Free AI detector
Paste any text to see how human it reads: a score, the signals behind it, and the sentences that sound most like AI.
Want it to read more human? Try the humanizer.
What the score means
Reads as human
The text has the variety and small quirks people leave in their writing.
Mixed
Parts read as AI. Often an edited AI draft, or very formal human writing.
Reads as AI
The even rhythm and word choice typical of AI models.
About the AI detector
Something else? Write to [email protected].
How does the AI detector work?
It measures habits that separate AI writing from human writing: how much sentence length varies, punctuation, common AI words and phrases, contractions, linking words and more. A model trained on thousands of human and AI texts turns these into one score.
Is it free?
Yes. Check up to 1,500 words at a time here without an account. Inside SerpPal there is no word limit and you also get an optional AI second opinion.
How accurate is it?
On texts it never saw in training it separates AI and human writing well, but no detector can prove who wrote a text. Use the score to find sentences worth rewriting, not as proof.
Do you store my text?
No. Text checked on this page is analyzed and discarded. It is not saved or used for training.
Fix the sentences that sound like AI
The humanizer rewrites them in a natural voice and keeps every fact.