Turnitin AI Detector: Check Your Text Before You Submit
Paste your writing below to see if it reads as AI-generated — the same kind of signal Turnitin's AI writing indicator reports to your instructor. Know where you stand before you hit submit.
Trusted by 100,000+ writers, students & content teams
Free check · No sign-up · Your text is never stored
Independent tool — not affiliated with Turnitin. No detector result is proof of authorship.
The facts
How Turnitin's AI detection works
Turnitin's AI writing detection runs automatically when an instructor has it enabled. It splits your document into overlapping segments of a few hundred words, scores each sentence for AI-typical patterns, and reports the percentage of qualifying prose it believes was AI-generated. Instructors see this indicator — students usually don't.
It only evaluates long-form English prose (roughly 300+ words) and ignores lists, code, and short answers. Turnitin reports a document-level false-positive rate below 1% at its threshold, but it also acknowledges lower reliability for scores under 20% — and independent reporting has documented human writing being flagged, disproportionately for non-native English speakers.
The practical takeaway: you can't see Turnitin's score before submission — but you can check how your writing reads to AI-detection models in general, and keep evidence of your own work.
How to check your writing before submitting
Paste your draft
Drop your essay or assignment into the checker above. Nothing is stored.
Read the verdict honestly
A high AI score on genuinely-your-own writing means it reads as formulaic — revise for specific detail and your own voice, and it will read as human because it is.
Keep your evidence
Save drafting history (Google Docs version history, notes, sources). If a detector ever flags your genuine work, your process is the strongest proof you have.
Frequently Asked Questions
Yes — detecting text from ChatGPT and similar models is exactly what Turnitin's AI writing indicator is built for, and it is most reliable on long, unedited AI prose. Its coverage of newer models keeps being updated.
Turnitin reports a document-level false-positive rate below 1% at its scoring threshold, and flags that scores under 20% are less reliable. Independent tests have found both misses and false positives — which is why no serious institution treats the score alone as proof.
Yes, in both directions. Human writing — especially formulaic academic prose and writing by non-native English speakers — is sometimes flagged, and edited AI text is sometimes missed. Turnitin itself tells institutions the indicator is a signal for conversation, not a verdict.
Usually not. The AI writing indicator appears in the instructor's Similarity Report view; most institutions don't expose it to students. That's why checking how your text reads before submission has to happen outside Turnitin — for example with the free checker on this page.
No. Turnitin does not offer a public self-check tool. This is an independent AI detector: it tells you how your writing reads to AI-detection models in general, which is the best available signal before you submit.
Don't panic — talk to your instructor and bring your process: version history, outlines, notes, and sources. Institutions know detectors produce false positives, and documented drafting history is the strongest evidence there is.
Keep exploring
Which AI Detector Does Turnitin Use?
What's actually behind Turnitin's AI writing indicator
GPTZero vs Turnitin
How the two best-known academic AI detectors compare
Grammarly AI Detector
Free check plus our 2026 accuracy test of Grammarly's detector
AI Detector
Our full AI detector — check any text against 7+ models
Check your writing now — free
Know how your text reads before your instructor does. No sign-up, no storage.
Check my text
