Direct answer
If you have opened a Turnitin AI writing report and seen a star, or asterisk (*), where you expected a numeric percentage, you are looking at Turnitin's standard way of displaying a very low AI score. According to Turnitin's official AI writing detection FAQs, any AI score below 20% is shown as an asterisk instead of a precise number [1]. In short, the star is good news: it means the overwhelming majority of your document shows little evidence of AI-generated writing. Below, we explain exactly what the star means, whether it counts as a pass, and how to confirm your score before you submit.
What Does the Asterisk (Star) Next to the Turnitin AI Percentage Mean?
The asterisk is a display rule, not a score of its own. Turnitin's official guidance on using the AI writing report explains that the report shows the percentage of the submitted document that may have been generated by AI, and that extremely low percentages are deliberately suppressed [2]. Turnitin withholds single-digit figures because reporting them as precise numbers would overstate the statistical confidence of a very low reading [2].
Practically, the star is a threshold bucket: every AI score below 20% collapses into the same symbol. This means the star does not tell you whether your true score is 3%, 12%, or 19% — it tells you only that your score sits below the 20% line. That conservative approach is intentional, because the detector's low end is not precise enough to quote as an exact percentage.
The star also does not mean your report failed, and it is not a glitch. It is a documented behavior of the AI writing report, and it applies to the AI indicator only [2]. Your similarity score is a separate number with its own color coding (blue, green, yellow, or red) and is unrelated to the star that appears in the AI writing report [2].
Is an Asterisk Score a Pass or a Red Flag on Turnitin?
In practical terms, a star reads as a pass-level outcome: a score below 20% means the document is overwhelmingly likely to have been written by a human. That said, Turnitin is careful to position the AI writing indicator as a conversation starter for review, not as a verdict of academic misconduct [3]. Instructors are explicitly advised not to treat the indicator as a standalone accusation against a student.
That does not make the star a certificate of perfection. Turnitin's own documentation acknowledges that the AI writing indicator is not error-proof and can be influenced by writing style — for example, unusually formulaic prose can sometimes trip a detector [3]. A sub-20% bucket dramatically reduces, but does not completely eliminate, the chance that your work draws a second look.
Context still matters at submission time. The star reflects the overall percentage for the whole document, so even with a star, individual sentences can still match known AI patterns and attract a comment [3]. It is also worth remembering that "below 20%" is a range: your real score could be 0%, 12%, or 19%, and Turnitin only displays an explicit 0% when the score is genuinely zero [3].
How Can I Preview My Turnitin AI Score Before I Submit My Essay?
The only reliable way to know your real Turnitin AI percentage — or to confirm that the star is what your instructor will see — is to run your draft through the same detector used inside institutional systems. Turnitin's published research explains that the AI writing indicator is part of the standard Turnitin workflow that instructors use when grading submissions [4]. Student-facing preview tools that mirror that workflow let you see the same star, score, and flags on your own draft before it ever reaches your school.
Previewing gives you the full picture in advance: the AI writing report (star bucket or numeric score) alongside the similarity report, so there are no surprises on submission day [4]. This is exactly where a service like turnitin0 helps — it returns real Turnitin AI and similarity reports on your document in minutes, matching what your professor would see in their academic system.
If your preview comes back with a numeric score above 20% or heavy sentence-level flags, do not submit as-is. Revise or humanize the flagged passages, then re-check until the report settles into the star range [4]. A star before submission is precisely the outcome you want to see.
The star is exactly the outcome you want before a real submission — it tells you your Turnitin AI score sits below the 20% threshold. But you can only trust that star if it comes from the same detector your instructor uses. turnitin0 gives you a real Turnitin AI writing report and a similarity report on your draft within minutes, so you can confirm the star — or catch a flagged score — before it ever reaches your school.
※ Turnitin0.com - Actual Turnitin AI Report Cover, Score, Flag And Similarity Summary
FAQ
Does the star mean my Turnitin AI score is 0%?
No. The star means your score is below 20%. Only a genuinely zero score displays as an explicit "0%"; everything else under the 20% threshold collapses into the asterisk [1].
Why does Turnitin use an asterisk instead of a number?
Turnitin considers single-digit percentages too statistically unreliable to quote precisely, so it groups all sub-20% scores under one symbol instead of reporting a number it cannot stand behind [2].
Is a star score the same as a similarity score?
No. The asterisk belongs to the AI writing report only. Your similarity report shows its own color-coded percentage and is completely separate from the AI indicator [2].
Can my essay still be flagged even if I get a star?
Yes, in rare cases. The star reflects the overall document percentage, but individual sentences can still match known AI patterns, and instructors may review them even when the overall score is low [3].
How can I see my real Turnitin AI score before submitting?
Run your draft through a Turnitin-based preview service such as turnitin0, which returns the real AI writing report and similarity report in about 10 minutes — the same reports your instructor would see [4].