Free AI Text Detector
Paste any text. Essay, blog post, email, ChatGPT output. Get an instant AI-likelihood score in under a second.
How to read the score
What this detector actually measures
Perplexity
How predictable each next word is given context. AI text has very low perplexity (smooth, predictable).
Burstiness
Variation in sentence length. AI writes uniformly; humans mix 4-word punches with 40-word flowing sentences.
Hedge phrases
"It is important to note", "leveraging", "comprehensively", "in conclusion". AI hedge fingerprints scored heavily.
Same signals used by GPTZero and Turnitin Originality. This tool is a fast first-pass check. For high-stakes submissions, also run your text through your institution's official detector.
Got a high score? Here's the fix.
The SAAF AI humanizer rewrites text to flatten the perplexity and burstiness patterns this detector reads as AI. 86% of texts pass Turnitin and GPTZero on Strong mode after a single pass. Free tier handles 200 words/run.
Lower this score with SAAF AI · $0 free →No signup · No card · 3 free uses daily
Privacy: Your text is processed in memory and discarded immediately. We never log, store, or share your content. No account required to use this tool.
We built SAAF AI because honest essays were getting flagged as AI. In India and abroad. And the existing humanizers on the market were mostly word-swap tools that don't actually beat the detectors. So we rebuilt the approach: perplexity and burstiness restructuring, not synonym shuffling. Don't take our word for it. Paste your own ChatGPT text into the free tier and run the output through GPTZero or Turnitin yourself. If it doesn't work, email us and tell us why.
Frequently asked questions
How does this free AI detector work?
It scores text on signals that AI detectors like GPTZero and Turnitin look at. Perplexity (word predictability), burstiness (sentence-length variation), and known AI hedge phrases. The score is on a 0–100 scale where higher means more likely AI-generated. It is a fast estimate, not a forensic verdict.
Is it really free? Do I need to sign up?
Yes, free. No signup, no card, no email required. Paste your text, get a score. If your score is high and you want to fix it, the SAAF AI humanizer is one click away. Also with a free tier.
How accurate is the score compared to GPTZero or Turnitin?
It correlates strongly with GPTZero on smooth AI-generated text and is calibrated against patterns Turnitin Originality is known to flag. For high-stakes academic submissions, run your text through the official Turnitin or GPTZero report your institution uses; treat this tool as a fast first pass.
My honest essay scored as AI. What should I do?
AI detectors have a known 4–9% false-positive rate on human-written text, especially for non-native English writers (Liang et al., Stanford 2023). If you wrote it yourself, keep your version history (Google Docs revision log) as evidence and consider running the text through SAAF AI as a precaution before submission. The output has different statistical patterns and is unlikely to be falsely flagged.
My ChatGPT text scored as AI. What should I do?
Run it through SAAF AI. Paste the same text into the SAAF AI humanizer (free tier handles 200 words at a time, no signup), pick Academic or your relevant tone, and the output will typically drop the AI score below 10% on the same detector signals.
Do you store my pasted text?
No. Text is processed in memory and discarded immediately. We never log, store, or share your content. The score is computed and returned; nothing is retained.
Will this detect Claude, Gemini, Llama text too?
Yes. The detector signals (perplexity, burstiness, hedge phrases) are properties of the output text itself, not the source model. ChatGPT, Claude, Gemini, Llama, Copilot, and other LLMs produce text with similar statistical fingerprints, all of which score high on this tool.
Comparing other tools too?
Need to fix the score, not just check it?
SAAF AI rewrites text to pass Turnitin and GPTZero. Free tier, no signup.
Try SAAF AI Free →3 free uses daily · 200 words each · No card