
- · Best on passages of 250+ words
How the text detector works
Every LLM leaves a statistical fingerprint. Token probabilities, n-gram distributions, punctuation rhythm, and stylometric variance all differ between human prose and machine-generated output. We combine these signals with model-specific features to attribute a passage to AI or human origin.
The `depth` control changes how much reasoning we apply: low for fast triage, high for forensic-quality analysis on disputed text.
Where this detector falls short
No text detector is 100%. Short passages (under 50 words), non-English text, heavily edited AI output, and domain-specific jargon (legal, medical, code) are all harder. For high-stakes decisions, treat the score as one input alongside context and human judgment — never the only one.
Frequently asked questions
- How accurate is the text detector?
- Accuracy scales with passage length. On 250+ word samples we observe >95% accuracy across major LLM families. Short passages (under 50 words) are genuinely hard for any detector — treat them as inconclusive.
- Which LLMs does it catch?
- GPT (OpenAI), Claude (Anthropic), Gemini (Google), Llama (Meta), plus most open-weight derivatives. It also flags light human-edited AI output — full rewrites are harder.
- Is my text stored?
- No. detectdeepfakes.com sends every request with privacy_mode enabled, so Resemble AI does not persist the text content. We do not store it either.
- Can I call this from my app?
- Yes — the same detector is available via the Resemble AI API. See app.resemble.ai for production access and rate limits.
- Why do I need 50+ characters?
- Short strings are statistically indistinguishable between human and AI text. The minimum keeps false positives out of the public tool.