Direct answer
Direct Answer - No, Turnitin's standard submission reports do not check grammar. The similarity and AI writing reports focus on plagiarism (matching your text against academic and web databases) and AI-generated writing, not on spelling, punctuation, or sentence-level grammar errors. Grammar feedback exists only in a separate product, Turnitin Draft Coach, which works inside Google Docs and Microsoft Word and is not part of the report your instructor sees at submission [1].
What Does Turnitin Actually Detect in Submitted Papers?
Turnitin's core submission product is built around two reports: the similarity report and the AI writing report. The similarity report compares your paper against a large database of published scholarship, previously submitted student papers, and web content, then produces a percentage score and highlights matching passages [2].
The AI writing report, available alongside similarity, flags passages that are likely to have been generated by AI tools such as ChatGPT [2]. Neither report evaluates writing mechanics such as verb tense, subject-verb agreement, punctuation, or comma usage, because Turnitin is designed to measure originality and provenance, not prose quality.
In practical terms, when your instructor opens your submission in Turnitin, they see a similarity percentage, AI detection highlights, and source matches—not a grammar score. If grammar is part of your assignment rubric, it is assessed by your instructor or by a separate proofreading tool, not by the Turnitin report itself.
Does Turnitin Grammar Checking Work Like Grammarly or Other Proofreaders?
Turnitin does offer grammar support, but only through Turnitin Draft Coach, an add-on that runs inside Google Docs and Microsoft Word [3]. Draft Coach checks grammar, spelling, punctuation, and citation mechanics as you write, which sounds similar in spirit to Grammarly or other proofreaders.
The key difference is that Draft Coach is an optional, opt-in writing aid for students, while the similarity and AI reports are generated automatically when work is submitted through the institutional workflow [3]. These are separate experiences that never merge into a single grammar score.
So if your real question is whether submitting through Turnitin will surface your grammar mistakes to your instructor, the answer is no. Grammar checking is a separate, voluntary feature that does not appear in the report your instructor reviews, and it should not be confused with the plagiarism or AI detection that Turnitin is actually known for.
How Can You Preview Your Turnitin AI and Similarity Scores Before Submitting?
Because grammar is not part of the Turnitin report, the scores that actually matter before you submit are similarity and AI writing. Turnitin's AI detector estimates the percentage of a document that appears to be machine-generated, and instructors routinely consider that percentage alongside the similarity score when reviewing student work [4].
Students increasingly want to see these two numbers on their own draft before the official submission, since a high AI percentage or a high similarity match can trigger academic-integrity conversations that are difficult to undo after the fact [4].
Previewing your own report in advance lets you identify flagged passages and address them while you still control the document—especially if you used AI tools for drafting, polishing, or light editing, because even modest AI assistance can leave detectable patterns in the text.
Before you submit, it helps to see exactly what your instructor will see: the similarity percentage, the AI writing score, and the highlighted matches. turnitin0 lets you run a real Turnitin AI and similarity report on your own draft first, so you can confirm whether grammar is the only thing left to fix or whether similarity and AI flags still need attention before you hand your paper in.
※ Turnitin0.com - Actual Turnitin AI Report Cover, Score, Flag And Similarity Summary
FAQ
Does Turnitin check spelling and grammar in submitted essays?
No. The similarity and AI writing reports do not scan for spelling, punctuation, or grammar errors. Grammar checking is handled by a separate product, Turnitin Draft Coach, which students must actively use while writing in Google Docs or Microsoft Word [1].
Will my instructor see grammar errors in my Turnitin report?
No. Your instructor sees only the similarity score, AI writing percentage, and highlighted matches. Grammar issues are not reported or flagged inside the Turnitin submission report [2].
What exactly shows up in a Turnitin similarity report?
The similarity report shows an overall percentage of text matching other sources, a breakdown by source type, and highlighted passages linked to their matching sources. It is designed to measure originality, not writing quality [2].
Does Turnitin flag AI-written text?
Yes. Turnitin's AI writing report estimates the percentage of a document that appears to be generated by AI tools, and instructors can see exactly which passages were flagged [4].
How is Turnitin Draft Coach different from the normal Turnitin check?
Draft Coach is an opt-in writing aid that provides grammar, spelling, and citation feedback as you write in Google Docs or Microsoft Word. The standard Turnitin submission check produces similarity and AI reports only, with no grammar component [1][3].