Turnitin AI Report with Highlighted Passages

Turnitin's AI writing report uses a color-coded highlighting system to mark individual sentences that its detection model predicts were written by an AI tool. When a paper is submitted, Turnitin breaks the text into overlapping segments of roughly five to ten sentences, then runs each segment through its AI detection model. Each sentence receives a score between 0 and 1, where 0 means the model predicts human authorship and 1 means it predicts the sentence was entirely generated by AI [1]. Sentences with high AI-prediction scores are then visually flagged in the report.

The report features an interactive submission breakdown bar at the top of the page. This bar provides a page-by-page visual overview of where AI writing has been detected across the document. Instructors can click on any colored section of the bar to jump directly to the corresponding highlighted passage on that page [2]. The highlighting itself appears directly over the text inside the submitted document, allowing side-by-side comparison with the student's original writing.

Two distinct highlight colors appear in the report. Cyan (blue-green) highlighting marks sentences that Turnitin identifies as "AI-generated only"—text that was likely produced directly by a large language model (LLM) such as GPT-4, Claude, or Gemini. Purple highlighting marks sentences that the model identifies as "AI-generated and then AI-paraphrased"—meaning the original AI output was likely modified using a paraphrasing tool like Quillbot or a bypasser tool [2]. This dual-color system helps instructors distinguish between raw AI generation and AI text that has been further altered. Importantly, the AI writing highlights are separate from the Similarity Report and are only visible within the AI Writing Report interface, not overlaid on the standard similarity matches [2].

Highlighted passages in a Turnitin AI report are indicators, not definitive proof of academic misconduct. Turnitin explicitly advises that its AI detection output should never be used as the sole basis for an adverse academic decision, because false positives—incorrectly flagging human-written text as AI-generated—are a known possibility [1]. The highlighted passages simply represent sentences that the model's statistical analysis has identified as exhibiting patterns consistent with AI-generated text.

The percentage displayed at the top of the report shows the proportion of qualifying text (prose sentences in long-form writing format) that the model predicts as AI-generated. However, there is a critical nuance: for scores between 1% and 19%, Turnitin now suppresses the numeric percentage and instead displays an asterisk (*%) [2]. This design choice was made to reduce the risk of misinterpretation, as the company's testing found a higher incidence of false positives in this low range. So if you see an asterisk instead of a number, the detection is below 20% and less reliable. Only scores of 0% (no detection) or 20% and above are shown numerically [2].

The highlighting also reflects the model's confidence at the sentence level, not just the document level. A student may see highlighted sentences even when the overall percentage is relatively low, because individual flagged sentences can still appear while the majority of the document remains unflagged [2]. This means the presence of some highlighted passages does not automatically indicate widespread AI use—context and proportion matter greatly. Additionally, Turnitin's model does not detect non-prose content such as poetry, bullet points, tables, code, or annotated bibliographies, which is why a document containing mixed writing types may show a disparity between the percentage and the amount of highlighted text [2].

For students who want to see what highlighted passages would appear in their Turnitin AI report before submitting to an instructor, the options depend on their institution's configuration. Turnitin's Draft Coach tool, available through Google Docs and Microsoft Word, allows students at participating institutions to run similarity checks before submission, though its AI highlight preview capabilities may be limited [4]. When Draft Coach is unavailable, the only way to preview the report is through instructor-managed assignment resubmissions—and even then, students typically see the Similarity Report, not the full AI Writing Report with highlighted passages.

This is precisely why many students turn to independent pre-submission checking services. By uploading a draft to a Turnitin-based checking service before the official submission, students can see the exact AI writing report—including every cyan and purple highlighted passage—that their instructor would later see. The report preview reveals which specific sentences triggered the AI flag, the overall AI percentage, and the breakdown between AI-generated and AI-paraphrased detection [3]. This pre-submission knowledge is invaluable because it allows students to identify problematic sections, understand how the detector interprets their writing style, and make informed revisions before the paper reaches their instructor.

The ability to preview highlighted passages before submission also helps students who write in a hybrid manner—using AI for brainstorming or outlines but writing the final content themselves. Turnitin's model can sometimes flag sentences that are simply well-structured or follow conventional academic patterns, which can produce false highlights in otherwise original work [1]. Previewing the report gives these students the opportunity to review flagged sections and, if needed, rewrite them in their own voice to ensure the final submission reflects their genuine work. Ultimately, seeing the highlighted passages before submission empowers students to take control of their academic integrity proactively rather than reactively.

Turnitin0 gives you the power to see exactly what your Turnitin AI report looks like—complete with every highlighted passage in cyan and purple—before you ever hit submit. Instead of wondering which sentences might be flagged or waiting anxiously for your instructor's feedback, you can upload your draft and receive a genuine Turnitin AI writing report that mirrors what your institution uses. With over 100,000 reports delivered and 20,000+ students served, Turnitin0 is the most trusted way to preview your AI report highlights, understand your score, and make revisions with confidence.

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