Two different reports
Turnitin produces two separate things: the Similarity Report (matches against web pages, journals and earlier submissions) and the AI writing indicator (an estimate of how much of the prose looks machine-generated). A high similarity score does not mean AI was used, and a high AI score does not mean you copied anyone. Your institution decides whether instructors can see the AI indicator at all.
What the AI indicator shows
- An overall percentage of qualifying text that the model believes is AI-generated, split into "AI-generated only" and "AI-generated text that was AI-paraphrased".
- Results between 1% and 19% are not shown as a number. They appear as *%, because Turnitin accepts that low scores are where false positives are most likely.
- Very short submissions (roughly under 300 words) give less reliable results. Long-form prose is what the model is built for; tables, bullet lists, code and references are generally not scored.
- Since 2025 Turnitin also looks for text altered by "AI bypasser" and word-spinner tools, so running AI text through a paraphraser is more likely to be flagged, not less.
Why genuine writing sometimes gets flagged
Formulaic academic English (standard literature-review phrasing, textbook definitions, very uniform sentence length) can look statistically similar to AI output. Students writing in a second language and those who rely heavily on grammar tools are more exposed. A false positive is possible, which is exactly why the score is meant to start a conversation rather than end one.
If your own work is flagged
- Stay calm and ask to see the report. Note which passages are highlighted.
- Gather evidence of your process: Google Docs or Word version history, notes, outlines, earlier drafts, data files and supervisor emails.
- Offer to explain your work orally. Being able to discuss your argument and sources is the strongest proof of authorship.
- Read your institution's AI policy. Many allow AI for brainstorming or grammar but not for drafting; follow what yours says and disclose any permitted use.
We do not offer anything designed to hide AI use or "beat" a detector. What we can do is provide a pre-submission AI and similarity report so you know what your instructor will see, and help you edit your own draft for clarity and correct citation.
More answers: similarity and AI reports FAQ · report pricing
This guide is general information. Always follow your own university's current regulations and your supervisor's advice.