Free AI Detector
Paste your text and see which sentences may be flagged as AI-written – before your professor's checker does. A free alternative to the Grammarly AI detector.
Free · No sign-up · Your text is not stored
How it works
Step 1
Paste your text
Essays, assignments, cover letters – anything over 40 words.
Step 2
See the score
An overall AI probability plus a verdict you can understand.
Step 3
Fix flagged sentences
Highlights show exactly which sentences may trigger a detector.
A free alternative to the Grammarly AI detector
Schools and teachers use tools like Turnitin, GPTZero and the Grammarly AI detector to flag AI-written work. The problem: these checkers sometimes flag text that a student wrote entirely by themselves. Detectize lets you run the same kind of check on your own work first, see which sentences look AI-like, and revise them before you hand anything in.
Frequently asked questions
Is this the official Grammarly AI detector?
No. Detectize is an independent, free alternative. We are not affiliated with Grammarly. Use it as a second opinion before you submit your work.
Will my professor know if I check my essay here first?
No. We don't submit your text to any school database and we don't store it after the check. Pre-checking your own writing is a normal part of proofreading.
Why does my human-written essay show as AI?
AI detectors look for predictable wording and uniform sentence length. Formal, polished or non-native English can trigger false positives. The sentence highlights show exactly which parts to review.
How accurate is an AI detector?
No AI detector is 100% accurate – including the ones schools use. Treat any score as an estimate, not proof. That's why we show sentence-level detail instead of just one number.
Is it free?
Yes. You can check up to 1500 words per scan for free, with no sign-up.