How to pre-check an essay for Turnitin
- Copy the body of your essay, without the title page and reference list, and paste it into the box above. Turnitin also leaves those parts out of its AI score.
- Click Check for AI. Each detector returns its score within seconds, shown side by side.
- Read the highest score, not the average. Your instructor sees only one report, and you want every detector to read low.
- If any score is above 20%, send the text to the Turnitin humanizer, then check the new version here again.
For a long paper, check it section by section. The weakest section usually holds most of the flagged sentences, and fixing that one part is faster than reworking the whole paper.
What your instructor sees in the Turnitin AI report
Turnitin's AI writing report sits next to the similarity report but works separately from it. It does not look for copied sources. It splits your paper into overlapping segments, scores each sentence on how likely it is to be AI-generated, and shows your instructor one overall percentage with the suspect sentences highlighted.
- A minimum of 300 words. Turnitin only scores long-form prose of at least 300 words. Bullet lists, tables, code and the bibliography do not count toward it.
- Low scores are hidden behind an asterisk. Results between 1% and 19% show as *% instead of a number, because Turnitin treats that range as unreliable. Twenty percent and above shows as a real number with highlights.
- Two kinds of highlights. One color marks text that looks AI-generated. A second color marks text that looks AI-generated and then reworded by a paraphrasing tool.
- Bypasser detection. Since August 2025 Turnitin also flags text that looks like it went through a basic "humanizer" or word spinner. Synonym swaps and odd vocabulary are what give that text away.
The practical target is the same as Turnitin's own line: keep every detector under 20%, so the report shows an asterisk or nothing at all.
How to read your pre-check score
- 0 to 20% everywhere: ready to submit. This is the range Turnitin itself does not put a number on.
- One detector above 20%: look for the paragraphs with stock transitions and evenly sized sentences, rewrite those, and check again.
- Several detectors above 50%: the whole draft reads as AI. Run it through the essay humanizer in Enhanced mode with the Essay purpose, then re-check.
Use at least 300 words per check, the same as Turnitin. Scores on a single short paragraph swing much more than scores on a full section.
What gets an essay flagged
AI detectors, Turnitin included, react to writing that is predictable from one word to the next and uniform from one sentence to the next. In student essays that usually looks like:
- Paragraphs that open with Furthermore, Moreover or Additionally, one after another.
- Stock phrases such as plays a crucial role, in today's world or it is important to note.
- Every paragraph built the same way: claim, three supporting points, a one-line summary.
- A conclusion that repeats the introduction almost word for word.
- Sentences that are all roughly the same length.
Careful human writing can hit these patterns too, especially templated essays and writing by non-native speakers. A pre-check tells you which drafts look that way before anyone else sees them. Keep your notes and earlier drafts as a record of how you wrote the paper.
Fix a high score in a few minutes
If text was pasted from a chat window, run it through the free AI text cleaner first to strip hidden characters, markdown and stray formatting. Then humanize the flagged sections. The rewrite keeps your thesis, the order of your argument and your in-text citations, and changes the rhythm and phrasing that detectors pick up on. Check the result here, read it aloud once, and add a point from your own lecture notes or reading so the paper sounds like you.
Free runs cover 200 words at a time. For full papers, paid plans take 1,000 or 3,000 words per run and raise AI checks to 50 a day.