Direct answer
To check whether text reads as AI-generated, paste or upload it to an AI detector that runs the same detection model your institution uses, then read the resulting percentage as the share of qualifying prose classified as machine-written. Turnitin's AI writing indicator is reported separately from the similarity score, applies only to long-form English prose, and shows an asterisk instead of a number when detection falls below its 20% confidence threshold [1]. Because the indicator is advisory rather than a verdict, the useful question is not only "what score did I get" but "which sentences triggered it and what do I do next."
How Do I Check If My Text Is AI-Generated?
The mechanics matter more than the marketing. Turnitin's AI writing detection is a distinct panel that sits alongside the similarity report, not inside it — a document can score 4% similarity and still carry a high AI indicator, or the reverse [2]. The detector evaluates long-form English prose and reports the proportion of that prose it classifies as AI-generated; reference lists, bibliographies, short-answer responses, and quoted material are excluded from the calculation [2]. That exclusion is why two students can submit near-identical essays and receive very different indicators.
When you run a check, read the output in three layers. First, the headline percentage tells you how much of the assessed prose was flagged. Second, the sentence-level highlighting shows exactly which passages drove the number, so you can judge whether the flags cluster in one paragraph or spread across the whole document [2]. Third, the similarity report tells you whether the same passages also match published sources — a separate integrity question that the AI indicator does not answer [1]. A single number with no highlighting is close to useless for revision.
Practical checks worth running before you trust any tool: confirm it accepts .docx, .pdf, or .txt and that it assesses English documents of meaningful length (very short extracts produce unstable results), and confirm whether the file is added to a student paper database. A non-repository check lets you test a draft repeatedly without polluting future similarity results [1]. If a free checker returns a suspiciously round number with no sentence view, you are looking at a demo, not a diagnostic.
What Does the Turnitin AI Score Actually Mean?
The percentage represents the share of the submitted text that the detection model classifies as AI-generated — nothing more and nothing less [3]. It is not a probability that you cheated, it is not a grade, and it is not evidence on its own. Turnitin itself frames the indicator as one signal an instructor weighs alongside drafting history, in-class writing, and the assignment's stated AI policy [3]. Treating the number as a verdict misreads what the tool was built to do.
The asterisk is the detail students most often misread. When the detected amount falls below Turnitin's 20% confidence threshold, the report displays *% rather than an exact figure, because the underlying signal is too weak to state precisely [3]. An asterisk is a low-confidence result, not a clean bill of health — and it is not a failure either. Conversely, a high percentage can appear on text a student wrote entirely themselves, particularly with formulaic academic phrasing, heavily templated lab reports, or prose that has been through multiple grammar tools [3]. False positives are a documented limitation, not a rumour.
What the score cannot do is distinguish intent. A paragraph drafted by ChatGPT and a paragraph a student wrote and then polished sentence-by-sentence with an AI assistant can land in similar territory, because both may exhibit the low-perplexity, high-uniformity patterns detectors look for [3]. That is why the sentence-level view matters: a flag on three consecutive sentences in your own argument is a different situation from a flag on the whole literature review. Read the highlighting before you read the headline number.
What Should I Do If My Text Gets Flagged as AI?
Start by gathering evidence, not by panicking. Institutions are advised to treat a flag as the opening of a conversation rather than a finding of misconduct, and students who can show version history, notes, outlines, and earlier drafts are in a far stronger position [4]. Most word processors and cloud documents keep revision history automatically — export or screenshot it before you edit anything further, because your defence is the record of how the text evolved.
The substantive remedy is rewriting the flagged passages in your own voice. Turnitin's guidance to educators emphasises that the goal is authentic student writing, and the practical route there is replacing generic phrasing with your own examples, your own data, and your own reasoning about the sources you actually read [4]. Paraphrasing a flagged sentence with a synonym tool rarely helps, because the underlying structural patterns remain. Rewriting the paragraph's logic — its claim, its evidence, its link to your argument — changes what the detector is measuring.
Disclosure is the third lever. If your institution permits AI assistance with attribution, saying so plainly in a methods note or cover statement is far safer than hoping the indicator stays low [4]. Policies differ sharply between departments, so check your module handbook rather than assuming. And if you still hold a draft you have not submitted, the most useful move is to see the report your instructor would see before the deadline rather than after it.
Reading a flag is only half the job — the other half is knowing, before you submit, exactly what your instructor's report will show. That is the gap turnitin0 was built for: an independent pre-submission check that returns the same AI writing and similarity reports, sentence highlighting included, so you can revise the flagged passages while there is still time to revise them.
※ Turnitin0.com - Actual Turnitin AI Report Cover, Score, Flag And Similarity Summary
FAQ
Can I check my text for AI without submitting it to my university?
Yes. A non-repository pre-submission check runs your file without adding it to Turnitin's student paper database, so the draft is not stored for future similarity matches [1]. Confirm that condition before uploading anything you intend to submit.
Is a 0% AI score proof that my writing is human?
No. A low or asterisked result means the detector found little it could classify with confidence, not that the text has been certified as human-written [3]. Detectors measure patterns, and patterns can be inconclusive in either direction.
Why does my report show an asterisk instead of a percentage?
Turnitin displays *% when the detected amount falls below its 20% confidence threshold, because the signal is too weak to report as an exact number [3]. It is a low-confidence reading rather than a pass or a fail.
Does a high AI score mean I will be accused of misconduct?
Not automatically. The indicator is one input an instructor weighs against drafting history, in-class work, and the stated AI policy, and institutions are advised to treat flags as a conversation rather than a conclusion [4].
Will rewriting flagged sentences with synonyms lower the score?
Usually not meaningfully. Detectors respond to structural and stylistic patterns, so the effective fix is rewriting the passage's reasoning and evidence in your own voice rather than swapping words [4].